46295 + Interview Questions in Chemistry

1.	Among the following acids which has the lowest pKa value?
Answer» Among the following acids which has the lowest $p K_{a}$ value?

Discussion

2.	The major product formed when 2-butene is reacted with O3 followed by treatment with Zn/H2O is:
Answer» The major product formed when 2-butene is reacted with $O_{3}$ followed by treatment with $Z n / H_{2} O$ is:

Discussion

3.	The element whose salts cannot be detected by flame test is:
Answer» The element whose salts cannot be detected by flame test is:

Discussion

4.	Which one of the following has the most nucleophilic nitrogen ?
Answer» Which one of the following has the most nucleophilic nitrogen ?

Discussion

5.	Carbon percentage is maximum in [BHU 1998]
Answer» Carbon percentage is maximum in [BHU 1998]

Discussion

6.	In an atom, an electron is moving with a speed of 600 sec−1 with a accuracy of 0.005%, certainity with which the position of electron can be located is
Answer» In an atom, an electron is moving with a speed of 600 $s e c^{- 1}$ with a accuracy of 0.005%, certainity with which the position of electron can be located is

Discussion

7.	In the conversion NH2OH⟶N2O the equivalent weight of NH2OH will be
Answer» In the conversion $N H_{2} O H ⟶ N_{2} O$ the equivalent weight of $N H_{2} O H$ will be

7.

In the conversion NH2OH⟶N2O the equivalent weight of NH2OH will be

Answer»

In the conversion

$N H_{2} O H ⟶ N_{2} O$

the equivalent weight of $N H_{2} O H$ will be

Discussion

8.	The number of unit cells in 58.5g of NaCl is nearly [MP PMT 2000, 01]
Answer» The number of unit cells in 58.5g of NaCl is nearly [MP PMT 2000, 01]

8.

The number of unit cells in 58.5g of NaCl is nearly [MP PMT 2000, 01]

Answer»

The number of unit cells in 58.5g of NaCl is nearly

[MP PMT 2000, 01]

Discussion

9.	In a single hydrogen atom, the electron is excited to its 6th orbit. The maximum no. of distinct lines possible, when it comes to the ground state is:
Answer» In a single hydrogen atom, the electron is excited to its $6^{t h}$ orbit. The maximum no. of distinct lines possible, when it comes to the ground state is:

Discussion

10.	The freezing point of 1 m NaCl solution, assuming NaCl to be 100% dissociated in water
Answer» The freezing point of 1 m NaCl solution, assuming NaCl to be 100% dissociated in water

Discussion

11.	For the above reaction , the major product (A) is :
Answer» For the above reaction , the major product (A) is :

Discussion

12.	Bromine is obtained on commercial scale from
Answer» Bromine is obtained on commercial scale from

Discussion

13.	The correct order of hydration enthalpies of alkali metal ions is:
Answer» The correct order of hydration enthalpies of alkali metal ions is:

Discussion

14.	A 40.0 mL solution of a weak base, BOH is titrated with 0.1 N HCl solution. The pH of the solution is found to be 10.04 and 9.14 after adding 5.0 mL and 20.0 mL of the acid respectively. The dissociation constant of the base is:
Answer» A 40.0 mL solution of a weak base, BOH is titrated with 0.1 N HCl solution. The pH of the solution is found to be 10.04 and 9.14 after adding 5.0 mL and 20.0 mL of the acid respectively. The dissociation constant of the base is:

Discussion

15.	Aniline in a set of the following reactions yielded a coloured product ‘Y’.Compound Y is:
Answer» Aniline in a set of the following reactions yielded a coloured product ‘Y’.Compound Y is:

Discussion

16.	In the reaction: Cr2O3+Na2CO3+KNO3⟶Na2CrO4+CO2+KNO2 sum of equivalent weights of KNO2 and Na2CrO4 produced is .
Answer» In the reaction: $C r_{2} O_{3} + N a_{2} C O_{3} + K N O_{3} ⟶ N a_{2} C r O_{4} + C O_{2} + K N O_{2}$ sum of equivalent weights of $K N O_{2}$ and $N a_{2} C r O_{4}$ produced is .

