46295 + Interview Questions in Chemistry

1.	Given the bond energies N ≡ N, H − H and N − H bonds are 945,436 and 391 kJ mole−1 respectively, the enthalpy of the following reaction N2(g) + 3H2(g) → 2NH3(g) is
Answer» Given the bond energies $N \equiv N$ , $H - H$ and $N - H$ bonds are $945, 436$ and $391 k J m o l e^{- 1}$ respectively, the enthalpy of the following reaction $N_{2} (g) + 3 H_{2} (g) \to 2 N H_{3} (g)$ is

Discussion

2.	Proteins are hydrolysed by enzymes into
Answer» Proteins are hydrolysed by enzymes into

Discussion

3.	What should be the considerations during the extraction of metals by electrochemical method?
Answer» What should be the considerations during the extraction of metals by electrochemical method?

Discussion

4.	Of the four oxyacids of chlorine the strongest oxidising agent in dilute aqueous solution is
Answer» Of the four oxyacids of chlorine the strongest oxidising agent in dilute aqueous solution is

Discussion

5.	Which is best description of the behaviour of bromine in the reaction given below? H2O+Br2→HOBr+HBr
Answer» Which is best description of the behaviour of bromine in the reaction given below? $H_{2} O + B r_{2} \to H O B r + H B r$

Discussion

6.	The formation of micelles takes places above a particular temperature, called as:
Answer» The formation of micelles takes places above a particular temperature, called as:

Discussion

7.	If the wavelength of the first line of Balmer series of hydrogen is 6561 ˚A, the wavelength of the second line of the same series will be,
Answer» If the wavelength of the first line of Balmer series of hydrogen is $6561 ˚ A$ , the wavelength of the second line of the same series will be,

Discussion

8.	What are the applications of Kohlrausch law?
Answer» What are the applications of Kohlrausch law?

Discussion

9.	2. For a first order reaction calculate the ratio between the time taken to complete three fourth of the reaction and the time taken to complete half of the reaction.
Answer» 2. For a first order reaction calculate the ratio between the time taken to complete three fourth of the reaction and the time taken to complete half of the reaction.

Discussion

10.	4.What are α rays and β rays?
Answer» 4.What are α rays and β rays?

Discussion

11.	How many geometrical isomers are possible in the followingcoordination entities?(i) [Cr(C2O4)3]3−(ii) [Co(NH3)3Cl3]
Answer» How many geometrical isomers are possible in the following coordination entities? (i) [Cr(C₂O₄)₃]³⁻ (ii) [Co(NH₃)₃Cl₃]

11.

How many geometrical isomers are possible in the followingcoordination entities?(i) [Cr(C2O4)3]3−(ii) [Co(NH3)3Cl3]

Answer»

How many geometrical isomers are possible in the following
coordination entities?

(i) [Cr(C₂O₄)₃]³⁻
(ii) [Co(NH₃)₃Cl₃]

Discussion

12.	If the degree of dissociation of water at 70oC is 1.28×10−8. Then what is the ionic product of water at this temperature?
Answer» If the degree of dissociation of water at $70^{o} C$ is $1.28 \times 10^{- 8}$ . Then what is the ionic product of water at this temperature?

Discussion

13.	How can youdifferentiate between addition and condensation polymerisation?
Answer» How can you differentiate between addition and condensation polymerisation?

Discussion

14.	Total volume of atoms present in a face centred cubic unit cell of a metal is (r = radius of atom).
Answer» Total volume of atoms present in a face centred cubic unit cell of a metal is (r = radius of atom).

Discussion

15.	25. a. if given compound is treated with NaBH4 then what product will be formed? b. if given compound is treated with LiAlH4 then what product will be formed?
Answer» 25. a. if given compound is treated with NaBH4 then what product will be formed? b. if given compound is treated with LiAlH4 then what product will be formed?

