46295 + Interview Questions in Chemistry

1.	0.2 g of an organic compound was analysed by Kjeldahl’s method. The ammonia gas evolved was absorbed by 60 mL of N/5 H2SO4. The unused acid required 40 mL of N/10 NaOH for complete neutralisation. Find the percentage of N2 in the sample.
Answer» $0.2 g$ of an organic compound was analysed by Kjeldahl’s method. The ammonia gas evolved was absorbed by $60 mL of N / 5 H_{2} S O_{4}$ . The unused acid required $40 mL of N / 10 N a O H$ for complete neutralisation. Find the percentage of $N_{2}$ in the sample.

Discussion

2.	Which of the following reaction does not involve Hoffmann bromamide degradation?
Answer» Which of the following reaction does not involve Hoffmann bromamide degradation?

Discussion

3.	. If 9x2 + 4y2 + z2 – 6xy – 2yz – 3xz = 0, then prove 3x =2y=z .
Answer» . If 9x2 + 4y2 + z2 – 6xy – 2yz – 3xz = 0, then prove 3x =2y=z .

Discussion

4.	Pure water freezes at 273 K and 1 bar. The addition of 34.5 g of ethanol to 500 g of water changes the freezing point of the solution. Use the freezing point depression constant of water as 2 Kkgmol−1. The figures shown below represent plots of vapour pressure (V.P.) versus temperature (T). [molecular weight of ethanol is 46 gmol−1] Among the following, the option representing change in the freezing point is:
Answer» Pure water freezes at $273 K$ and $1 b a r$ . The addition of $34.5 g$ of ethanol to $500 g$ of water changes the freezing point of the solution. Use the freezing point depression constant of water as $2 K k g m o l^{- 1}$ . The figures shown below represent plots of vapour pressure (V.P.) versus temperature (T). [molecular weight of ethanol is $46 g m o l^{- 1}$ ] Among the following, the option representing change in the freezing point is:

Discussion

5.	49. The equivalent weight of metal whose 1 g carbonateon heating gives 0.6 g of metal oxide, is(1) 25 g(2) 30 gn(3) 35 g(4) 40 g
Answer» 49. The equivalent weight of metal whose 1 g carbonateon heating gives 0.6 g of metal oxide, is(1) 25 g(2) 30 gn(3) 35 g(4) 40 g

Discussion

6.	Which species doesn’t exist?
Answer» Which species doesn’t exist?

Discussion

7.	3. The number of waves made by a Bohr electron in one complete revolutuon in 3rd orbit is
Answer» 3. The number of waves made by a Bohr electron in one complete revolutuon in 3rd orbit is

Discussion

8.	27. Ethyl Chloride react with aqueous KOH and the product is (a)Ethyl alcohol (b)Ethene (c)Mixture of both (d)none
Answer» 27. Ethyl Chloride react with aqueous KOH and the product is (a)Ethyl alcohol (b)Ethene (c)Mixture of both (d)none

Discussion

9.	arrange in the order of nicleophilicity:- C_6H_5O^- ,C_6H_5S^- ,C_6H_5CH_2^- ,CH_3COCH_2^{
Answer» arrange in the order of nicleophilicity:- C_6H_5O^- ,C_6H_5S^- ,C_6H_5CH_2^- ,CH_3COCH_2^{

Discussion

10.	Two moles of an ideal gas undergoes the process shown in figure. AB and CD are reversible adiabatic processes. Which of the following shows above process on T - V diagram?
Answer» Two moles of an ideal gas undergoes the process shown in figure. AB and CD are reversible adiabatic processes. Which of the following shows above process on T - V diagram?

Discussion

11.	Two elements whose electronegativities are 1.2 and 3.0 the bond formed between them would be
Answer» Two elements whose electronegativities are 1.2 and 3.0 the bond formed between them would be

11.

Two elements whose electronegativities are 1.2 and 3.0 the bond formed between them would be

Answer»

Two elements whose electronegativities are 1.2 and 3.0 the bond formed between them would be

Discussion

12.	23. The wave length of the third line of the Balmer series for a hydrogen atom is
Answer» 23. The wave length of the third line of the Balmer series for a hydrogen atom is

Discussion

13.	In the reaction X and Y are respectively :
Answer» In the reaction X and Y are respectively :

Discussion

14.	The major product 'A' is
Answer» The major product 'A' is

14.