Discussion

17.	A gas formed by the action of alcoholic KOH on ethyl iodide, decolorizes alkaline KMnO4 solution. The gas is
Answer» A gas formed by the action of alcoholic KOH on ethyl iodide, decolorizes alkaline KMnO₄ solution. The gas is

Discussion

18.	What is the oxidation number of Nitrogen in NO3−1 ion?
Answer» What is the oxidation number of Nitrogen in ${N O_{3}}^{- 1}$ ion?

Discussion

19.	Describe the change in hybridisation (if any) of the Al atom in the following reaction. AlCl3+Cl−→AlCl−4
Answer» Describe the change in hybridisation (if any) of the Al atom in the following reaction. $A l C l_{3} + C l^{-} \to A l C l_{4}^{-}$

19.

Describe the change in hybridisation (if any) of the Al atom in the following reaction. AlCl3+Cl−→AlCl−4

Answer»

Describe the change in hybridisation (if any) of the Al atom in the following reaction.

$A l C l_{3} + C l^{-} \to A l C l_{4}^{-}$

Discussion

20.	Calculate the number of photons emitted per second by a 10 W sodium vapour lamp. Assume that 60 % of the consumed energy is converted into light. Wavelength of sodium light = 590 nm.
Answer» Calculate the number of photons emitted per second by a 10 W sodium vapour lamp. Assume that 60 $%$ of the consumed energy is converted into light. Wavelength of sodium light = 590 nm.

Discussion

21.	Which one of the following compound is not a protonic acid
Answer» Which one of the following compound is not a protonic acid

21.

Which one of the following compound is not a protonic acid

Answer»

Which one of the following compound is not a protonic acid

Discussion

22.	A white substance having alkaline nature in solution is
Answer» A white substance having alkaline nature in solution is

Discussion

23.	450 mL of a strong acid solution of pH = 2.0 is mixed with 550 mL of another acid solution of pH = 3.0. The pH of resultant solution is
Answer» 450 mL of a strong acid solution of pH = 2.0 is mixed with 550 mL of another acid solution of pH = 3.0. The pH of resultant solution is

Discussion

24.	Ozonolysis of which one of the following will give two molecules of acetaldehyde
Answer» Ozonolysis of which one of the following will give two molecules of acetaldehyde

Discussion

25.	Which of the following is a bicyclo compounds?
Answer» Which of the following is a bicyclo compounds?

Discussion

26.	Specify the co-ordination geometry around and hybridization of N and B-atoms in a 1 : 1 complex of BF3 and NH3:
Answer» Specify the co-ordination geometry around and hybridization of N and B-atoms in a 1 : 1 complex of BF₃ and $N H_{3}$ :

Discussion

27.	Calculate the hydrolysis constant of a salt containing NO−2 ion. If Ka for HNO2=4.5×10−10.
Answer» Calculate the hydrolysis constant of a salt containing $N O_{2}^{-}$ ion. If $K_{a}$ for $H N O_{2} = 4.5 \times 10^{- 10}$ .

Discussion

28.	The elevation in boiling point of a solution of 13.44g of CuCl2 in 1kg of water using the following information will be (Molecular weight of CuCl2= 134.4 and Kb= 0.52K molal-1)
Answer» The elevation in boiling point of a solution of 13.44g of CuCl₂ in 1kg of water using the following information will be (Molecular weight of CuCl₂= 134.4 and K_b= 0.52K molal^-1)

Discussion

29.	The equilibrium constant for the reaction, 2SO2(g)+O2(g)⇌2SO3(g) is 256 at 1000K. The equilibrium constant for the reaction SO3(g)⇌SO2(g)+12O2(g) is:
Answer» The equilibrium constant for the reaction, $2 S O_{2} (g) + O_{2} (g) ⇌ 2 S O_{3} (g)$ is 256 at 1000K. The equilibrium constant for the reaction $S O_{3} (g) ⇌ S O_{2} (g) + \frac{1}{2} O_{2} (g)$ is:

Discussion

30.	HOCH2CH2CH2COOH on reaction with H+ forms
Answer» $H O C H_{2} C H_{2} C H_{2} C O O H$ on reaction with $H^{+}$ forms

Discussion

31.	There are __ chiral centres in Penicillin.
Answer» There are __ chiral centres in Penicillin.

Discussion

32.	What volume of air containing 21% of oxygen by volume is required to completely burn one kg of carbon that contains 15% of non-combustible substance?
Answer» What volume of air containing $21$ % of oxygen by volume is required to completely burn one kg of carbon that contains $15$ % of non-combustible substance?

Discussion

33.	The "sodium-potassium pump" pumps
Answer» The "sodium-potassium pump" pumps

Discussion

34.	A sample of 0.50 g of an organic compound was treated according to Kjeldahl’s method. The ammonia evolved was absorbed in 50 mL of 0.5 M H2SO4. The residual acid required 60 mL of 0.5 M solution of NaOH for neutralisation. Find the percentage composition of nitrogen in the compound.
Answer» A sample of 0.50 g of an organic compound was treated according to Kjeldahl’s method. The ammonia evolved was absorbed in 50 mL of 0.5 M $H_{2} S O_{4}$ . The residual acid required 60 mL of 0.5 M solution of NaOH for neutralisation. Find the percentage composition of nitrogen in the compound.

Discussion

35.	Non-stoichiometric cuprous oxide, Cu2O can be prepared in laboratory. In this oxide, copper to oxygen ratio is slightly less than 2 : 1. Can you account for the fact that this substance is a p - type semicondutor ?
Answer» Non-stoichiometric cuprous oxide, $C u_{2} O$ can be prepared in laboratory. In this oxide, copper to oxygen ratio is slightly less than 2 : 1. Can you account for the fact that this substance is a p - type semicondutor ?

Discussion

36.	Column 1 Column 2 Column 3 (Name of Vitamins) (Sources) (Deficiency diseases)(I)Vitamin−A(i)Curd(P)Increased blood clotting time(II)Vitamin−K(ii)Carrots(Q)Scurvy(III)Vitamin−B12(iii)Green leafy vegetables(R)Night−blindness(IV)Vitamin−C(iv)Amla(S)RBC deficiency in haemoglobin The only correct combination about the water soluble vitamin
Answer» $\begin{matrix} C o l u m n 1 & C o l u m n 2 & C o l u m n 3 (N a m e o f V i t a m i n s) & (S o u r c e s) & (D e f i c i e n c y d i s e a s e s) (I) & V i t a m i n - A & (i) & C u r d & (P) & I n c r e a s e d b l o o d c l o t t i n g t i m e (I I) & V i t a m i n - K & (i i) & C a r r o t s & (Q) & S c u r v y (I I I) & V i t a m i n - B_{12} & (i i i) & G r e e n l e a f y v e g e t a b l e s & (R) & N i g h t - b l i n d n e s s (I V) & V i t a m i n - C & (i v) & A m l a & (S) & R B C d e f i c i e n c y i n h a e m o g l o b i n \end{matrix}$ The only correct combination about the water soluble vitamin

Discussion

37.	2M solution of Na2CO3 is boiled in a closed container with excess of CaF2. Very little amount of CaCO3 and NaF are formed. If the solubility product (Ksp of CaCO3 is x and molar solubility of CaF2 is y, find the molar concentration of F− in resulting solution after equilibrium is attained.
Answer» $2 M$ solution of $N a_{2} C O_{3}$ is boiled in a closed container with excess of $C a F_{2} .$ Very little amount of $C a C O_{3}$ and $N a F$ are formed. If the solubility product $(K_{s p}$ of $C a C O_{3}$ is x and molar solubility of $C a F_{2}$ is y, find the molar concentration of $F^{-}$ in resulting solution after equilibrium is attained.

