94420 + Interview Questions in Chemistry in Class 12

1.	co-ordination compounds have great importance in biological systems. In these context, which statement is incorrect?
Answer» Carbooxypeptidase-A is an enzyme and contains zinc. Haemoglobin is the red PIGMENT of blood and contains iron . Cyanocobalamin is `B_(12)` and contains cobalt. Chlorophylls are GREEN pigments in plants and CONTAIN calcium. Solution :Chlorophyll contains MAGNESIUM

Discussion

2.	Co-ordination number for copper (Ca) is
Answer» 1 6 8 12 Solution :Copper has CUBIC CLOSE PACKED crystal structure. In this structure ONE Cu atom is attached to ANOTHER 12 spheres (Cu-atom) in metallic copper.

Discussion

3.	Colligativeproperties are observed when ……..
Answer» A nonvolatile SOLID is dissolved in a VOLATILE LIQUID. A nonvolatile liquid is dissolved in an other volatile liquid. A gas is dissolved in nonvolatile liquid. A volatile liquid is dissolved in an other volatile liquid. Answer :A::B

Discussion

4.	Colligative properties depend on ___
Answer» the nature of the SOLUTE PARTICLES dissolved in solution. the number of solute particles in solution. the PHYSICAL PROPERTIES of the solute particles. the natre of solvent particles. Solution :is the correct answer.

Discussion

5.	Co-ordination isomerism is possible in :
Answer» `[AG(NH_(3))_(2)][Ag(CN)_(2)]` `[PT(e n)_(2)][PtCl_(4)]` `[Pt(NH_(3))_(4)][Pt(C_(2)O_(4))_(2)]` `[Pt(NH_(3))_(4)][PtCl_(6)]` Answer :D

Discussion

6.	Collin,s reagent causes the conversion:
Answer» `-COrarrCHOH` `gtgtCHO RARR -COOH` `gtgtCH_2OH rarr -CHO` `gtgtCHOH rarr -COOH` ANSWER :C

Discussion

7.	Co-ordination complexes can show stereoisomerism square planar complexes of Ma_(2)b_(2) type can show geometrical isomerism but not optical & octahedral complexes of Ma_(2)b_(2)C_(2), Ma_(3)b_(3) Mabcdef etc show stereoisomerism, for e.g. Mabcdef have 15 geometrical isomers & all are optically active so it has 15 pairs of enantiomers thus in totaly it has 30 stereoisomers. (a,b,c,d etc. are monodentate lignads while AB is bidenatate ligand) How many pair of enantiomers exits for Ma_(2)b_(2)c_(2)?
Answer» 0 2 1 4 Solution : So STR. (5) & its enantiomer is OPTICALLY active

Discussion

8.	Co-ordination compounds have great importance in biological system in this content which of the following statemt is correct.
Answer» Carboxypeptidese A, is an enzyme and contains zinc Haemoglobin is the red pigment of BLOOD contains COBALT Cyanocobalamine is `B_(12)` and contain cobalt Chlorophylls are green pigments in plants contain calcium Solution :CONCEPTUAL

Discussion

9.	Colligative property measurement is one of the techniques used in the measurement of chemical quantities with reasonable accuracy. If a 40.65 gm sample of K_2SO_4 and BaSO_4 is dissolved in 900 gm of pure water to form a solution 'A' at 57^@C.Its vapours pressure is found to be 39.6 torr while vapour pressure of pure water at 57^@C is 40 torr. Density of solution A is 1.24g/ml. In a different experiment when small amount of pure BaSO_4 is mixed with water at 57^@C it gives the osomotic rise at 4.05xx10^(-5) atm. (R=0.082 Lt.-atm//"mol"-K,K=39,Ba=137,S=32,O=16) Elevation in boiling point of solution A is (K_b "water"=0.54 K-kg//mol):
Answer» 0.3 K 0.1 K 0.04 K 0.05 K Solution :`DeltaT_b=ixxK_bxxm=3xx0.54xx(29.29/174)/0.9=0.3`

Discussion

10.	Co-ordiantion compounds show structural isomerism and it is different from the nature of the isomerism which we generally come across in organic compounds. The co-ordination and linkage isomers depending upon their upon the number of ions which they furnish upon dissociation in aqueous solution . The isomers belonging to a particular type can also be distinguished from each structural isomerism, the co-ordination compounds are also involved in geometrical and optical isomerism. Whereas optical octahedral and square planar complexes can exhibit geometrical isomerism. One mole of the complex compoundgives 3 mole of ions on dissolution in water. One mole of the same complex reacts with two moles ofto yield two moles of . The structure of the complex is :
Answer» `[CO(NH_(3))_(3)Cl_(3)].2NH_(3)` `[Co(NH_(3))_(4)Cl_(2).NH_(3)` `[Co(NH_(3))_(4)Cl]Cl_(2).NH_(3)` `[Co(NH_(3))_(5)Cl]Cl_(2)` Solution :The STRUCTURE for the complex RESPONDS to the characteristics of the complex.

