46295 + Interview Questions in Chemistry

1.	At temperature T, the compound AB2(g) dissociates according to the reaction, 2AB2(g)⇌2AB(g)+B2(g) with a degree of dissociation, x. which is small compared with unity. Deduce the expression for x in terms of the equilibrium constant, Kp and the total pressure, P.
Answer» At temperature $T$ , the compound $A B_{2} (g)$ dissociates according to the reaction, $2 A B_{2} (g) ⇌ 2 A B (g) + B_{2} (g)$ with a degree of dissociation, $x$ . which is small compared with unity. Deduce the expression for $x$ in terms of the equilibrium constant, $K_{p}$ and the total pressure, $P$ .

Discussion

2.	If the third term in the expansion of [x+xlog10x]5 is 106 then x must be
Answer» If the third term in the expansion of $[x + x^{l o g} 10^{x}]^{5} i s 10^{6}$ then x must be

Discussion

3.	The order of reactivity of the following alkyl halides for an SN2 reaction is
Answer» The order of reactivity of the following alkyl halides for an SN² reaction is

Discussion

4.	Octet rule is not valid for which of the following molecules?
Answer» Octet rule is not valid for which of the following molecules?

Discussion

5.	The decreasing order of basic strengths of the following compounds is:
Answer» The decreasing order of basic strengths of the following compounds is:

Discussion

6.	(a) (i) Write the disproportionation reaction of H3PO3 . (ii) Draw the structure of XeF4 . (b) Account for the following : (i) Although Fluorine has less negative electron gain enthalpy yet F2 is strong oxidizing agent. (ii) Acidic character decreases from N2O3 to Bi2O3 in group 15.
Answer» (a) (i) Write the disproportionation reaction of $H_{3} P O_{3}$ . (ii) Draw the structure of $X e F_{4}$ . (b) Account for the following : (i) Although Fluorine has less negative electron gain enthalpy yet $F_{2}$ is strong oxidizing agent. (ii) Acidic character decreases from $N_{2} O_{3}$ to $B i_{2} O_{3}$ in group 15.

Discussion

7.	The volume of the HCP unit cell is
Answer» The volume of the HCP unit cell is

Discussion

8.	Osmotic pressure is 0.0821 atm at a temperature of 300 K. Find concentration in mole/litre.
Answer» Osmotic pressure is 0.0821 atm at a temperature of 300 K. Find concentration in mole/litre.

Discussion

9.	What is meant by antibiotics and analgesics ?
Answer» What is meant by antibiotics and analgesics ?

Discussion

10.	Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour? (Atomic number Cr = 24, Mn = 25, Fe = 26, Ni = 28)
Answer» Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour? (Atomic number Cr = 24, Mn = 25, Fe = 26, Ni = 28)

Discussion

11.	A tertiary alcohol ‘H’ upon acid catalyzed dehydration gives a product I. Ozonolysis of I leads to compounds J and K. Compound J upon reaction with KOH gives benzyl alcohol and a compound L, whereas K on reaction with KOH gives only M. The structure of compound I is:
Answer» A tertiary alcohol ‘H’ upon acid catalyzed dehydration gives a product I. Ozonolysis of I leads to compounds J and K. Compound J upon reaction with KOH gives benzyl alcohol and a compound L, whereas K on reaction with KOH gives only M. The structure of compound I is:

11.

A tertiary alcohol ‘H’ upon acid catalyzed dehydration gives a product I. Ozonolysis of I leads to compounds J and K. Compound J upon reaction with KOH gives benzyl alcohol and a compound L, whereas K on reaction with KOH gives only M. The structure of compound I is:

Answer»

A tertiary alcohol ‘H’ upon acid catalyzed dehydration gives a product I. Ozonolysis of I leads to compounds J and K. Compound J upon reaction with KOH gives benzyl alcohol and a compound L, whereas K on reaction with KOH gives only M.

The structure of compound I is:

Discussion

12.	The choice of a reducing agent in a particular case depends on thermodynamic factor. How far do you agree with this statement ? Support your opiniion with two examples.
Answer» The choice of a reducing agent in a particular case depends on thermodynamic factor. How far do you agree with this statement ? Support your opiniion with two examples.

Discussion

13.	Which of the following molecule does not produce HCl as one of the hydrolysed product?
Answer» Which of the following molecule does not produce $H C l$ as one of the hydrolysed product?

