Ribblu.com has a greater community of parents & students. JustAsk is an education platform where you can help others to find answers of any question. Share your Knowledge. Answer questions and become an expert..
give the meaning of work force
define worker population ratio
who is casual wage laborer
how will you know whether a worker is worker in the informal sector
why are regular salaried employees more in urban areas than in rural areas
why do we diffrentiate between economic activity and production activity
what are fluids give examples
solids are rigid why
how are solids classified
why do crystalline solids are anisotropic nature and amorphous solid are isotropic in nature
why do crystalline solids are anisotropic nature and amorphous solid are isotropic in nature 1
define the term crystal lattice
what is a unit cell
what is square close packing
define a void b coordination number
what is the packing efficiency in
what is the meaning of term defect with reference to crystal
name the types of point defect
what are f centres
give an example which shows both frenkel and schottky defect
define the term doping
what is the meaning of 13 15 compounds
name an element which can be added to silicon to give a i p type semiconductor ii n type semiconductor
what is the difference between ferromagnetic and paramagnetic substances
the window panes of the old buildings are thick at the bottom why
the stability of a crystal is reflected in the magnitude of its melting point explain
graphite is soft and good conductor of electricity explain
ionic solids are good conductors in molten state and in aqueous solutions but not in solid state why
name three types of cubic unit cells
what is the no of octahedral and tetrahedral voids present in a lattice
define two main types of defects
excess of lithium makes licl crystal pink explain
define the terms intrinsic semiconductor and extrinsic semiconductor
give two application of p type and n type semiconductors
classify each of the following as being either a p type or an n type semiconductor i ge doped with in ii b doped with si
define the term amorphous give a few examples of amorphous solids
what makes a glass different from a solid such as quartz under what conditions could quartz be converted into glass
how are crystalline solids classified on the basis of nature of bonding explain with examples
stability of a crystal is reflected in the magnitude of its melting point comment collect melting
points of solid water ethyl alcohol diethyl ether and methane from a data book what can you say about the intermolecular forces between these molecules
explain the schottky defect terms with suitable examples
explain the frenkel defect terms with suitable examples
explain the interstitials terms with suitable examples
explain the f centres terms with suitable examples
define the term solubility
what is the effect of pressure on solubility of a gas
state henrys law
state raoults law
what are the factors on which vapour pressure depends
the vapour pressure of solvent gets lowered when a non volatile solute is added to it why
name two ways by which vapour pressure of a liquid can be lowered
definesolution
how does change in temperature changes the molarity and molality values
define the term colligative properties
what are the possible deviations from ideal behaviors
give one example of each deviation
how much urea molar mass 60 gmol should be dissolved in 50g of water so that its vapour pressure at room temperature is reduced by 25
why is the boiling point elevated when a non volatile solute is dissolved in a liquid
what happens when red blood cells are placed in 01 nacl solution
how is osmotic pressure of a solution related to its concentration
when does the measurement of colligative property leads to abnormal molecular mass
when is the value of i less then unity
what role does the molecular interaction play in a solution of alcohol and water
give an example of solid solution in which the solute is a gas
define the term azeotrope
define the term solution how many types of solutions are formed write briefly about each type with an example
can you store agcl solution in zinc pot
define the term standard electrode potential
can an electrochemical cell act as electrolytic cell how
single electrode potential cannot be determined why
what is she what is its electrode potential
what is an electrochemical series how does it predict the feasibility of a certain redox reaction
give some uses of electrochemical cells
state the factors that affect the value of electrode potential
state kohlrauschs law
what is meant by faradays constant
why is the voltage of a mercury cell constant during its working
what are fuel cells
what do you understand by corrosion
name two metals that can be used for cathodic protection of iron
arrange the following metals in the order in which they displace each other from the solution of their salts al cu fe mg and zn
suggest two materials other than hydrogen that can be used as fuels in fuel cells
suggest a list of metals that are extracted electrolytically
what are the factors on which conductivity of an electrolyte depend
the conductivity of metals decreases while that of electrolytes increases with increases in temperature why
state faradays laws of electrolysis
silver is deposited on a metallic vessel by passing a current of 02 amps for 3 hrs calculate the weight of silver deposited at mass of silver 108 amu f 96500 c
what do you mean by primary and secondary battery
rusting of iron is quicker in saline water than in ordinary water explain
why does the conductivity of a solution decrease with dilution
is rate of reaction always constant
can order of reaction be zero give example
what do you understand by rate law expression
is it possible to determine or predict the rate law theoretically by merely looking at the equation
define the term chemical kinetics
define rate of reaction and the factors affecting the rate of reaction
what is the effect of catalyst on rate constant
how is activation energy affected on adding a catalyst
what do you mean by the term collision frequency
what is the drawback of collision theory
how does the number of collisions change on increasing the temperature
