46295 + Interview Questions in Chemistry

1.	Rhombic sulphur consists of which molecule?
Answer» Rhombic sulphur consists of which molecule?

Discussion

2.	Positive Tollens' test is observed for:
Answer» Positive Tollens' test is observed for:

Discussion

3.	Which of the following is not correct? (a) Δ G is zero for a reversible reaction. (b) Δ G is positive for a spontaneous reaction. (c) Δ G is negative for a spontaneous reaction. (d) Δ G is positive for a non-spontaneous reaction.
Answer» Which of the following is not correct? (a) $Δ$ G is zero for a reversible reaction. (b) $Δ$ G is positive for a spontaneous reaction. (c) $Δ$ G is negative for a spontaneous reaction. (d) $Δ$ G is positive for a non-spontaneous reaction.

Discussion

4.	What is the difference between the law of definite proportion and law of multiple proportions?
Answer» What is the difference between the law of definite proportion and law of multiple proportions?

Discussion

5.	Explain giving reasons : Transition metals and many of their compounds show paramagnetic behaviour. The enthalpies of atomisation of the transition metals are high. The transition metals generally form coloured compounds. Transition metals and their many compounds act as good catalyst.
Answer» Explain giving reasons : Transition metals and many of their compounds show paramagnetic behaviour. The enthalpies of atomisation of the transition metals are high. The transition metals generally form coloured compounds. Transition metals and their many compounds act as good catalyst.

5.

Explain giving reasons : Transition metals and many of their compounds show paramagnetic behaviour. The enthalpies of atomisation of the transition metals are high. The transition metals generally form coloured compounds. Transition metals and their many compounds act as good catalyst.

Answer»

Explain giving reasons :
Transition metals and many of their compounds show paramagnetic behaviour.

The enthalpies of atomisation of the transition metals are high.

The transition metals generally form coloured compounds.

Transition metals and their many compounds act as good catalyst.

Discussion

6.	Given, resonating structures of phenol : Choose the correct order of stability of these structures:
Answer» Given, resonating structures of phenol : Choose the correct order of stability of these structures:

Discussion

7.	SN1 solvolysis of 4-bromopent-2-ene in ethanol gives:
Answer» $S_{N} 1$ solvolysis of 4-bromopent-2-ene in ethanol gives:

Discussion

8.	Lattice dissociation energies of BeF2,MgF2,CaF2 and BaF2 2906, 2610, 2459 and 2367 kJ/mol Respectively. Hydration energies Be2+,Mg2+,Ca2+,Ba2+ and F−−2494,−1921,−1577,−1305 and -457 kJ mol respectively. Which of the fluorides is not soluble in water?
Answer» Lattice dissociation energies of $B e F_{2}, M g F_{2}, C a F_{2}$ and $B a F_{2}$ 2906, 2610, 2459 and 2367 kJ/mol Respectively. Hydration energies $B e^{2 +}, M g^{2 +}, C a^{2 +}, B a^{2 +}$ and $F^{-} - 2494, - 1921, - 1577, - 1305$ and -457 kJ mol respectively. Which of the fluorides is not soluble in water?

Discussion

9.	In the laboratory, sodium chloride is made by burning the sodium in the atmosphere of chlorine which is yellow in colour. The cause of yellow colour is
Answer» In the laboratory, sodium chloride is made by burning the sodium in the atmosphere of chlorine which is yellow in colour. The cause of yellow colour is

Discussion

10.	pH calculation upon dilution of a strong acid solution is generally done by equating nH+ in original solution and diluted solution. However, if strong acid solution is very dilute, then H+ from water are also to be considered. Take log3.7 = 0.568 and answer the following questions. A litre solution of pH = 6 (solution of a strong acid) is added to the 73 litre of water. What is the pH of resulting solution? Neglect the common ion effect on H2O.
Answer» pH calculation upon dilution of a strong acid solution is generally done by equating $n_{H^{+}}$ in original solution and diluted solution. However, if strong acid solution is very dilute, then $H^{+}$ from water are also to be considered. Take log3.7 = 0.568 and answer the following questions. A litre solution of pH = 6 (solution of a strong acid) is added to the $\frac{7}{3}$ litre of water. What is the pH of resulting solution? Neglect the common ion effect on $H_{2} O$ .