Discussion

11.	Co-ordiantion compounds show structural isomerism and it is different from the nature of the isomerism which we generally come across in organic compounds. The co-ordination and linkage isomers depending upon their upon the number of ions which they furnish upon dissociation in aqueous solution . The isomers belonging to a particular type can also be distinguished from each structural isomerism, the co-ordination compounds are also involved in geometrical and optical isomerism. Whereas optical octahedral and square planar complexes can exhibit geometrical isomerism. Which of the following will not show geometrical isomerism ?
Answer» `[Cr(NH_(3))_(4)Cl_(2)]Cl` `[CoCl_(2)(en)_(2)]Cl` `[Co(NH_(3))_(5)NO_(2)]Cl_(2)` `[PT(NH_(3))_(2).Cl_(2)]` Solution :Octahedral complexes of the type `MA_(5)B` do not show any geometrical ISOMERISM.

Discussion

12.	Colligative property of dilute solutions depends on :
Answer» the NATURE of solute the nature of solvent the NUMBER of PARTICLES of solute the number of particles of solvent. Answer :C

Discussion

13.	Colligative property measurement is one of the techniques used in the measurement of chemical quantities with reasonable accuracy. If a 40.65 gm sample of K_2SO_4 and BaSO_4 is dissolved in 900 gm of pure water to form a solution 'A' at 57^@C.Its vapours pressure is found to be 39.6 torr while vapour pressure of pure water at 57^@C is 40 torr. Density of solution A is 1.24g/ml. In a different experiment when small amount of pure BaSO_4 is mixed with water at 57^@C it gives the osomotic rise at 4.05xx10^(-5) atm. (R=0.082 Lt.-atm//"mol"-K,K=39,Ba=137,S=32,O=16) Concentration of Ba^(2+) ions in solution 'A' is :
Answer» `3.5xx10^(-18) M` `4.7xx10^(-15) M` `2.5xx10^(-12) M` `4XX10^(-13) M` Solution :`[SO_4^(2-)]=((29.29/174)/(900+29.29))/1.24xx1/100=0.224` `:. [BA^(2+)]=(5.6xx10^(-13))/0.224=2.5xx10^(-12) M`

Discussion

14.	CO on passing over heated nickel gives:
Answer» `NiCO_3` `NI(CO)_4` `CO_2 + H_2` `CO + H_2` ANSWER :B

Discussion

15.	Colligative property measurement is one of the techniques used in the measurement of chemical quantities with reasonable accuracy. If a 40.65 gm sample of K_2SO_4 and BaSO_4 is dissolved in 900 gm of pure water to form a solution 'A' at 57^@C.Its vapours pressure is found to be 39.6 torr while vapour pressure of pure water at 57^@C is 40 torr. Density of solution A is 1.24g/ml. In a different experiment when small amount of pure BaSO_4 is mixed with water at 57^@C it gives the osomotic rise at 4.05xx10^(-5) atm. (R=0.082 Lt.-atm//"mol"-K,K=39,Ba=137,S=32,O=16) Solubility product of BaSO_4 in water at 57^@C is :
Answer» `5xx10^(-19)` `3.125xx10^(-13)` `5.625xx10^(-13)` `2.25xx10^(-12)` SOLUTION :`4.05xx10^(-5)=2xxCxx0.082xx330` `C=7.483xx10^(-7)` `therefore K_(SP)=5.6xx10^(-13)`