there is no bar on the no of collisions among the reaching species why most of the reactions do not take place under normal conditions
define the terms i order of a reaction ii molecularity of a reaction
what are elementary and complex reactions
in the expression of rate of reaction in terms of reactants what is the significance of negative sign
what is the use of integrated rate equation
how does collision theory explain formation of products in a chemical reaction
mention the factors that affect the rate of a chemical reaction
what do you mean by the term adsorption
why do finely divided solids act as good adsorbents
name the factors which influence the extent of adsorption of a gas on solid
what is adsorption isotherm
what are positive and negative catalysts explain
what do you mean by the term promoter give an example
what is the optimum temperature and ph for enzyme catalysed reactions
what are colloids
what is the range of particle size in colloids
give two examples of solid sol and gel
colloid is a state not a substance explain
state hardy schulze rule
what is a protective colloid
what is flocculation
what is the role of desorption in the process of catalysis
what is demulsification name two demulsifiers
why do the solution of organic dye turns colourless when charcoal is added
define the term desorption
name the two types of adsorptions
adsorption is an exothermic process explain
explain the mechanism of adsorption
define the terms catalysis and catalyst
what is meant by activity and selectivity of a catalyst
what is shape selective catalysis give an example of shape selective catalyst
write characteristics of enzyme catalysed reactions
give two examples of reactions catalysed by zeolites
what are associated colloids give an example
what is cmc and krafts temperature
define the term peptization
how is a colloidal solution purified by dialysis
what is observed when light is passed through a colloidal solution
define the terms a brownian movement b electrophoresis
give three applications of colloidal solutions
what are the two types of emulsions
how does an emulsifying agent work give an example of emulsifying agent
write any two characteristics of chemisorption
why does physisorption decrease with the increase of temperature
why are powdered substances more effective adsorbents than their crystalline forms
what modification can you suggest in the hardy schulze law
why is it essential to wash the precipitate with water before estimating it quantitatively
give reason why a finely divided substance is more effective as an adsorbent
what do you understand by activation of adsorbent how is it achieved
discuss the effect of pressure and temperature on the adsorption of gases on solids
what are emulsions what are their different types give example of each type
describe some features of catalysis by zeolites
what is shape selective catalysis
give four uses of emulsions
comment on the statement that colloid is not a substance but a state of substance
explain modern theory of heterogeneous catalysis
distinguish between the meaning of the terms adsorption and absorption give one example of each
explain the terms with suitable examples i alcosol ii aerosol iii hydrosol
what role does adsorption play in heterogeneous catalysis
what are lyophilic and lyophobic sols give one example of each type why are hydrophobic sols easily coagulated
what is the difference between multimolecular and macromolecular colloids give one example of each how are associated colloids different from these two types of colloids
what is pig iron
what is cast iron
what is wrought iron
what is added as flux in extraction of iron
why is cryolite used during extraction of aluminum
how is copper extracted from low grade ores
state one limitation of ellingham diagrams
give an example of extraction based on oxidation reduction
which method is used for refining of silicon or gallium
what is the principle behind zone refining
give the requirements for vapour phase refining
name the common elements present in the anode mud in electrolytic refining of copper why are they so present
what is meant by the term chromatography
what criterion is followed for the selection of the stationary phase in chromatography
how is cast iron different from pig iron
what is the principle behind chromatography name some types of chromatographic techniques
write the elements of group 15
the atomic radii increases considerably from n to p but very little increase is observed from as to bi why
give reason for the following the first ionization enthalpy of 15th group elements is higher than 16th group elements
what are the common oxidation states of this group
what is the maximum covalence shown by n
bi v is a stronger oxidizing agent than biiii why
ammonia is a lewis base why
ammonia has higher boiling and melting points than expected why
write two uses of chlorine
write the characteristics of pure ozone
at what concentration ozone is harmful
which aerosols and oxides deplete ozone layer
write the members of 16 group
enlist some uses of dioxygen
which of the following does not react with oxygen directly zn ti pt fe
explain why fluorine forms only one oxoacid hof
write two uses of dinitrogen
why are pentahalides more covalent than trihalides
give two examples to show the anomalous behaviour of fluorine
why is helium used in diving apparatus
why does nitrogen show catenation properties less than phosphorus
which aerosols deplete ozone
explain why inspite of nearly the same electronegativity oxygen forms hydrogen bonding while chlorine does not
why are halogens coloured
why do noble gases have comparatively large atomic sizes
list the uses of neon and argon gases
what are the factors that decide the ionization potential
name the two series of f block
the chemistry of actionoids is more complicated than lanthanoids why
what is the most common oxidation state of lanthanoids and actionoids
actionoid contraction is more than lanthanoid contraction give reason
what is the composition of mischmetall give its one use
actionoids show larger number of oxidation states than lanthanoids why
give an explanation for the catalytic properties shown by transition metals