Discussion

16.	The hydrolysis of an ester was carried out separately with 0.05M HCl and 0.05 M H2SO4. Which of the following will be true (A) K(HCI) > K(H2SO4) (B) K(HCI) < K(H2SO4) (C) K(HCI) = K(H2SO4)(D) K(HCI) = 2 K(H2SO4) here K is rate constant
Answer» The hydrolysis of an ester was carried out separately with 0.05M HCl and 0.05 M H2SO4. Which of the following will be true (A) K(HCI) > K(H2SO4) (B) K(HCI) < K(H2SO4) (C) K(HCI) = K(H2SO4)(D) K(HCI) = 2 K(H2SO4) here K is rate constant

Discussion

17.	The major product of the following addition reaction is:H3C−CH=CHBr2+H2O−−−−−−→
Answer» The major product of the following addition reaction is: $H_{3} C - C H = C H B r_{2} + H_{2} O - ----- \to$

Discussion

18.	Conjugate base of HCO−3 is:
Answer» Conjugate base of $H C O_{3}^{-}$ is:

Discussion

19.	Urea reacts with water to form A which will decompose to form B. B when passed through Co3+ (aq), yellow coloured solution C is formed. What is the formula of C from the following?
Answer» Urea reacts with water to form $A$ which will decompose to form $B$ . $B$ when passed through $C o^{3 +} (aq)$ , yellow coloured solution $C$ is formed. What is the formula of $C$ from the following?

Discussion

20.

The optical rotations of sucrose in 0.5 M HCl at 35o C at various time intervals are given below. The reaction of sucrose with HCl follows first order reaction. Find the rate constant of the given reaction. Time (minutes)010203040∞Rotation (degrees)+32.4+28.8+25.5+22.4+19.6-11.1 Take, ln1.09=0.086

Answer»

The optical rotations of sucrose in $0.5 M H C l$ at $35^{o} C$ at various time intervals are given below. The reaction of sucrose with HCl follows first order reaction. Find the rate constant of the given reaction.

Time (minutes)	0	10	20	30	40	$\infty$
Rotation (degrees)	+32.4	+28.8	+25.5	+22.4	+19.6	-11.1

Take,

l n 1.09 = 0.086

Discussion

21.	Saccharic acid is obtained by oxidation of glucose. The sum of number of C, H and O present in saccharic acid is/are :
Answer» Saccharic acid is obtained by oxidation of glucose. The sum of number of C, H and O present in saccharic acid is/are :

Discussion

22.	The solubilities of AgCl in water, 0.01 M CaCl2, 0.01 M NaCl and 0.05 M AgNO3 are denoted by S1, S2, S3, S4 respectively. Which of the following relationships are correct? Ksp=1.8×10−10
Answer» The solubilities of $A g C l$ in water, 0.01 M $C a C l_{2}$ , 0.01 M $N a C l$ and 0.05 M $A g N O_{3}$ are denoted by $S_{1}, S_{2}, S_{3}, S_{4}$ respectively. Which of the following relationships are correct? $K_{s p} = 1.8 \times 10^{- 10}$

Discussion

23.	The compound most likely to decolourize a solution of potassium permanganate is
Answer» The compound most likely to decolourize a solution of potassium permanganate is

Discussion

24.	63.At what temperature R.M.S. velocity of oxygen will be half as that of methane at 27^° C Options: 54^° C 300 K 600 K 327 K
Answer» 63.At what temperature R.M.S. velocity of oxygen will be half as that of methane at 27^° C Options: 54^° C 300 K 600 K 327 K

Discussion

25.	Sort out following halogens in decreasing order of their leaving capacity in SN2 reaction
Answer» Sort out following halogens in decreasing order of their leaving capacity in $S_{N} 2$ reaction

Discussion

26.	Temperature of source is 330∘C. Temperature of sink is changed in order to increase the efficiency of engine from 15 to 14, by
Answer» Temperature of source is $330^{\circ} C$ . Temperature of sink is changed in order to increase the efficiency of engine from $\frac{1}{5}$ to $\frac{1}{4}$ , by