Discussion

14.	Identify the correct order of flocculation value for Fe(OH)3 sol:
Answer» Identify the correct order of flocculation value for $F e (O H)_{3}$ sol:

Discussion

15.	The maximum number of compounds with the molecular formula C4H11N, which give an alkali soluble compound when reacted with benzenesulfonyl chloride is:
Answer» The maximum number of compounds with the molecular formula $C_{4} H_{11} N$ , which give an alkali soluble compound when reacted with benzenesulfonyl chloride is:

Discussion

16.	Which of the following compounds have same geometry ammong the following : (i) H2O (ii) AlCl3 (iii) CH4 (iv) NF3
Answer» Which of the following compounds have same geometry ammong the following : (i) $H_{2} O$ (ii) $A l C l_{3}$ (iii) $C H_{4}$ (iv) $N F_{3}$

Discussion

17.	The ionic radii of isoelectronic species N3−, O2− and F− in oA are respectively:
Answer» The ionic radii of isoelectronic species $N^{3 -}, O^{2 -}$ and $F^{-}$ in $o A$ are respectively:

Discussion

18.	The X -X bond length is 1 ∘A and Y - Y bond length is 1.54 ∘A. If electronegativities of 'X' and 'Y' are 3.0 and 2.0 respectively, the X - Y bond length is likely to be
Answer» The X -X bond length is 1 $\circ A$ and Y - Y bond length is $1.54 \circ A$ . If electronegativities of 'X' and 'Y' are 3.0 and 2.0 respectively, the X - Y bond length is likely to be

Discussion

19.	Galena (an ore) is parrtially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of O2 consumed is
Answer» Galena (an ore) is parrtially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of $O_{2}$ consumed is

Discussion

20.	The correct increasing order of wavelengths of absorption in the visible region for the complexes of Co3+ is:
Answer» The correct increasing order of wavelengths of absorption in the visible region for the complexes of $C o^{3 +}$ is:

Discussion

21.	What is the increasing order of equivalent weights of the following oxidising agents? (i) KMnO4⟶Mn2+ (ii) K2Cr2O7⟶Cr3+ (iii) KClO3⟶Cl− [Atomic wt.: K=39,Cr=52,Mn=55,Cl=35.5,O=16]
Answer» What is the increasing order of equivalent weights of the following oxidising agents? (i) $K M n O_{4} ⟶ M n^{2 +}$ (ii) $K_{2} C r_{2} O_{7} ⟶ C r^{3 +}$ (iii) $K C l O_{3} ⟶ C l^{-}$ [Atomic wt.: $K = 39, C r = 52, M n = 55, C l = 35.5, O = 16$ ]

Discussion

22.	What is the hybridization of N in solid N2O5?
Answer» What is the hybridization of $N$ in solid $N_{2} O_{5}$ ?

Discussion

23.	Show that the data given below is in agreement with law of constant composition No. Mass of iron mass of iron oxide 1 2.7812 g 3.9756 g 2 3.0499 g 4.3596 g 3 4.4913 g 6.4202g
Answer» Show that the data given below is in agreement with law of constant composition No. Mass of iron mass of iron oxide 1 2.7812 g 3.9756 g 2 3.0499 g 4.3596 g 3 4.4913 g 6.4202g

23.

Show that the data given below is in agreement with law of constant composition No. Mass of iron mass of iron oxide 1 2.7812 g 3.9756 g 2 3.0499 g 4.3596 g 3 4.4913 g 6.4202g

Answer»

Show that the data given below is in agreement with law of constant composition

No. Mass of iron mass of iron oxide

1 2.7812 g 3.9756 g

2 3.0499 g 4.3596 g

3 4.4913 g 6.4202g

Discussion

24.	Phenol is not obtained by:
Answer» Phenol is not obtained by:

Discussion

25.	In which case number of C atoms is retained
Answer» In which case number of C atoms is retained

Discussion

26.	What is the probability of reaction with molecularity higher than three very rare?
Answer» What is the probability of reaction with molecularity higher than three very rare?

Discussion

27.	What hybridization is expected on the central atom of each of the following molecules? (i) BeH2 (ii) CH2Br2 (iii) PF−6 (iv) BF3
Answer» What hybridization is expected on the central atom of each of the following molecules? (i) $B e H_{2}$ (ii) $C H_{2} B r_{2}$ (iii) $P F_{6}^{-}$ (iv) $B F_{3}$

Discussion

28.	Which of the following pairs have the same number of atoms ? (a) 16 g of O2(g) and 4 g of H2(g) (b) 16 g of O2 and 44 g of CO2 (c) 28 g of N2 and 32 g of O2 (d) 12 g of C(x) and 23 g of Na(s)
Answer» Which of the following pairs have the same number of atoms ? (a) 16 g of $O_{2} (g)$ and 4 g of $H_{2} (g)$ (b) 16 g of $O_{2}$ and 44 g of $C O_{2}$ (c) 28 g of $N_{2}$ and 32 g of $O_{2}$ (d) 12 g of C(x) and 23 g of Na(s)

28.