The major product 'A' is

Answer»

The major product 'A' is

Discussion

15.	1ml of co2 contains x molecules .co2 is filled in a cubical room of side 10 cm.find the no of atoms
Answer» 1ml of co2 contains x molecules .co2 is filled in a cubical room of side 10 cm.find the no of atoms

Discussion

16.	Which of the following is an α - elimination reaction?
Answer» Which of the following is an $α$ - elimination reaction?

Discussion

17.	NO and Br2 at initial partial pressures of 98.4 and 41.3 torr, respectively, were allowed to react at 300 K. At equilibrium the total pressure was 110.5 torr. Calculate the value of the equilibrium constant (Kp) at 300 K, for the reaction 2NO(g)+Br2(g)⇌2NOBr(g).
Answer» $N O$ and $B r_{2}$ at initial partial pressures of 98.4 and 41.3 $torr$ , respectively, were allowed to react at $300 K$ . At equilibrium the total pressure was $110.5 torr$ . Calculate the value of the equilibrium constant ( $K p$ ) at $300 K$ , for the reaction $2 N O (g) + B r_{2} (g) ⇌ 2 N O B r (g) .$

Discussion

18.	BrCH2CHBrCH2Bralc.KOH−−−−−→[X]CH3O−−−−−→Y;[X] and [Y] respectively are
Answer» $B r C H_{2} C H B r C H_{2} B r a l c . K O H - ---- \to [X] C H_{3} O^{-} - --- \to Y; [X]$ and [Y] respectively are

Discussion

19.	Cp-Cv=a for hydrogen Cp-Cv=b for nitrogen relation ship between a and
Answer» Cp-Cv=a for hydrogen Cp-Cv=b for nitrogen relation ship between a and

Discussion

20.	enthalpy of polyme risation of ethylene as represented by the reaction, n CH_2=CH_2\xrightarrow[{}]{}(-CH_2-CH_2-)n is △100 kj per mol of ethylene. given bond enthalpy of C=C BOND IS 600 KJ/mol, enthalpy of C△ C BOND ( IN KJ) WILL B
Answer» enthalpy of polyme risation of ethylene as represented by the reaction, n CH_2=CH_2\xrightarrow[{}]{}(-CH_2-CH_2-)n is △100 kj per mol of ethylene. given bond enthalpy of C=C BOND IS 600 KJ/mol, enthalpy of C△ C BOND ( IN KJ) WILL B

Discussion

21.	How many structural isomers of C5H10 are possible.
Answer» How many structural isomers of $C_{5} H_{10}$ are possible.

Discussion

22.	59.Why melting of Bismuth is lower than that of Antimony though Antimony has less molecular weight
Answer» 59.Why melting of Bismuth is lower than that of Antimony though Antimony has less molecular weight

Discussion

23.	Which of the following orbitals described by three quantum numbers will have different energies for a multielectron atom, in the absence of external electric and magnetic fields?(1) n = 1, l = 0, m = 0(2) n = 2, l = 1, m = -1(3) n = 2, l = 1, m = +1(4) n = 3, l = 2, m = +1(5) n = 3, l = 2, m = 0
Answer» Which of the following orbitals described by three quantum numbers will have different energies for a multielectron atom, in the absence of external electric and magnetic fields? $(1) n = 1, l = 0, m = 0$ $(2) n = 2, l = 1, m = -1$ $(3) n = 2, l = 1, m = +1$ $(4) n = 3, l = 2, m = +1$ $(5) n = 3, l = 2, m = 0$

Discussion

24.	The unit cell volume of NaCl is observed to be 0.1755 nm3 by X-ray diffraction studies; the measured density of NaCl is 2.164 gcm−3. Calculate the percentage ofmissing Na+ and Cl− ions. (M.W. = 58.5 gmol−1) Given: NA=6×1023
Answer» The unit cell volume of $N a C l$ is observed to be 0.1755 $n m^{3}$ by X-ray diffraction studies; the measured density of $N a C l$ is 2.164 $g c m^{- 3}$ . Calculate the percentage ofmissing $N a^{+}$ and $C l^{-}$ ions. (M.W. = 58.5 $g m o l^{- 1}$ ) Given: $N_{A} = 6 \times 10^{23}$

Discussion

25.	Which of the following(s) gives a tertiary alcohol on treating with excess of Grignard reagent?
Answer» Which of the following(s) gives a tertiary alcohol on treating with excess of Grignard reagent?

Discussion

26.	The compressibility of a gas is less than unity at STP. Therefore?
Answer» The compressibility of a gas is less than unity at STP. Therefore?