Discussion

27.	Carbon-60 contains
Answer» Carbon-60 contains

Discussion

28.	If the enthalpies of formation of C3H8, CO2, H2O at standard conditions are -104kJ/mol, -394kJ/mol, -286kJ/mol respectively then the standard enthalpy of combustion of 66g of C3H8 will be(1) -2222 kJ(2) -2500 kJ(3) -784 kJ(4) -3333 kJ
Answer» If the enthalpies of formation of C3H8, CO2, H2O at standard conditions are -104kJ/mol, -394kJ/mol, -286kJ/mol respectively then the standard enthalpy of combustion of 66g of C3H8 will be (1) -2222 kJ (2) -2500 kJ (3) -784 kJ (4) -3333 kJ

Discussion

29.	The reactivity of different nucleophiles (NH−2,CH3COO−,OH−) is in the order:
Answer» The reactivity of different nucleophiles $(N H_{2}^{-}, C H_{3} C O O^{-}, O H^{-})$ is in the order:

Discussion

30.	Q. The enthalpy change during the reactionA2(g) + B2(g) → 2AB(g) isBond energy data are given as followsA – A = x kJ mol–1B – B = y kJ mol–1A – B = z kJ mol–1 x + y + zx – y – 2zx + y – 2zx + y – z
Answer» Q. The enthalpy change during the reaction A2(g) + B2(g) → 2AB(g) is Bond energy data are given as follows A – A = x kJ mol–1 B – B = y kJ mol–1 A – B = z kJ mol–1 x + y + z x – y – 2z x + y – 2z x + y – z

Discussion

31.	Which of the following has longest C=C bond length? 1) CH2=C=CH2 2) CH3-CH=CH2 3) (CH3)3C-CH=CH2 4) (CH3)2C=CH
Answer» Which of the following has longest C=C bond length? 1) CH2=C=CH2 2) CH3-CH=CH2 3) (CH3)3C-CH=CH2 4) (CH3)2C=CH

Discussion

32.	the atom with lowest atomic no. that has a ground state electronic configuration of(n-1)d6 ns2 is
Answer» the atom with lowest atomic no. that has a ground state electronic configuration of(n-1)d6 ns2 is

Discussion

33.	What is the relation of hydrolysis and ionic and covalent bonds in p block compounds?Explain in detail
Answer» What is the relation of hydrolysis and ionic and covalent bonds in p block compounds? Explain in detail

Discussion

34.	Why d/v1+d/v2 is equals to (v1+v2)d/v1v2
Answer» Why d/v1+d/v2 is equals to (v1+v2)d/v1v2

Discussion

35.	Which of the following salt has the same value of van't Hoff factor i as that of K4[Fe(CN)6]
Answer» Which of the following salt has the same value of van't Hoff factor i as that of $K_{4} [F e (C N)_{6}]$

Discussion

36.	what is change in internal energy, entropy, enthalpy, gibbs free energy for an ideal solution?
Answer» what is change in internal energy, entropy, enthalpy, gibbs free energy for an ideal solution?

Discussion

37.	A weak base BOH is titrated with a strong acid HA.When 10 mL of HA is added, pH is found to be9.00 and when 25 mL is added, pH is 8.00. Thevolume of the acid required to reach the equivalencepoint is(a) 55 mL (b) 40 mL (c) 30 mL (d) 50 mL
Answer» A weak base BOH is titrated with a strong acid HA.When 10 mL of HA is added, pH is found to be9.00 and when 25 mL is added, pH is 8.00. Thevolume of the acid required to reach the equivalencepoint is(a) 55 mL (b) 40 mL (c) 30 mL (d) 50 mL

Discussion

38.	(11.) The correct order of first ionization potential among following elements, Be, B, C is(2) B Be C(1) B< Be < C(4) Be < B< C(3) Be < C < B
Answer» (11.) The correct order of first ionization potential among following elements, Be, B, C is(2) B Be C(1) B< Be < C(4) Be < B< C(3) Be < C < B

Discussion

39.	Why does the valency of element in period three keeps on increasing while forming oxide?
Answer» Why does the valency of element in period three keeps on increasing while forming oxide?