Which of the following pairs have the same number of atoms ? (a) 16 g of O2(g) and 4 g of H2(g) (b) 16 g of O2 and 44 g of CO2 (c) 28 g of N2 and 32 g of O2 (d) 12 g of C(x) and 23 g of Na(s)

Answer»

Which of the following pairs have the same number of atoms ?

(a) 16 g of $O_{2} (g)$ and 4 g of $H_{2} (g)$

(b) 16 g of $O_{2}$ and 44 g of $C O_{2}$

(c) 28 g of $N_{2}$ and 32 g of $O_{2}$

(d) 12 g of C(x) and 23 g of Na(s)

Discussion

29.	For a given reaction: C(s)+O2(g)→Co(g)+H2(g) at 25oC ΔH=131kJ/mol Given: Kp = 9.36×10−17 Calculate the value of reaction constant at 700oC.
Answer» For a given reaction: $C (s) + O_{2} (g) \to C o (g) + H_{2} (g)$ at $25^{o} C$ $Δ H = 131 k J / m o l$ Given: $K_{p}$ = $9.36 \times 10^{- 17}$ Calculate the value of reaction constant at $700^{o} C$ .

Discussion

30.	The nitrogen oxides that contain N – N bond(s) is:
Answer» The nitrogen oxides that contain N – N bond(s) is:

Discussion

31.	What is the charge on the complex [Cr(C2O4)2(H2O)2] formed by Cr(III)?
Answer» What is the charge on the complex $[C r (C_{2} O_{4})_{2} (H_{2} O)_{2}]$ formed by $C r (I I I)$ ?

Discussion

32.	PhOHMe2SO4−−−−−→NaOHP 'P' is:
Answer» $P h O H M e_{2} S O_{4} - ---- \to N a O H P$ 'P' is:

Discussion

33.	On hydrolysis a maltose molecule gives
Answer» On hydrolysis a maltose molecule gives

Discussion

34.	Why do solids liquids and gases differ in their physical state
Answer» Why do solids liquids and gases differ in their physical state

Discussion

35.	Semipermeable membrane is that which permits the passage of:
Answer» Semipermeable membrane is that which permits the passage of:

Discussion

36.	What is the number of moles of Oxygen atom in 126 amu of HNO3
Answer» What is the number of moles of Oxygen atom in 126 amu of $H N O_{3}$

Discussion

37.	If one litre of air is placed repeatedly over heated copper and magnesium till no further reduction in volume takes ok lace. Then the volume obtained finally would be approximately
Answer» If one litre of air is placed repeatedly over heated copper and magnesium till no further reduction in volume takes ok lace. Then the volume obtained finally would be approximately

Discussion

38.	Does a C2 bond exist? And is it stable, if yes what is its VSEPR structure?
Answer» Does a C2 bond exist? And is it stable, if yes what is its VSEPR structure?

Discussion

39.	Assign reason for the following: (i) H3PO2 is a stronger reducing agent than H3PO4. (ii) Sulphur shows more tendency for catenation than Oxygen. (iii) Reducing character increases from HF to HI.
Answer» Assign reason for the following: (i) $H_{3} P O_{2}$ is a stronger reducing agent than $H_{3} P O_{4}$ . (ii) Sulphur shows more tendency for catenation than Oxygen. (iii) Reducing character increases from $H F$ to $H I$ .

Discussion

40.	List of metals that can be extracted electrolytically.
Answer» List of metals that can be extracted electrolytically.