Discussion

27.	why hydrogen occurs in atomic form only in high temperatures only ?
Answer» why hydrogen occurs in atomic form only in high temperatures only ?

Discussion

28.	What is meant by 'Biverticillate' and 'Monoverticillate' ?
Answer» What is meant by 'Biverticillate' and 'Monoverticillate' ?

Discussion

29.	Increasing order of acidic strength of given compounds is:
Answer» Increasing order of acidic strength of given compounds is:

Discussion

30.	Explain screening effect and s,p,d,f method
Answer» Explain screening effect and s,p,d,f method

Discussion

31.	Which of the following is not obtained when Zn is treated with dil. HNO3?
Answer» Which of the following is not obtained when Zn is treated with dil. $H N O_{3}$ ?

Discussion

32.	Which single bonded molecule has maximum bond enthalpy in general?
Answer» Which single bonded molecule has maximum bond enthalpy in general?

Discussion

33.	Write down the products of ozonolysis of 1, 2-dimethylbenzene (o-xylene). How does the result support Kekulé structure for benzene?
Answer» Write down the products of ozonolysis of 1, 2-dimethylbenzene (o-xylene). How does the result support Kekulé structure for benzene?

Discussion

34.	The transition from state n = 4 to n = 3 in a He+ ion result in ultraviolet radiation. Infrared radiation will be obtained in the transition from
Answer» The transition from state n = 4 to n = 3 in a $H e^{+}$ ion result in ultraviolet radiation. Infrared radiation will be obtained in the transition from

Discussion

35.	An excess of AgNO3 is added to 100ml of 0.01M solution of diclorotetraaquachromium (III) chloride. How many moles of AgCl would be precipitated?
Answer» An excess of AgNO3 is added to 100ml of 0.01M solution of diclorotetraaquachromium (III) chloride. How many moles of AgCl would be precipitated?

Discussion

36.	which among the following has high boiling point a.H20 b.CH4 c.HFd.NH
Answer» which among the following has high boiling point a.H20 b.CH4 c.HFd.NH

Discussion

37.	In a fuel cell, H2& O2 react to produce electricity. In the process, H2 gas is oxidized at the anode & O2 at the cathode . If 67.2 litre of H2 at STP react in 15 minutes, If the entire current is used for electrode deposition of Cu from Cu (II) solution, how many grams of Cu will be deposited?
Answer» In a fuel cell, H2& O2 react to produce electricity. In the process, H2 gas is oxidized at the anode & O2 at the cathode . If 67.2 litre of H2 at STP react in 15 minutes, If the entire current is used for electrode deposition of Cu from Cu (II) solution, how many grams of Cu will be deposited?

Discussion

38.	Amongst the following identify the species with an atom in + 6 oxidation state:
Answer» Amongst the following identify the species with an atom in + 6 oxidation state:

Discussion

39.	Give plausible explanation for each of the following: (i) Why are amines less acidic than alcohols of comparable molecular masses? (ii) Why do primary amines have higher boiling point that tertiary amines? (iii) Why are aliphatic amines stronger bases than aromatic amines?
Answer» Give plausible explanation for each of the following: (i) Why are amines less acidic than alcohols of comparable molecular masses? (ii) Why do primary amines have higher boiling point that tertiary amines? (iii) Why are aliphatic amines stronger bases than aromatic amines?

39.

Give plausible explanation for each of the following: (i) Why are amines less acidic than alcohols of comparable molecular masses? (ii) Why do primary amines have higher boiling point that tertiary amines? (iii) Why are aliphatic amines stronger bases than aromatic amines?

Answer»

Give plausible explanation for each of the following:

(i) Why are amines less acidic than alcohols of comparable molecular masses?

(ii) Why do primary amines have higher boiling point that tertiary amines?

(iii) Why are aliphatic amines stronger bases than aromatic amines?

Discussion

40.	Zinc sulphate contains 22.65% Zn and 43.9% H2O. If the law of coof Zinc required to give 40 g crystal will benstant proportions is true, then themass
Answer» Zinc sulphate contains 22.65% Zn and 43.9% H2O. If the law of coof Zinc required to give 40 g crystal will benstant proportions is true, then themass

Discussion

41.	Among the following compounds, the most acidic is:
Answer» Among the following compounds, the most acidic is:

Discussion

42.	The active masses of pure solid or liquid phasesare not included in theexpression of equilibrium constant as: a)solid and liquid concentrations are independent of their quantities b)solids and liquids react very slowly c)solids and liquids at equilibrium do not interact with gaseous phase d)the molecules of solids and liquids do not migrate to the gaseous phase
Answer» The active masses of pure solid or liquid phasesare not included in theexpression of equilibrium constant as: a)solid and liquid concentrations are independent of their quantities b)solids and liquids react very slowly c)solids and liquids at equilibrium do not interact with gaseous phase d)the molecules of solids and liquids do not migrate to the gaseous phase

42.