Discussion

38.	Which of the following relationship(s) is/are correct for a 1st order reaction?
Answer» Which of the following relationship(s) is/are correct for a $1^{s t}$ order reaction?

Discussion

39.	45.4 L of dinitrogen reacted with 22.7 L of dioxygen and 45.4 L of nitrous oxide was formed. The reaction is given below 2N2(g)+ O2(g)→2N2O (g) Which law is being obeyed in this experiment? write the statement of the law?
Answer» 45.4 L of dinitrogen reacted with 22.7 L of dioxygen and 45.4 L of nitrous oxide was formed. The reaction is given below $2 N_{2} (g) + O_{2} (g) \to 2 N_{2} O (g)$ Which law is being obeyed in this experiment? write the statement of the law?

39.

45.4 L of dinitrogen reacted with 22.7 L of dioxygen and 45.4 L of nitrous oxide was formed. The reaction is given below 2N2(g)+ O2(g)→2N2O (g) Which law is being obeyed in this experiment? write the statement of the law?

Answer»

45.4 L of dinitrogen reacted with 22.7 L of dioxygen and 45.4 L of nitrous oxide was formed. The reaction is given below

$2 N_{2} (g) + O_{2} (g) \to 2 N_{2} O (g)$

Which law is being obeyed in this experiment? write the statement of the law?

Discussion

40.	Three small identical bodies each of mass m are moving in circular orbit around a fixed point with same angular velocity under their gravitational interaction. If the separation between any two bodies is R, t he total energy possessed by the system is given by
Answer» Three small identical bodies each of mass m are moving in circular orbit around a fixed point with same angular velocity under their gravitational interaction. If the separation between any two bodies is R, t he total energy possessed by the system is given by

Discussion

41.	In the process shown in figure, the internal energy of an ideal gas decreases by 3P0V02 in going from point C to A. Heat transfer along the process CA is
Answer» In the process shown in figure, the internal energy of an ideal gas decreases by $\frac{3 P_{0} V_{0}}{2}$ in going from point C to A. Heat transfer along the process CA is

41.

In the process shown in figure, the internal energy of an ideal gas decreases by 3P0V02 in going from point C to A. Heat transfer along the process CA is

Answer»

In the process shown in figure, the internal energy of an ideal gas decreases by $\frac{3 P_{0} V_{0}}{2}$ in going from point C to A. Heat transfer along the process CA is

Discussion

42.	What is the second law of thermodynamics?
Answer» What is the second law of thermodynamics?

Discussion

43.	The Ksp of BaCrO4 is 2.4×10−10M2. The maximum concentration of Ba(NO3)2 possible without precipitation in a 6×10−4MK2CrO4 solution is ?
Answer» The Ksp of $B a C r O_{4}$ is $2.4 \times 10^{- 10} M^{2}$ . The maximum concentration of $B a (N O_{3})_{2}$ possible without precipitation in a $6 \times 10^{- 4} M K_{2} C r O_{4}$ solution is ?

Discussion

44.	Look at this enamine: Which of the following sequence converts benzaldehyde into the given enamine? 1: Oxidation with Cr(VI) compound 2: reaction with pyrrolidine with pH control; acid catalyst 3: MeMgBr followed by H3O+
Answer» Look at this enamine: Which of the following sequence converts benzaldehyde into the given enamine? 1: Oxidation with Cr(VI) compound 2: reaction with pyrrolidine with pH control; acid catalyst 3: $M e M g B r f o l l o w e d b y H_{3} O^{+}$

Discussion

45.	The species that do not contain peroxide ions are
Answer» The species that do not contain peroxide ions are

Discussion

46.	A 2.8 g of mixture of carbonates of two monovalent metals are heated to corresponding oxides and carbondioixde. The metal A is 20 % by weight. The mass of carbondioxide obtained from the reaction is 0.88 g. The mass of the metal B in the mixture is
Answer» A $2.8 g$ of mixture of carbonates of two monovalent metals are heated to corresponding oxides and carbondioixde. The metal $A$ is $20 %$ by weight. The mass of carbondioxide obtained from the reaction is $0.88 g$ . The mass of the metal $B$ in the mixture is

Discussion

47.	QUESTION 14.1 What are monosaccharides?
Answer» QUESTION 14.1 What are monosaccharides?

47.