write some characteristics of interstitial compounds
what is the lanthanoid contraction what are its causes and consequences
why is the highest oxidation state of a metal exhibited in its oxide or fluoride only
actinoid contraction is greater from element to element than lanthanoid contraction why
what is lanthanoid contraction what are the consequences of lanthanoid contraction
what are the characteristics of the transition elements and why are they called transition elements which of the d block elements may not be regarded as the transition elements
what are the different oxidation states exhibited by the lanthanoids
what are interstitial compounds why are such compounds well known for transition metals
what are alloys name an important alloy which contains some of the lanthanoid metals mention its uses
what are inner transition elements decide which of the following atomic numbers are the atomic numbers of the inner transition elements 29 59 74 95 102 104
the chemistry of the actinoid elements is not so smooth as that of the lanthanoids justify this statement by giving some examples from the oxidation state of these elements
what do you understand by stability of a complex and instability constant of coordination compounds
how is excess of copper and iron removed from body
explain the schottky defect terms with suitable examples
explain the frenkel defect terms with suitable examples
explain the interstitials terms with suitable examples
explain the f centres terms with suitable examples
define the term solubility
what is the effect of pressure on solubility of a gas
state henrys law
state raoults law
what are the factors on which vapour pressure depends
the vapour pressure of solvent gets lowered when a non volatile solute is added to it why
name two ways by which vapour pressure of a liquid can be lowered
definesolution
how does change in temperature changes the molarity and molality values
define the term colligative properties
what are the possible deviations from ideal behaviors
give one example of each deviation
how much urea molar mass 60 gmol should be dissolved in 50g of water so that its vapour pressure at room temperature is reduced by 25
why is the boiling point elevated when a non volatile solute is dissolved in a liquid
what happens when red blood cells are placed in 01 nacl solution
how is osmotic pressure of a solution related to its concentration
when does the measurement of colligative property leads to abnormal molecular mass
when is the value of i less then unity
what role does the molecular interaction play in a solution of alcohol and water
give an example of solid solution in which the solute is a gas
define the term azeotrope
define the term solution how many types of solutions are formed write briefly about each type with an example
can you store agcl solution in zinc pot
define the term standard electrode potential
can an electrochemical cell act as electrolytic cell how
single electrode potential cannot be determined why
what is she what is its electrode potential
what is an electrochemical series how does it predict the feasibility of a certain redox reaction
give some uses of electrochemical cells
state the factors that affect the value of electrode potential
state kohlrauschs law
what is meant by faradays constant
why is the voltage of a mercury cell constant during its working
what are fuel cells
what do you understand by corrosion
name two metals that can be used for cathodic protection of iron
arrange the following metals in the order in which they displace each other from the solution of their salts al cu fe mg and zn
suggest two materials other than hydrogen that can be used as fuels in fuel cells
suggest a list of metals that are extracted electrolytically
what are the factors on which conductivity of an electrolyte depend
the conductivity of metals decreases while that of electrolytes increases with increases in temperature why
state faradays laws of electrolysis
silver is deposited on a metallic vessel by passing a current of 02 amps for 3 hrs calculate the weight of silver deposited at mass of silver 108 amu f 96500 c
what do you mean by primary and secondary battery
rusting of iron is quicker in saline water than in ordinary water explain
why does the conductivity of a solution decrease with dilution
is rate of reaction always constant
can order of reaction be zero give example
what do you understand by rate law expression
is it possible to determine or predict the rate law theoretically by merely looking at the equation
define the term chemical kinetics
define rate of reaction and the factors affecting the rate of reaction
what is the effect of catalyst on rate constant
how is activation energy affected on adding a catalyst
what do you mean by the term collision frequency
what is the drawback of collision theory
how does the number of collisions change on increasing the temperature
there is no bar on the no of collisions among the reaching species why most of the reactions do not take place under normal conditions
define the terms i order of a reaction ii molecularity of a reaction
what are elementary and complex reactions
in the expression of rate of reaction in terms of reactants what is the significance of negative sign
what is the use of integrated rate equation
how does collision theory explain formation of products in a chemical reaction
mention the factors that affect the rate of a chemical reaction
what do you mean by the term adsorption
why do finely divided solids act as good adsorbents
name the factors which influence the extent of adsorption of a gas on solid
what is adsorption isotherm
what are positive and negative catalysts explain
what do you mean by the term promoter give an example
what is the optimum temperature and ph for enzyme catalysed reactions
what are colloids
what is the range of particle size in colloids
give two examples of solid sol and gel
colloid is a state not a substance explain
state hardy schulze rule
what is a protective colloid
what is flocculation
what is the role of desorption in the process of catalysis
what is demulsification name two demulsifiers
why do the solution of organic dye turns colourless when charcoal is added