Discussion

41.	The energy required to dislodge electron from excited isolated hydrogen atom(IE1=13.6eV). A)=13.6ev B)>13.6 C) 3.4 D)less than or equal to 3.4eV The answer is D but how if i assume that the electron is at the second energy state(n=2) its energy would be -3.4eV so we should give either 3.4ev or more than that
Answer» The energy required to dislodge electron from excited isolated hydrogen atom(IE1=13.6eV). A)=13.6ev B)>13.6 C) <13.6 and >3.4 D)less than or equal to 3.4eV The answer is D but how if i assume that the electron is at the second energy state(n=2) its energy would be -3.4eV so we should give either 3.4ev or more than that

Discussion

42.	Germanium or silicon becomes extrinsic semi-conductor due to
Answer» Germanium or silicon becomes extrinsic semi-conductor due to

Discussion

43.	Question 17 Identify the pairs which are not of isotopes ? (a) 126X,126Y (b) 3517X,3717Y (c) 146X,147Y (d) 84X,85Y
Answer» Question 17 Identify the pairs which are not of isotopes ? (a) $_{6}^{12} X,_{6}^{12} Y$ (b) $_{17}^{35} X,_{17}^{37} Y$ (c) $_{6}^{14} X,_{7}^{14} Y$ (d) $_{4}^{8} X,_{5}^{8} Y$

43.

Question 17 Identify the pairs which are not of isotopes ? (a) 126X,126Y (b) 3517X,3717Y (c) 146X,147Y (d) 84X,85Y

Answer»

Question 17

Identify the pairs which are not of isotopes ?

(a) $_{6}^{12} X,_{6}^{12} Y$ (b) $_{17}^{35} X,_{17}^{37} Y$ (c) $_{6}^{14} X,_{7}^{14} Y$ (d) $_{4}^{8} X,_{5}^{8} Y$

Discussion

44.	Which moieties of nucleosides are involved in the formation of phosphodiester linkages present in dinucleotides? What does the word diester in the name of linkage indicate? Which acid is involved in the formation of this linkage?
Answer» Which moieties of nucleosides are involved in the formation of phosphodiester linkages present in dinucleotides? What does the word diester in the name of linkage indicate? Which acid is involved in the formation of this linkage?

Discussion

45.	The lyophobic colloid present in the milk is:
Answer» The lyophobic colloid present in the milk is:

Discussion

46.	Which type of hybridization leads to three dimensional geometry of bonds around the carbon atom?
Answer» Which type of hybridization leads to three dimensional geometry of bonds around the carbon atom?

Discussion

47.	Increasing order of the reactivity of the following compounds towards the nitration will be
Answer» Increasing order of the reactivity of the following compounds towards the nitration will be

47.

Increasing order of the reactivity of the following compounds towards the nitration will be

Answer»

Increasing order of the reactivity of the following compounds towards the nitration will be

Discussion

48.	Addition of a non-volatile solute to a solvent always increases the colligative property such as π,ΔPP∘,ΔTb and ΔTf. All these colligative properties are directly proportional to the molality. The increase in colligative properties is due to increase in number of solute particles. For different aqueous solutions of 0.1 N urea, 0.1 N NaCl, 0.1 N Na2SO4 and 0.1 N Na3PO4 solutions at 27∘C, the correct statements are: (I) The order of osmotic pressure is NaCl>Na2SO4>Na3PO4>Urea (II) π=ΔTbKbRT for urea solution (III) Addition of salt on ice increases its melting point (IV) Addition of salt brings melting of ice earlier
Answer» Addition of a non-volatile solute to a solvent always increases the colligative property such as $π, \frac{Δ P}{P^{\circ}}, Δ T_{b}$ and $Δ T_{f}$ . All these colligative properties are directly proportional to the molality. The increase in colligative properties is due to increase in number of solute particles. For different aqueous solutions of 0.1 N urea, 0.1 N NaCl, 0.1 N $N a_{2} S O_{4}$ and 0.1 N $N a_{3} P O_{4}$ solutions at $27^{\circ} C$ , the correct statements are: (I) The order of osmotic pressure is $N a C l > N a_{2} S O_{4} > N a_{3} P O_{4} > U r e a$ (II) $π = \frac{Δ T_{b}}{K_{b}} R T$ for urea solution (III) Addition of salt on ice increases its melting point (IV) Addition of salt brings melting of ice earlier

Discussion

49.	QUESTION 2.4 Concentrated nitric acid used in laboratory work is 68%68\%68% nitric acid by aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g mL−1mL^{-1}mL−1 ?
Answer» QUESTION 2.4 Concentrated nitric acid used in laboratory work is $68%68\%$ nitric acid by aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g $mL^{-1}$ ?

49.

QUESTION 2.4 Concentrated nitric acid used in laboratory work is 68%68\%68% nitric acid by aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g mL−1mL^{-1}mL−1 ?

Answer»

QUESTION 2.4

Concentrated nitric acid used in laboratory work is $68%68\%$ nitric acid by aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g $mL^{-1}$ ?