QUESTION 14.1 What are monosaccharides?

Answer»

QUESTION 14.1

What are monosaccharides?

Discussion

48.	A research guide instructed his two students to synthesize complex [Co(NH3)5(NO2)]Cl2 They synthesized the complexes with identical molecular formula, molar mass, geometry, conductance and spin, but they differed in colour. Bases on the above facts the following question. (ii) Which of the ligands can show ambient property?
Answer» A research guide instructed his two students to synthesize complex $[C o (N H_{3})_{5} (N O_{2})] C l_{2}$ They synthesized the complexes with identical molecular formula, molar mass, geometry, conductance and spin, but they differed in colour. Bases on the above facts the following question. (ii) Which of the ligands can show ambient property?

48.

A research guide instructed his two students to synthesize complex [Co(NH3)5(NO2)]Cl2 They synthesized the complexes with identical molecular formula, molar mass, geometry, conductance and spin, but they differed in colour. Bases on the above facts the following question. (ii) Which of the ligands can show ambient property?

Answer»

A research guide instructed his two students to synthesize complex
$[C o (N H_{3})_{5} (N O_{2})] C l_{2}$
They synthesized the complexes with identical molecular formula, molar mass, geometry, conductance and spin, but they differed in colour. Bases on the above facts the following question.

(ii) Which of the ligands can show ambient property?

Discussion

49.	The molality of a solution with x% mass by vol of H2SO4 solution is equal to 9 m. The weight of the solvent present in 1 L of this solution is 900 gm. What is the value of x?
Answer» The molality of a solution with x% mass by vol of $H_{2} S O_{4}$ solution is equal to 9 m. The weight of the solvent present in 1 L of this solution is 900 gm. What is the value of x?

Discussion

50.	In which of the following reactions does hydrogen act as an oxidising agent ?
Answer» In which of the following reactions does hydrogen act as an oxidising agent ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Among the following acids which has the lowest pKa value?

The major product formed when 2-butene is reacted with O3 followed by treatment with Zn/H2O is:

The element whose salts cannot be detected by flame test is:

Which one of the following has the most nucleophilic nitrogen ?

Carbon percentage is maximum in [BHU 1998]

In an atom, an electron is moving with a speed of 600 sec−1 with a accuracy of 0.005%, certainity with which the position of electron can be located is

In the conversion NH2OH⟶N2O the equivalent weight of NH2OH will be

The number of unit cells in 58.5g of NaCl is nearly [MP PMT 2000, 01]

In a single hydrogen atom, the electron is excited to its 6th orbit. The maximum no. of distinct lines possible, when it comes to the ground state is:

The freezing point of 1 m NaCl solution, assuming NaCl to be 100% dissociated in water

For the above reaction , the major product (A) is :

Bromine is obtained on commercial scale from

The correct order of hydration enthalpies of alkali metal ions is:

A 40.0 mL solution of a weak base, BOH is titrated with 0.1 N HCl solution. The pH of the solution is found to be 10.04 and 9.14 after adding 5.0 mL and 20.0 mL of the acid respectively. The dissociation constant of the base is:

Aniline in a set of the following reactions yielded a coloured product ‘Y’.Compound Y is:

In the reaction: Cr2O3+Na2CO3+KNO3⟶Na2CrO4+CO2+KNO2 sum of equivalent weights of KNO2 and Na2CrO4 produced is .

A gas formed by the action of alcoholic KOH on ethyl iodide, decolorizes alkaline KMnO4 solution. The gas is

What is the oxidation number of Nitrogen in NO3−1 ion?

Describe the change in hybridisation (if any) of the Al atom in the following reaction. AlCl3+Cl−→AlCl−4

Calculate the number of photons emitted per second by a 10 W sodium vapour lamp. Assume that 60 % of the consumed energy is converted into light. Wavelength of sodium light = 590 nm.