define the term desorption
name the two types of adsorptions
adsorption is an exothermic process explain
explain the mechanism of adsorption
define the terms catalysis and catalyst
what is meant by activity and selectivity of a catalyst
what is shape selective catalysis give an example of shape selective catalyst
write characteristics of enzyme catalysed reactions
give two examples of reactions catalysed by zeolites
what are associated colloids give an example
what is cmc and krafts temperature
define the term peptization
how is a colloidal solution purified by dialysis
what is observed when light is passed through a colloidal solution
define the terms a brownian movement b electrophoresis
give three applications of colloidal solutions
what are the two types of emulsions
how does an emulsifying agent work give an example of emulsifying agent
write any two characteristics of chemisorption
why does physisorption decrease with the increase of temperature
why are powdered substances more effective adsorbents than their crystalline forms
what modification can you suggest in the hardy schulze law
why is it essential to wash the precipitate with water before estimating it quantitatively
give reason why a finely divided substance is more effective as an adsorbent
what do you understand by activation of adsorbent how is it achieved
discuss the effect of pressure and temperature on the adsorption of gases on solids
what are emulsions what are their different types give example of each type
describe some features of catalysis by zeolites
what is shape selective catalysis
give four uses of emulsions
comment on the statement that colloid is not a substance but a state of substance
explain modern theory of heterogeneous catalysis
distinguish between the meaning of the terms adsorption and absorption give one example of each
explain the terms with suitable examples i alcosol ii aerosol iii hydrosol
what role does adsorption play in heterogeneous catalysis
what are lyophilic and lyophobic sols give one example of each type why are hydrophobic sols easily coagulated
what is the difference between multimolecular and macromolecular colloids give one example of each how are associated colloids different from these two types of colloids
what is pig iron
what is cast iron
what is wrought iron
what is added as flux in extraction of iron
why is cryolite used during extraction of aluminum
how is copper extracted from low grade ores
state one limitation of ellingham diagrams
give an example of extraction based on oxidation reduction
which method is used for refining of silicon or gallium
what is the principle behind zone refining
give the requirements for vapour phase refining
name the common elements present in the anode mud in electrolytic refining of copper why are they so present
what is meant by the term chromatography
what criterion is followed for the selection of the stationary phase in chromatography
how is cast iron different from pig iron
what is the principle behind chromatography name some types of chromatographic techniques
write the elements of group 15
the atomic radii increases considerably from n to p but very little increase is observed from as to bi why
give reason for the following the first ionization enthalpy of 15th group elements is higher than 16th group elements
what are the common oxidation states of this group
what is the maximum covalence shown by n
bi v is a stronger oxidizing agent than biiii why
ammonia is a lewis base why
ammonia has higher boiling and melting points than expected why
write two uses of chlorine
write the characteristics of pure ozone
at what concentration ozone is harmful
which aerosols and oxides deplete ozone layer
write the members of 16 group
enlist some uses of dioxygen
which of the following does not react with oxygen directly zn ti pt fe
explain why fluorine forms only one oxoacid hof
write two uses of dinitrogen
why are pentahalides more covalent than trihalides
give two examples to show the anomalous behaviour of fluorine
why is helium used in diving apparatus
why does nitrogen show catenation properties less than phosphorus
which aerosols deplete ozone
explain why inspite of nearly the same electronegativity oxygen forms hydrogen bonding while chlorine does not
why are halogens coloured
why do noble gases have comparatively large atomic sizes
list the uses of neon and argon gases
what are the factors that decide the ionization potential
name the two series of f block
the chemistry of actionoids is more complicated than lanthanoids why
what is the most common oxidation state of lanthanoids and actionoids
actionoid contraction is more than lanthanoid contraction give reason
what is the composition of mischmetall give its one use
actionoids show larger number of oxidation states than lanthanoids why
give an explanation for the catalytic properties shown by transition metals
write some characteristics of interstitial compounds
what is the lanthanoid contraction what are its causes and consequences
why is the highest oxidation state of a metal exhibited in its oxide or fluoride only
actinoid contraction is greater from element to element than lanthanoid contraction why
what is lanthanoid contraction what are the consequences of lanthanoid contraction
what are the characteristics of the transition elements and why are they called transition elements which of the d block elements may not be regarded as the transition elements
what are the different oxidation states exhibited by the lanthanoids
what are interstitial compounds why are such compounds well known for transition metals
what are alloys name an important alloy which contains some of the lanthanoid metals mention its uses
what are inner transition elements decide which of the following atomic numbers are the atomic numbers of the inner transition elements 29 59 74 95 102 104
the chemistry of the actinoid elements is not so smooth as that of the lanthanoids justify this statement by giving some examples from the oxidation state of these elements
what do you understand by stability of a complex and instability constant of coordination compounds
how is excess of copper and iron removed from body
No comments:
Post a Comment