The active masses of pure solid or liquid phasesare not included in theexpression of equilibrium constant as: a)solid and liquid concentrations are independent of their quantities b)solids and liquids react very slowly c)solids and liquids at equilibrium do not interact with gaseous phase d)the molecules of solids and liquids do not migrate to the gaseous phase

Answer»

The active masses of pure solid or liquid phasesare not included in theexpression of equilibrium constant as:
a)solid and liquid concentrations are independent of their quantities
b)solids and liquids react very slowly
c)solids and liquids at equilibrium do not interact with gaseous phase

d)the molecules of solids and liquids do not migrate to the gaseous phase

Discussion

43.	If the bond length of the C−O bond in CO is 1.128oA, what will be the value of the bond length in [Fe(CO)5]?
Answer» If the bond length of the C−O bond in CO is $1.128 o A$ , what will be the value of the bond length in $[F e (C O)_{5}]$ ?

Discussion

44.	A hydrocarbon of formula C6H10 absorbs only one molecule of H2upon catalytic hydrogenation. Upon ozonolysis, the hydrocarbon yieldsThe hydrocarbon is
Answer» A hydrocarbon of formula $C_{6} H_{10}$ absorbs only one molecule of H2upon catalytic hydrogenation. Upon ozonolysis, the hydrocarbon yields The hydrocarbon is

44.

A hydrocarbon of formula C6H10 absorbs only one molecule of H2upon catalytic hydrogenation. Upon ozonolysis, the hydrocarbon yieldsThe hydrocarbon is

Answer»

A hydrocarbon of formula $C_{6} H_{10}$ absorbs only one molecule of H2upon catalytic hydrogenation. Upon ozonolysis, the hydrocarbon yields

The hydrocarbon is

Discussion

45.	Are unit cell and crystal system the same terms if not then what is the difference between them?
Answer» Are unit cell and crystal system the same terms if not then what is the difference between them?

Discussion

46.	The reagent that gives an orange colouration with acetaldehyde is:
Answer» The reagent that gives an orange colouration with acetaldehyde is:

Discussion

47.	Which of the following parameters is correct regarding the adsorption of gases over solids?
Answer» Which of the following parameters is correct regarding the adsorption of gases over solids?

Discussion

48.	Which of the following has the least value of dipole moment? (correct answer +1, wrong answer -0.25)
Answer» Which of the following has the least value of dipole moment? (correct answer +1, wrong answer -0.25)

Discussion

49.	The appropriate reagent for the following transformation:
Answer» The appropriate reagent for the following transformation:

49.

The appropriate reagent for the following transformation:

Answer»

The appropriate reagent for the following transformation:

Discussion

50.	The osmotic pressure of the solution is given by the relation :where,π is osmotic pressureT is temperatureR is ideal gas constantn are number of molesV is volumeAll quantites are in their SI units
Answer» The osmotic pressure of the solution is given by the relation : where, $π is osmotic pressure$ $T is temperature$ $R is ideal gas constant$ $n are number of moles$ $V is volume$ All quantites are in their SI units

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

0.2 g of an organic compound was analysed by Kjeldahl’s method. The ammonia gas evolved was absorbed by 60 mL of N/5 H2SO4. The unused acid required 40 mL of N/10 NaOH for complete neutralisation. Find the percentage of N2 in the sample.

Which of the following reaction does not involve Hoffmann bromamide degradation?

. If 9x2 + 4y2 + z2 – 6xy – 2yz – 3xz = 0, then prove 3x =2y=z .

49. The equivalent weight of metal whose 1 g carbonateon heating gives 0.6 g of metal oxide, is(1) 25 g(2) 30 gn(3) 35 g(4) 40 g

Which species doesn’t exist?

3. The number of waves made by a Bohr electron in one complete revolutuon in 3rd orbit is

27. Ethyl Chloride react with aqueous KOH and the product is (a)Ethyl alcohol (b)Ethene (c)Mixture of both (d)none

arrange in the order of nicleophilicity:- C_6H_5O^- ,C_6H_5S^- ,C_6H_5CH_2^- ,CH_3COCH_2^{

Two moles of an ideal gas undergoes the process shown in figure. AB and CD are reversible adiabatic processes. Which of the following shows above process on T - V diagram?