10.

pH calculation upon dilution of a strong acid solution is generally done by equating nH+ in original solution and diluted solution. However, if strong acid solution is very dilute, then H+ from water are also to be considered. Take log3.7 = 0.568 and answer the following questions. A litre solution of pH = 6 (solution of a strong acid) is added to the 73 litre of water. What is the pH of resulting solution? Neglect the common ion effect on H2O.

Answer»

pH calculation upon dilution of a strong acid solution is generally done by equating $n_{H^{+}}$ in original solution and diluted solution. However, if strong acid solution is very dilute, then $H^{+}$ from water are also to be considered. Take log3.7 = 0.568 and answer the following questions.

A litre solution of pH = 6 (solution of a strong acid) is added to the $\frac{7}{3}$ litre of water. What is the pH of resulting solution? Neglect the common ion effect on $H_{2} O$ .

Discussion

11.	The following sequence of reactions on A gives
Answer» The following sequence of reactions on A gives

Discussion

12.	The formula of the compound which gives violet colour in Lassiagne’s test for sulphur with sodium nitroprusside is
Answer» The formula of the compound which gives violet colour in Lassiagne’s test for sulphur with sodium nitroprusside is

Discussion

13.	A new carbon-carbon bond formation is possible in
Answer» A new carbon-carbon bond formation is possible in

Discussion

14.	CH3−C≡C−CH3BH3, THF−−−−−−−→CH3COOHMajor product
Answer» $C H_{3} - C \equiv C - C H_{3} B H_{3}, T H F - ------ \to C H_{3} C O O H Major product$

Discussion

15.	Borax bead test is not given by
Answer» Borax bead test is not given by

Discussion

16.	Choose the complex having the IUPAC name sodium hexanitrito -N- cobaltate(III):
Answer» Choose the complex having the IUPAC name sodium hexanitrito -N- cobaltate(III):

Discussion

17.	There are three boxes, one contains only apples, one contains only oranges, and one contains both apples and oranges. The boxes have been incorrectly labeled such that no label identifies the actual contents of the box it labels. Opening just one box, and without looking in the box, you take out one piece of fruit. By looking at the fruit, you can immediately label all of the boxes correctly. Which box did you open?
Answer» There are three boxes, one contains only apples, one contains only oranges, and one contains both apples and oranges. The boxes have been incorrectly labeled such that no label identifies the actual contents of the box it labels. Opening just one box, and without looking in the box, you take out one piece of fruit. By looking at the fruit, you can immediately label all of the boxes correctly. Which box did you open?

Discussion

18.	The enthalpy and entropy change for a chemical reaction are –2.5×103 cal and 7.4 cal deg–1 respectively. The reaction at 298 K will be:
Answer» The enthalpy and entropy change for a chemical reaction are $- 2.5 \times 10^{3}$ cal and 7.4 cal $d e g^{- 1}$ respectively. The reaction at 298 K will be:

Discussion

19.	Which of the following is the weakest acid? (pKa values given at 25oC)
Answer» Which of the following is the weakest acid? ( $p K_{a}$ values given at $25^{o} C$ )

Discussion

20.	The electrons in a particle beam each have a kinetic energy of 1.6×10−7J. What are the magnitude and direction of the electric field that stops these electrons in a distance of 10.0cm
Answer» The electrons in a particle beam each have a kinetic energy of $1.6 \times 10^{- 7} J$ . What are the magnitude and direction of the electric field that stops these electrons in a distance of 10.0cm

Discussion

21.	Which one of the following is the first popular artificial sweeteners?
Answer» Which one of the following is the first popular artificial sweeteners?

Discussion

22.	Compounds having reacts rapidly with halogen in the presence of a base to form halo form. The reaction is known as halo form Which of the following is correct comparison of rate of halo form reaction with various halogens
Answer» Compounds having reacts rapidly with halogen in the presence of a base to form halo form. The reaction is known as halo form Which of the following is correct comparison of rate of halo form reaction with various halogens

Discussion

23.	Why is Wurtz reaction not preferred for the preparation of alkanes containing odd number of carbon atoms? Illustrate your answer by taking one example.
Answer» Why is Wurtz reaction not preferred for the preparation of alkanes containing odd number of carbon atoms? Illustrate your answer by taking one example.