Which one of the following compound is not a protonic acid

A white substance having alkaline nature in solution is

450 mL of a strong acid solution of pH = 2.0 is mixed with 550 mL of another acid solution of pH = 3.0. The pH of resultant solution is

Ozonolysis of which one of the following will give two molecules of acetaldehyde

Which of the following is a bicyclo compounds?

Specify the co-ordination geometry around and hybridization of N and B-atoms in a 1 : 1 complex of BF3 and NH3:

Calculate the hydrolysis constant of a salt containing NO−2 ion. If Ka for HNO2=4.5×10−10.

The elevation in boiling point of a solution of 13.44g of CuCl2 in 1kg of water using the following information will be (Molecular weight of CuCl2= 134.4 and Kb­= 0.52K molal-1)

The equilibrium constant for the reaction, 2SO2(g)+O2(g)⇌2SO3(g) is 256 at 1000K. The equilibrium constant for the reaction SO3(g)⇌SO2(g)+12O2(g) is:

HOCH2CH2CH2COOH on reaction with H+ forms

There are __ chiral centres in Penicillin.

What volume of air containing 21% of oxygen by volume is required to completely burn one kg of carbon that contains 15% of non-combustible substance?

The "sodium-potassium pump" pumps

A sample of 0.50 g of an organic compound was treated according to Kjeldahl’s method. The ammonia evolved was absorbed in 50 mL of 0.5 M H2SO4. The residual acid required 60 mL of 0.5 M solution of NaOH for neutralisation. Find the percentage composition of nitrogen in the compound.

Non-stoichiometric cuprous oxide, Cu2O can be prepared in laboratory. In this oxide, copper to oxygen ratio is slightly less than 2 : 1. Can you account for the fact that this substance is a p - type semicondutor ?

2M solution of Na2CO3 is boiled in a closed container with excess of CaF2. Very little amount of CaCO3 and NaF are formed. If the solubility product (Ksp of CaCO3 is x and molar solubility of CaF2 is y, find the molar concentration of F− in resulting solution after equilibrium is attained.

Which of the following relationship(s) is/are correct for a 1st order reaction?

45.4 L of dinitrogen reacted with 22.7 L of dioxygen and 45.4 L of nitrous oxide was formed. The reaction is given below 2N2(g)+ O2(g)→2N2O (g) Which law is being obeyed in this experiment? write the statement of the law?

Three small identical bodies each of mass m are moving in circular orbit around a fixed point with same angular velocity under their gravitational interaction. If the separation between any two bodies is R, t he total energy possessed by the system is given by

In the process shown in figure, the internal energy of an ideal gas decreases by 3P0V02 in going from point C to A. Heat transfer along the process CA is

What is the second law of thermodynamics?

The Ksp of BaCrO4 is 2.4×10−10M2. The maximum concentration of Ba(NO3)2 possible without precipitation in a 6×10−4MK2CrO4 solution is ?

Look at this enamine: Which of the following sequence converts benzaldehyde into the given enamine? 1: Oxidation with Cr(VI) compound 2: reaction with pyrrolidine with pH control; acid catalyst 3: MeMgBr followed by H3O+

The species that do not contain peroxide ions are

A 2.8 g of mixture of carbonates of two monovalent metals are heated to corresponding oxides and carbondioixde. The metal A is 20 % by weight. The mass of carbondioxide obtained from the reaction is 0.88 g. The mass of the metal B in the mixture is

QUESTION 14.1 What are monosaccharides?

The molality of a solution with x% mass by vol of H2SO4 solution is equal to 9 m. The weight of the solvent present in 1 L of this solution is 900 gm. What is the value of x?

In which of the following reactions does hydrogen act as an oxidising agent ?

The elevation in boiling point of a solution of 13.44g of CuCl2 in 1kg of water using the following information will be (Molecular weight of CuCl2= 134.4 and Kb= 0.52K molal-1)