Discussion

16.	CO+NaOHto
Answer» `HCOONa` `C_(2)H_(2)O_(4)` `HCOOH` `CH_(3)COOH` Solution :`CO+NaOH overset(Delta)toHCOONa`

Discussion

17.	Colligative property measurement is one of the techniques used in the measurement of chemical quantities with reasonable accuracy. If a 40.65 gm sample of K_2SO_4 and BaSO_4 is dissolved in 900 gm of pure water to form a solution 'A' at 57^@C.Its vapours pressure is found to be 39.6 torr while vapour pressure of pure water at 57^@C is 40 torr. Density of solution A is 1.24g/ml. In a different experiment when small amount of pure BaSO_4 is mixed with water at 57^@C it gives the osomotic rise at 4.05xx10^(-5) atm. (R=0.082 Lt.-atm//"mol"-K,K=39,Ba=137,S=32,O=16) Percentage of K_2SO_4 in the sample is :
Answer» `65.75%` `72%` `60.35%` `78.74%` SOLUTION :`(40-39.6)/39.6=(3xxx/174)/50` x=29.29 G `%=29.29/40.65xx100=72%`

Discussion

18.	Colligative property depends only on - in a solution.
Answer» Number of solute PARTICLES Number of SOLVENT particles. NATURE of solute particles. Nature of solvent particles. Answer :A

Discussion

19.	CO is used in the metallurgy of :
Answer» CU NI CR Pt Answer :B

Discussion

20.	CO is used in metallurgy of ..
Answer» CU Ni Cr Pt Solution :Nickel is refined by Mond.s CARBONYL PROCESS. Where Ni forms a volatile COMPOUND with CO i.e., `Ni(CO)_4`

Discussion

21.	CO is _________ toxic than CO_2 and SO_2.
Answer»

Discussion

22.	CO is more toxic than CO_2 because
Answer» It AFFECTS the nervous system It DAMAGES lungs It reduces the oxygen carrying capacity of HAEMOGLOBIN It forms acid with water Solution :CO is more toxic than `CO_2` because it bounds with haemoglobin resultant is LESS amount of haemoglobin to carry oxygenated blood

Discussion

23.	Colligative properties of a solution depend upon the number of moles of a solute dissolved and do not depend upon the nature of the solute. However, they are applicable only to dilute solutions in which the solutes do not undergo any association or dissociation. For solutes undergoing such changes, van't Hoff introduced a factor, called van't Hoff factor (i). This has helped not only to explain the abnormal molecular masses of such solutes in the solution but has also helped to calculate the degree of association or dissociation. Which one of the following aqueous solutions will have the lowest freezing point ?
Answer» 0.1 molal solution of urea 0.1 molal solution of acetic acid 0.1 molal solution of SODIUM chloride 0.1 molal solution of calcium chloride Solution :`CaCl_(2)` GIVES MAXIMUM particles on dissociation. Hence, `DeltaT_(f)` is maximum, i.e., `T_(f)` is lowest.

Discussion

24.	CO is more stable at higher temprature .Why?
Answer» Solution :In the ELLINGHAM diagram ,the formation of carbon MONOXIDE is a straight line with NEGATIVE slope.In this case `DeltaS` is POSITIVE as 2 moles of CO gas is formed by the consumption of one MOLE of oxygen .Hence,CO is more stable at higher temprature

Discussion

25.	CO is a stronger ligand than NH_(3) for many metals. Explain.
Answer» Solution :CO is a stronger field LIGAND than `NH_(3)` because back of bonding leading to SYNERGIC effect. As a RESULT, the bond between the ligand (CO) and metal (M) becomes stronger as COMPOUND to bond between `NH_(3)` and metal which is simply a co-oridinate bond.

Discussion

26.	Colligative properties have been used to determine the_____of the solutes.
Answer» SOLUTION :MOLAR MASS

Discussion

27.	Colligative properties of a solution depend upon the number of moles of a solute dissolved and do not depend upon the nature of the solute. However, they are applicable only to dilute solutions in which the solutes do not undergo any association or dissociation. For solutes undergoing such changes, van't Hoff introduced a factor, called van't Hoff factor (i). This has helped not only to explain the abnormal molecular masses of such solutes in the solution but has also helped to calculate the degree of association or dissociation. The van't Hoff factor for 0.1 M Ba(NO_(3))_(2) solution is 2.74. The degree of dissociation is
Answer» `91.3%` `87%` `100%` `74%` Solution :`{:(,Ba(NO_(3))_(2),hArr,Ba^(2+),+,2NO_(3)^(-)),("INITIAL","1 MOLE",,,,),("After disso.",1-ALPHA,,alpha,,2ALPHA","):}` Total `=1+2alpha therefore i=1+2alpha` `or alpha=(i-1)/(2)=(2.72-1)/(2)=0.87=87%.`

Discussion

28.	CO is a stronger ligand than Cl^- because
Answer» Co is a NEUTRAL MOLECULE Co has `PI` - BONDS Co is poisonous CO is more reactive SOLUTION :Co is a `pi`- donor ligand which acts as a stronger ligand .