Discussion

40.	Which is the main product of the given reaction?
Answer» Which is the main product of the given reaction?

Discussion

41.	Which of the following represent(s) correct major product(s)?
Answer» Which of the following represent(s) correct major product(s)?

Discussion

42.	H2+Cl2 gives 2HCl Here addition of Hydrogen and addition electronegative atom(Cl) takes place. Is this a redox reaction.
Answer» H2+Cl2 gives 2HCl Here addition of Hydrogen and addition electronegative atom(Cl) takes place. Is this a redox reaction.

Discussion

43.	Is there any significance of +5 oxidation state of Nitrogen in its compound?
Answer» Is there any significance of +5 oxidation state of Nitrogen in its compound?

Discussion

44.	What is Basal Surface and Free Surface
Answer» What is Basal Surface and Free Surface

Discussion

45.	The normal boiling point of water is 373 K. Vapour pressure of water at temperature T is 19 mm Hg. If enthalpy of vaporisation is 40671.40 J/mol, then temperature T would be:(Use :log2=0.3, R:8.3 JK−1 mo1−1)
Answer» The normal boiling point of water is $373 K$ . Vapour pressure of water at temperature $T$ is $19 mm Hg$ . If enthalpy of vaporisation is $40671.40 J/mol$ , then temperature $T$ would be: (Use : $log 2 = 0.3, R : 8.3 {JK}^{- 1} {mo1}^{- 1}$ )

Discussion

46.	The following reaction gives
Answer» The following reaction gives

46.

The following reaction gives

Answer»

The following reaction gives

Discussion

47.	23. MgO crystallised as rock salt .The number of nearest oxide ions to Mg+2 ion is
Answer» 23. MgO crystallised as rock salt .The number of nearest oxide ions to Mg+2 ion is

Discussion

48.	A compound has an empirical formula C2H4O. An independent analysis gave a value of 66.08 for its vapour density. What is the correct molecular formula?
Answer» A compound has an empirical formula $C_{2} H_{4} O$ . An independent analysis gave a value of $66.08$ for its vapour density. What is the correct molecular formula?

Discussion

49.	13.If 0.2 mole of chromite ore is used initially and rest of the reactants are in excess, then mole of chromium found will be?
Answer» 13.If 0.2 mole of chromite ore is used initially and rest of the reactants are in excess, then mole of chromium found will be?

Discussion

50.	Bond order of S-{O^{-2}}_{4 .} With reason and explanation
Answer» Bond order of S-{O^{-2}}_{4 .} With reason and explanation

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Given the bond energies N ≡ N, H − H and N − H bonds are 945,436 and 391 kJ mole−1 respectively, the enthalpy of the following reaction N2(g) + 3H2(g) → 2NH3(g) is

Proteins are hydrolysed by enzymes into

What should be the considerations during the extraction of metals by electrochemical method?

Of the four oxyacids of chlorine the strongest oxidising agent in dilute aqueous solution is

Which is best description of the behaviour of bromine in the reaction given below? H2O+Br2→HOBr+HBr

The formation of micelles takes places above a particular temperature, called as:

If the wavelength of the first line of Balmer series of hydrogen is 6561 ˚A, the wavelength of the second line of the same series will be,

What are the applications of Kohlrausch law?

2. For a first order reaction calculate the ratio between the time taken to complete three fourth of the reaction and the time taken to complete half of the reaction.

4.What are α rays and β rays?

How many geometrical isomers are possible in the followingcoordination entities?(i) [Cr(C2O4)3]3−(ii) [Co(NH3)3Cl3]

If the degree of dissociation of water at 70oC is 1.28×10−8. Then what is the ionic product of water at this temperature?

How can youdifferentiate between addition and condensation polymerisation?

Total volume of atoms present in a face centred cubic unit cell of a metal is (r = radius of atom).

25. a. if given compound is treated with NaBH4 then what product will be formed? b. if given compound is treated with LiAlH4 then what product will be formed?