Discussion

24.	Chemisorption decreases with increase in pressure. Why?
Answer» Chemisorption decreases with increase in pressure. Why?

Discussion

25.	Protein found in a biological system with a unique three-dimensional structure and biological activity is called a native protein. When a protein in its native form, is subjected to a physical change like change in temperature or a chemical change like, change like, change in PH, denaturation of protein takes place. Explain in the cause.
Answer» Protein found in a biological system with a unique three-dimensional structure and biological activity is called a native protein. When a protein in its native form, is subjected to a physical change like change in temperature or a chemical change like, change like, change in PH, denaturation of protein takes place. Explain in the cause.

Discussion

26.	Arrange the following in decreasing order of their reactivity towards nucleophilic addition reaction. CH3COCH3, CH3CH2CHO, HCHO, (CH3)2CHCHO
Answer» Arrange the following in decreasing order of their reactivity towards nucleophilic addition reaction. CH₃COCH₃, CH₃CH₂CHO, HCHO, (CH₃)₂CHCHO

26.

Arrange the following in decreasing order of their reactivity towards nucleophilic addition reaction. CH3COCH3, CH3CH2CHO, HCHO, (CH3)2CHCHO

Answer»

Arrange the following in decreasing order of their reactivity towards nucleophilic addition reaction.

CH₃COCH₃, CH₃CH₂CHO, HCHO, (CH₃)₂CHCHO

Discussion

27.	How many electrons can fit in the orbital for which n=3, l=1?
Answer» How many electrons can fit in the orbital for which n=3, l=1?

Discussion

28.	What is the number of atoms present in 4.25 grams of NH3 is approximately??
Answer» What is the number of atoms present in 4.25 grams of $N H_{3}$ is approximately??

Discussion

29.	Consider a system containing one mole of a diatomic gas, contained by a piston. What is the temperature change of the gas, if q=50J and W=−100 J? (Given Cv=52R )
Answer» Consider a system containing one mole of a diatomic gas, contained by a piston. What is the temperature change of the gas, if $q = 50 J$ and $W = - 100 J ?$ (Given $C_{v} = \frac{5}{2} R$ )

Discussion

30.	The degree of hydrolysis and pH of 0.1 M sodium acetate solution are: Hydrolysis constant of sodium acetate is 5.6 × 10−10.
Answer» The degree of hydrolysis and pH of $0.1 M$ sodium acetate solution are: Hydrolysis constant of sodium acetate is $5.6 \times 10^{- 10}$ .

Discussion

31.	Which of the following is an example of nucleophilic addition ?
Answer» Which of the following is an example of nucleophilic addition ?

Discussion

32.	Why Gay lussac's law is only obeyed by the gases
Answer» Why Gay lussac's law is only obeyed by the gases

Discussion

33.	In the reaction xBrO−3+yCr3++zH2O→Br2+HCrO−4+H+, the value of ‘x’ is ___
Answer» In the reaction $x B r O_{3}^{-} + y C r^{3 +} + z H_{2} O \to B r_{2} + H C r O_{4}^{-} + H^{+}$ , the value of ‘x’ is ___

Discussion

34.	Can nuclei acid, protein and starch be considered as step growth polymers?
Answer» Can nuclei acid, protein and starch be considered as step growth polymers?

Discussion

35.	For the given reaction : The major product is :
Answer» For the given reaction : The major product is :

Discussion

36.	Can we achieve 100% efficiency from an engine by making the processes reversible?
Answer» Can we achieve 100% efficiency from an engine by making the processes reversible?

Discussion

37.	The solution of a salt of a weak acid and weak base will have pH - (Kb = 10−6 ; Ka = 10−4)
Answer» The solution of a salt of a weak acid and weak base will have $p H$ - ( $K_{b}$ = $10^{- 6}$ ; $K_{a}$ = $10^{- 4}$ )

37.

The solution of a salt of a weak acid and weak base will have pH - (Kb = 10−6 ; Ka = 10−4)

Answer»

The solution of a salt of a weak acid and weak base will have $p H$ -

( $K_{b}$ = $10^{- 6}$ ; $K_{a}$ = $10^{- 4}$ )

Discussion

38.	Which of the following kingdoms are not included under the domain Eukarya?
Answer» Which of the following kingdoms are not included under the domain Eukarya?