Two elements whose electronegativities are 1.2 and 3.0 the bond formed between them would be

23. The wave length of the third line of the Balmer series for a hydrogen atom is

In the reaction X and Y are respectively :

The major product 'A' is

1ml of co2 contains x molecules .co2 is filled in a cubical room of side 10 cm.find the no of atoms

Which of the following is an α - elimination reaction?

NO and Br2 at initial partial pressures of 98.4 and 41.3 torr, respectively, were allowed to react at 300 K. At equilibrium the total pressure was 110.5 torr. Calculate the value of the equilibrium constant (Kp) at 300 K, for the reaction 2NO(g)+Br2(g)⇌2NOBr(g).

BrCH2CHBrCH2Bralc.KOH−−−−−→[X]CH3O−−−−−→Y;[X] and [Y] respectively are

Cp-Cv=a for hydrogen Cp-Cv=b for nitrogen relation ship between a and

enthalpy of polyme risation of ethylene as represented by the reaction, n CH_2=CH_2\xrightarrow[{}]{}(-CH_2-CH_2-)n is △100 kj per mol of ethylene. given bond enthalpy of C=C BOND IS 600 KJ/mol, enthalpy of C△ C BOND ( IN KJ) WILL B

How many structural isomers of C5H10 are possible.

59.Why melting of Bismuth is lower than that of Antimony though Antimony has less molecular weight

Which of the following orbitals described by three quantum numbers will have different energies for a multielectron atom, in the absence of external electric and magnetic fields?(1) n = 1, l = 0, m = 0(2) n = 2, l = 1, m = -1(3) n = 2, l = 1, m = +1(4) n = 3, l = 2, m = +1(5) n = 3, l = 2, m = 0

The unit cell volume of NaCl is observed to be 0.1755 nm3 by X-ray diffraction studies; the measured density of NaCl is 2.164 gcm−3. Calculate the percentage ofmissing Na+ and Cl− ions. (M.W. = 58.5 gmol−1) Given: NA=6×1023

Which of the following(s) gives a tertiary alcohol on treating with excess of Grignard reagent?

The compressibility of a gas is less than unity at STP. Therefore?

why hydrogen occurs in atomic form only in high temperatures only ?

What is meant by 'Biverticillate' and 'Monoverticillate' ?

Increasing order of acidic strength of given compounds is:

Explain screening effect and s,p,d,f method

Which of the following is not obtained when Zn is treated with dil. HNO3?

Which single bonded molecule has maximum bond enthalpy in general?

Write down the products of ozonolysis of 1, 2-dimethylbenzene (o-xylene). How does the result support Kekulé structure for benzene?

The transition from state n = 4 to n = 3 in a He+ ion result in ultraviolet radiation. Infrared radiation will be obtained in the transition from

An excess of AgNO3 is added to 100ml of 0.01M solution of diclorotetraaquachromium (III) chloride. How many moles of AgCl would be precipitated?

which among the following has high boiling point a.H20 b.CH4 c.HFd.NH

Amongst the following identify the species with an atom in + 6 oxidation state:

Give plausible explanation for each of the following: (i) Why are amines less acidic than alcohols of comparable molecular masses? (ii) Why do primary amines have higher boiling point that tertiary amines? (iii) Why are aliphatic amines stronger bases than aromatic amines?

Zinc sulphate contains 22.65% Zn and 43.9% H2O. If the law of coof Zinc required to give 40 g crystal will benstant proportions is true, then themass

Among the following compounds, the most acidic is:

If the bond length of the C−O bond in CO is 1.128oA, what will be the value of the bond length in [Fe(CO)5]?

A hydrocarbon of formula C6H10 absorbs only one molecule of H2upon catalytic hydrogenation. Upon ozonolysis, the hydrocarbon yieldsThe hydrocarbon is

Are unit cell and crystal system the same terms if not then what is the difference between them?

The reagent that gives an orange colouration with acetaldehyde is:

Which of the following parameters is correct regarding the adsorption of gases over solids?

Which of the following has the least value of dipole moment? (correct answer +1, wrong answer -0.25)

The appropriate reagent for the following transformation:

The osmotic pressure of the solution is given by the relation :where,π is osmotic pressureT is temperatureR is ideal gas constantn are number of molesV is volumeAll quantites are in their SI units