Discussion

29.	Colligative properties of a solution depend upon :
Answer» MOLARITY NUMBER of MOLES of SOLUTE Number of moles of solvent Nature of solute. SOLUTION :Number of moles of solute

Discussion

30.	CO is a reducing agent. Justify with an example.
Answer» Solution :Both THERMODYNAMIC and KINETIC factors make carbon MONOXIDE (CO) a better reducing agent. When CO is used to reduce a metal oxide, it gets OXIDIZED to `CO_(2)`. Thermodynamically `CO_(2)` is much more stable than CO For EXAMPLE. `CO+Fe_(2)O_(3)to2Fe+3CO_(2)`

Discussion

31.	Colligative properties depend on ………….
Answer» the nature of the SOLUTE PARTICLES dissolved in solution the number of solute particles in solution the physical PROPERTIES of the solute particles dissolved in solution the nature of solvent particles Answer :B

Discussion

32.	CO (g) and H2(g) react to give different products in the presence of different catalysts. Which ability of the catalyst is shown by these reactions?
Answer» SOLUTION :SELECTIVITY of a CATALYST

Discussion

33.	Colligative properties depend on …….
Answer» The NATURE of the solute particles DISSOLVED in solution. The number of solute particles in solution. The physical PROPERTIES of the solute particles dissolved in solution. The nature of solvent particles. Answer :B

Discussion

34.	CO (g) and H_2(g) react to give different products in the presence of different catalysts. Which ability of the catalyst is shown by these reactions ?
Answer» SOLUTION :This is KNOWN as SELECTIVITY of the CATALYST.

Discussion

35.	Elevation of boiling point is a colligative property. What is colligative properties ?
Answer» SOLUTION :PROPERTIES of dilute solutions that depend only on the number of solute PARTICLES are CALLED COLLIGATIVE properties.

Discussion

36.	CO forms a volatile compound with :
Answer» Nickel Copper Sodium Aluminium Answer :A

Discussion

37.	Colligative properties can beused to determine the molecular mass of solutes in solutions. For determining the molecular mass of polymers, osmotic pressure is preffered to other properties. Why ?
Answer» Solution :Osmoticpressure MEASUREMENTS can be DONE at the room temperature. For small amount of SOLUTE, large value of OSMOTIC PRESSURE will be obtain.

Discussion

38.	CO- factors (non- protein prosthetic groups) used to bond conjugated proteins are :
Answer» Carbohydrates Phosphoric ACID IRON pigments All the CORRECT ANSWER :D

Discussion

39.	CO convertsa sulphuricacid solutionof 2 - methyl -2- butene, t - pentyl alcohol , neopentyl acohol into 2, 2-dimethylbutanoicacid. Suggesta mechansim for this conversion .
Answer» SOLUTION :

Discussion

40.	Colligative properties depend on ______
Answer» the NATURE of the solute PARTICLES dissolved in solution. the NUMBER of solute particles in solution. the physical properties of the solute particles dissolved in solution. the nature of SOLVENT particles. Solution : the number of solute particles in solution.

Discussion

41.	CO cannot be used for the reduction of ZnO- why?
Answer» Solution :`Delta_(f)G^(@)` of `CO_(2)` from `CO` always remains less negative than the `Delta_(f)G^(@)` of `ZnO`. Therefore, CO cannot be USED for the REDUCTION of `ZnO.`

Discussion

42.	For intravenous injections, only solutions with freezing point depression equal to that of 0.9% NaCl solution is used Why ?
Answer» Solution :Due to same OSMOTIC pressure, i.e., BLOOD is ISOTONIC with this solution.

Discussion

43.	CO and N_(2) mixture is ……..
Answer» NATURAL gas producer gas water gas LPG Answer :B

Discussion

44.	Colligative properties are properties of solutions which depend on the number of solute particles irrespective of their nature. Name the four important colligative properties
Answer» Solution :(i) RELATIVE lowering of vapour PRESSURE (ii) ELEVATION in boiling point (III) DEPRESSION in freezing point Osmotic pressure

Discussion

45.	C_(n)H_(2n) is the general formula of :
Answer» Only ALKENES Only alkynes Only ARENES Both alkenes and CYCLOALKANES. ANSWER :D

Discussion

46.	Colligative properties are properties of solutions which depend on the number of solute particles irrespective of their nature. What happens to the colligative properties when ethanoic acid is treated with benzene ?
Answer» Solution :Magnitude of colligative properties decreases due to the decreases in the NUMBER of particles . This is due to association of ethanoic acid in benzene to form DIMERS.