Discussion

39.	Which of the following cannot exist.
Answer» Which of the following cannot exist.

Discussion

40.	Which of the following statements in not correct?
Answer» Which of the following statements in not correct?

Discussion

41.	Select the most stable carbocation among the following?
Answer» Select the most stable carbocation among the following?

Discussion

42.	The number of σ and π bonds in a molecule of benzene is
Answer» The number of $σ$ and $π$ bonds in a molecule of benzene is

42.

The number of σ and π bonds in a molecule of benzene is

Answer»

The number of $σ$ and $π$ bonds in a molecule of benzene is

Discussion

43.	Does gases present in the atmosphere could be differentiated into ideal and real gases?
Answer» Does gases present in the atmosphere could be differentiated into ideal and real gases?

Discussion

44.	Which of the following is a pair of isodiaphers?
Answer» Which of the following is a pair of isodiaphers?

Discussion

45.	A copper strip is heated strongly in Bunsen flame till it ceases to impart any greenish or bluish flame, then a pinch of organic halide is placed on this hot strip and reintroduced into the flame, if a green or bluish green flame reappears it indicates the presence of halogen but does not confirm the nature of halogen. This test is
Answer» A copper strip is heated strongly in Bunsen flame till it ceases to impart any greenish or bluish flame, then a pinch of organic halide is placed on this hot strip and reintroduced into the flame, if a green or bluish green flame reappears it indicates the presence of halogen but does not confirm the nature of halogen. This test is

Discussion

46.	Identify the correct formula of halides of alkaline earth metals from the following . (a) BaCl2.2H2O (b) BaCl2 (c) CaCl2.6h2O (d) SrCl2.4H2O
Answer» Identify the correct formula of halides of alkaline earth metals from the following . (a) $B a C l_{2} . 2 H_{2} O$ (b) $B a C l_{2}$ (c) $C a C l_{2} . 6 h_{2} O$ (d) $S r C l_{2} . 4 H_{2} O$

Discussion

47.	Compressibility factor, Z of a gas is given as Z=pVnRT (i) What is the value of Z for an ideal gas? (ii) For real gas what will be the effect on value of Z above Boyle's temperature?
Answer» Compressibility factor, Z of a gas is given as $Z = \frac{p V}{n R T}$ (i) What is the value of Z for an ideal gas? (ii) For real gas what will be the effect on value of Z above Boyle's temperature?

47.

Compressibility factor, Z of a gas is given as Z=pVnRT (i) What is the value of Z for an ideal gas? (ii) For real gas what will be the effect on value of Z above Boyle's temperature?

Answer»

Compressibility factor, Z of a gas is given as $Z = \frac{p V}{n R T}$

(i) What is the value of Z for an ideal gas?

(ii) For real gas what will be the effect on value of Z above Boyle's temperature?

Discussion

48.	In LiF, the structure of F− is
Answer» In LiF, the structure of $F^{-}$ is

Discussion

49.	Q18. Consider the following Statements regarding National Water Development Agency: 1. The National Water Development Agency (NWDA) was established to study the feasibility of the links under peninsular component of National Perspective Plan. 2. It is under the Ministry of Water Resources, River Development and Ganga Rejuvenation Identify the correct statements:
Answer» Q18. Consider the following Statements regarding National Water Development Agency: 1. The National Water Development Agency (NWDA) was established to study the feasibility of the links under peninsular component of National Perspective Plan. 2. It is under the Ministry of Water Resources, River Development and Ganga Rejuvenation Identify the correct statements:

49.

Q18. Consider the following Statements regarding National Water Development Agency: 1. The National Water Development Agency (NWDA) was established to study the feasibility of the links under peninsular component of National Perspective Plan. 2. It is under the Ministry of Water Resources, River Development and Ganga Rejuvenation Identify the correct statements:

Answer»

Q18. Consider the following Statements regarding National Water Development Agency:

1. The National Water Development Agency (NWDA) was established to study the feasibility of the links under peninsular component of National Perspective Plan.

2. It is under the Ministry of Water Resources, River Development and Ganga Rejuvenation

Identify the correct statements:

Discussion

50.	The bond between chlorine and bromine is
Answer» The bond between chlorine and bromine is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Rhombic sulphur consists of which molecule?