The hydrolysis of an ester was carried out separately with 0.05M HCl and 0.05 M H2SO4. Which of the following will be true (A) K(HCI) > K(H2SO4) (B) K(HCI) < K(H2SO4) (C) K(HCI) = K(H2SO4)(D) K(HCI) = 2 K(H2SO4) here K is rate constant

The major product of the following addition reaction is:H3C−CH=CHBr2+H2O−−−−−−→

Conjugate base of HCO−3 is:

Urea reacts with water to form A which will decompose to form B. B when passed through Co3+ (aq), yellow coloured solution C is formed. What is the formula of C from the following?

Saccharic acid is obtained by oxidation of glucose. The sum of number of C, H and O present in saccharic acid is/are :

The solubilities of AgCl in water, 0.01 M CaCl2, 0.01 M NaCl and 0.05 M AgNO3 are denoted by S1, S2, S3, S4 respectively. Which of the following relationships are correct? Ksp=1.8×10−10

The compound most likely to decolourize a solution of potassium permanganate is

63.At what temperature R.M.S. velocity of oxygen will be half as that of methane at 27^° C Options: 54^° C 300 K 600 K 327 K

Sort out following halogens in decreasing order of their leaving capacity in SN2 reaction

Temperature of source is 330∘C. Temperature of sink is changed in order to increase the efficiency of engine from 15 to 14, by

Carbon-60 contains

If the enthalpies of formation of C3H8, CO2, H2O at standard conditions are -104kJ/mol, -394kJ/mol, -286kJ/mol respectively then the standard enthalpy of combustion of 66g of C3H8 will be(1) -2222 kJ(2) -2500 kJ(3) -784 kJ(4) -3333 kJ

The reactivity of different nucleophiles (NH−2,CH3COO−,OH−) is in the order:

Q. The enthalpy change during the reactionA2(g) + B2(g) → 2AB(g) isBond energy data are given as followsA – A = x kJ mol–1B – B = y kJ mol–1A – B = z kJ mol–1 x + y + zx – y – 2zx + y – 2zx + y – z

Which of the following has longest C=C bond length? 1) CH2=C=CH2 2) CH3-CH=CH2 3) (CH3)3C-CH=CH2 4) (CH3)2C=CH

the atom with lowest atomic no. that has a ground state electronic configuration of(n-1)d6 ns2 is

What is the relation of hydrolysis and ionic and covalent bonds in p block compounds?Explain in detail

Why d/v1+d/v2 is equals to (v1+v2)d/v1v2

Which of the following salt has the same value of van't Hoff factor i as that of K4[Fe(CN)6]

what is change in internal energy, entropy, enthalpy, gibbs free energy for an ideal solution?

A weak base BOH is titrated with a strong acid HA.When 10 mL of HA is added, pH is found to be9.00 and when 25 mL is added, pH is 8.00. Thevolume of the acid required to reach the equivalencepoint is(a) 55 mL (b) 40 mL (c) 30 mL (d) 50 mL

(11.) The correct order of first ionization potential among following elements, Be, B, C is(2) B Be C(1) B< Be < C(4) Be < B< C(3) Be < C < B

Why does the valency of element in period three keeps on increasing while forming oxide?

Which is the main product of the given reaction?

Which of the following represent(s) correct major product(s)?

H2+Cl2 gives 2HCl Here addition of Hydrogen and addition electronegative atom(Cl) takes place. Is this a redox reaction.

Is there any significance of +5 oxidation state of Nitrogen in its compound?

What is Basal Surface and Free Surface

The normal boiling point of water is 373 K. Vapour pressure of water at temperature T is 19 mm Hg. If enthalpy of vaporisation is 40671.40 J/mol, then temperature T would be:(Use :log2=0.3, R:8.3 JK−1 mo1−1)

The following reaction gives

23. MgO crystallised as rock salt .The number of nearest oxide ions to Mg+2 ion is

A compound has an empirical formula C2H4O. An independent analysis gave a value of 66.08 for its vapour density. What is the correct molecular formula?

13.If 0.2 mole of chromite ore is used initially and rest of the reactants are in excess, then mole of chromium found will be?

Bond order of S-{O^{-2}}_{4 .} With reason and explanation