Discussion

47.	C_(n)H_(2n) O is general formula for
Answer» ALDEHYDES ketones all CARBONYL COMPOUNDS ALDEHYDE and ketones Answer :D

Discussion

48.	Colligative properties are properties of solution which depends on the number of solute particles in the solution. The value of van't Hoff factor, 'i', for aqueous KCl solution is close to 2, while the value of 'I' for ethanoic acid in benzene is nearly 0.5. Give reasons
Answer» Solution :KCl in AQUEOUS solution undergoes dissociation as KCl`toK^++Cl^-` Thus, the NUMBER of PARTICLES in solution becomes double and hence van.t Hoff factor .I. for aqueous KCl solution is close to 2. ETHANOIC acid in benzene undergoes, association (dimerisation). `therefore` i is nearly

Discussion

49.	CN^(-) solution is used in the extraction of which metal ?
Answer» AG Ti Zn Sn. Solution :`CN^(-)` solution is USED in the EXTRACTION of Ag metal.

Discussion

50.	Colligative properties are observed when ……………… .
Answer» a non-volatile SOLID is dissolved in a volatile LIQUID a non-volatile liquid is dissolved in ANOTHER volatile liquid a gas is dissolved in non-volatile liquid a volatile liquid is dissolved in another volatile liquid Answer :a,B

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

co-ordination compounds have great importance in biological systems. In these context, which statement is incorrect?

Co-ordination number for copper (Ca) is

Colligativeproperties are observed when ……..

Colligative properties depend on ___

Co-ordination isomerism is possible in :

Collin,s reagent causes the conversion:

Co-ordination compounds have great importance in biological system in this content which of the following statemt is correct.

Colligative property of dilute solutions depends on :

CO on passing over heated nickel gives:

CO+NaOHto

Colligative property depends only on - in a solution.

CO is used in the metallurgy of :

CO is used in metallurgy of ..

CO is _________ toxic than CO_2 and SO_2.

CO is more toxic than CO_2 because

CO is more stable at higher temprature .Why?

CO is a stronger ligand than NH_(3) for many metals. Explain.

Colligative properties have been used to determine the_____of the solutes.

CO is a stronger ligand than Cl^- because

Colligative properties of a solution depend upon :

CO is a reducing agent. Justify with an example.

Colligative properties depend on ………….

CO (g) and H2(g) react to give different products in the presence of different catalysts. Which ability of the catalyst is shown by these reactions?

Colligative properties depend on …….

CO (g) and H_2(g) react to give different products in the presence of different catalysts. Which ability of the catalyst is shown by these reactions ?

Elevation of boiling point is a colligative property. What is colligative properties ?

CO forms a volatile compound with :

Colligative properties can beused to determine the molecular mass of solutes in solutions. For determining the molecular mass of polymers, osmotic pressure is preffered to other properties. Why ?

CO- factors (non- protein prosthetic groups) used to bond conjugated proteins are :

CO convertsa sulphuricacid solutionof 2 - methyl -2- butene, t - pentyl alcohol , neopentyl acohol into 2, 2-dimethylbutanoicacid. Suggesta mechansim for this conversion .

Colligative properties depend on ______

CO cannot be used for the reduction of ZnO- why?

For intravenous injections, only solutions with freezing point depression equal to that of 0.9% NaCl solution is used Why ?

CO and N_(2) mixture is ……..

Colligative properties are properties of solutions which depend on the number of solute particles irrespective of their nature. Name the four important colligative properties

C_(n)H_(2n) is the general formula of :

Colligative properties are properties of solutions which depend on the number of solute particles irrespective of their nature. What happens to the colligative properties when ethanoic acid is treated with benzene ?

C_(n)H_(2n) O is general formula for

Colligative properties are properties of solution which depends on the number of solute particles in the solution. The value of van't Hoff factor, 'i', for aqueous KCl solution is close to 2, while the value of 'I' for ethanoic acid in benzene is nearly 0.5. Give reasons

CN^(-) solution is used in the extraction of which metal ?

Colligative properties are observed when ……………… .