Positive Tollens' test is observed for:

Which of the following is not correct? (a) Δ G is zero for a reversible reaction. (b) Δ G is positive for a spontaneous reaction. (c) Δ G is negative for a spontaneous reaction. (d) Δ G is positive for a non-spontaneous reaction.

What is the difference between the law of definite proportion and law of multiple proportions?

Explain giving reasons : Transition metals and many of their compounds show paramagnetic behaviour. The enthalpies of atomisation of the transition metals are high. The transition metals generally form coloured compounds. Transition metals and their many compounds act as good catalyst.

Given, resonating structures of phenol : Choose the correct order of stability of these structures:

SN1 solvolysis of 4-bromopent-2-ene in ethanol gives:

Lattice dissociation energies of BeF2,MgF2,CaF2 and BaF2 2906, 2610, 2459 and 2367 kJ/mol Respectively. Hydration energies Be2+,Mg2+,Ca2+,Ba2+ and F−−2494,−1921,−1577,−1305 and -457 kJ mol respectively. Which of the fluorides is not soluble in water?

In the laboratory, sodium chloride is made by burning the sodium in the atmosphere of chlorine which is yellow in colour. The cause of yellow colour is

The following sequence of reactions on A gives

The formula of the compound which gives violet colour in Lassiagne’s test for sulphur with sodium nitroprusside is

A new carbon-carbon bond formation is possible in

CH3−C≡C−CH3BH3, THF−−−−−−−→CH3COOHMajor product

Borax bead test is not given by

Choose the complex having the IUPAC name sodium hexanitrito -N- cobaltate(III):

The enthalpy and entropy change for a chemical reaction are –2.5×103 cal and 7.4 cal deg–1 respectively. The reaction at 298 K will be:

Which of the following is the weakest acid? (pKa values given at 25oC)

The electrons in a particle beam each have a kinetic energy of 1.6×10−7J. What are the magnitude and direction of the electric field that stops these electrons in a distance of 10.0cm

Which one of the following is the first popular artificial sweeteners?

Compounds having reacts rapidly with halogen in the presence of a base to form halo form. The reaction is known as halo form Which of the following is correct comparison of rate of halo form reaction with various halogens

Why is Wurtz reaction not preferred for the preparation of alkanes containing odd number of carbon atoms? Illustrate your answer by taking one example.

Chemisorption decreases with increase in pressure. Why?

Arrange the following in decreasing order of their reactivity towards nucleophilic addition reaction. CH3COCH3, CH3CH2CHO, HCHO, (CH3)2CHCHO

How many electrons can fit in the orbital for which n=3, l=1?

What is the number of atoms present in 4.25 grams of NH3 is approximately??

Consider a system containing one mole of a diatomic gas, contained by a piston. What is the temperature change of the gas, if q=50J and W=−100 J? (Given Cv=52R )

The degree of hydrolysis and pH of 0.1 M sodium acetate solution are: Hydrolysis constant of sodium acetate is 5.6 × 10−10.

Which of the following is an example of nucleophilic addition ?

Why Gay lussac's law is only obeyed by the gases

In the reaction xBrO−3+yCr3++zH2O→Br2+HCrO−4+H+, the value of ‘x’ is ___

Can nuclei acid, protein and starch be considered as step growth polymers?

For the given reaction : The major product is :

Can we achieve 100% efficiency from an engine by making the processes reversible?

The solution of a salt of a weak acid and weak base will have pH - (Kb = 10−6 ; Ka = 10−4)

Which of the following kingdoms are not included under the domain Eukarya?

Which of the following cannot exist.

Which of the following statements in not correct?

Select the most stable carbocation among the following?

The number of σ and π bonds in a molecule of benzene is

Does gases present in the atmosphere could be differentiated into ideal and real gases?

Which of the following is a pair of isodiaphers?

Identify the correct formula of halides of alkaline earth metals from the following . (a) BaCl2.2H2O (b) BaCl2 (c) CaCl2.6h2O (d) SrCl2.4H2O

Compressibility factor, Z of a gas is given as Z=pVnRT (i) What is the value of Z for an ideal gas? (ii) For real gas what will be the effect on value of Z above Boyle's temperature?

In LiF, the structure of F− is

The bond between chlorine and bromine is