Discussion

50.	If R=Me2CH− (isopropyl), the correct order of basic character of the given amines in aqueous medium is:
Answer» If $R = M e_{2} C H -$ (isopropyl), the correct order of basic character of the given amines in aqueous medium is:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

At temperature T, the compound AB2(g) dissociates according to the reaction, 2AB2(g)⇌2AB(g)+B2(g) with a degree of dissociation, x. which is small compared with unity. Deduce the expression for x in terms of the equilibrium constant, Kp and the total pressure, P.

If the third term in the expansion of [x+xlog10x]5 is 106 then x must be

The order of reactivity of the following alkyl halides for an SN2 reaction is

Octet rule is not valid for which of the following molecules?

The decreasing order of basic strengths of the following compounds is:

(a) (i) Write the disproportionation reaction of H3PO3 . (ii) Draw the structure of XeF4 . (b) Account for the following : (i) Although Fluorine has less negative electron gain enthalpy yet F2 is strong oxidizing agent. (ii) Acidic character decreases from N2O3 to Bi2O3 in group 15.

The volume of the HCP unit cell is

Osmotic pressure is 0.0821 atm at a temperature of 300 K. Find concentration in mole/litre.

What is meant by antibiotics and analgesics ?

Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour? (Atomic number Cr = 24, Mn = 25, Fe = 26, Ni = 28)

A tertiary alcohol ‘H’ upon acid catalyzed dehydration gives a product I. Ozonolysis of I leads to compounds J and K. Compound J upon reaction with KOH gives benzyl alcohol and a compound L, whereas K on reaction with KOH gives only M. The structure of compound I is:

The choice of a reducing agent in a particular case depends on thermodynamic factor. How far do you agree with this statement ? Support your opiniion with two examples.

Which of the following molecule does not produce HCl as one of the hydrolysed product?

Identify the correct order of flocculation value for Fe(OH)3 sol:

The maximum number of compounds with the molecular formula C4H11N, which give an alkali soluble compound when reacted with benzenesulfonyl chloride is:

Which of the following compounds have same geometry ammong the following : (i) H2O (ii) AlCl3 (iii) CH4 (iv) NF3

The ionic radii of isoelectronic species N3−, O2− and F− in oA are respectively:

The X -X bond length is 1 ∘A and Y - Y bond length is 1.54 ∘A. If electronegativities of 'X' and 'Y' are 3.0 and 2.0 respectively, the X - Y bond length is likely to be

Galena (an ore) is parrtially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of O2 consumed is

The correct increasing order of wavelengths of absorption in the visible region for the complexes of Co3+ is:

What is the increasing order of equivalent weights of the following oxidising agents? (i) KMnO4⟶Mn2+ (ii) K2Cr2O7⟶Cr3+ (iii) KClO3⟶Cl− [Atomic wt.: K=39,Cr=52,Mn=55,Cl=35.5,O=16]

What is the hybridization of N in solid N2O5?

Show that the data given below is in agreement with law of constant composition No. Mass of iron mass of iron oxide 1 2.7812 g 3.9756 g 2 3.0499 g 4.3596 g 3 4.4913 g 6.4202g

Phenol is not obtained by:

In which case number of C atoms is retained

What is the probability of reaction with molecularity higher than three very rare?

What hybridization is expected on the central atom of each of the following molecules? (i) BeH2 (ii) CH2Br2 (iii) PF−6 (iv) BF3

Which of the following pairs have the same number of atoms ? (a) 16 g of O2(g) and 4 g of H2(g) (b) 16 g of O2 and 44 g of CO2 (c) 28 g of N2 and 32 g of O2 (d) 12 g of C(x) and 23 g of Na(s)

For a given reaction: C(s)+O2(g)→Co(g)+H2(g) at 25oC ΔH=131kJ/mol Given: Kp = 9.36×10−17 Calculate the value of reaction constant at 700oC.

The nitrogen oxides that contain N – N bond(s) is:

What is the charge on the complex [Cr(C2O4)2(H2O)2] formed by Cr(III)?

PhOHMe2SO4−−−−−→NaOHP 'P' is:

On hydrolysis a maltose molecule gives

Why do solids liquids and gases differ in their physical state

Semipermeable membrane is that which permits the passage of:

What is the number of moles of Oxygen atom in 126 amu of HNO3

If one litre of air is placed repeatedly over heated copper and magnesium till no further reduction in volume takes ok lace. Then the volume obtained finally would be approximately

Does a C2 bond exist? And is it stable, if yes what is its VSEPR structure?

Assign reason for the following: (i) H3PO2 is a stronger reducing agent than H3PO4. (ii) Sulphur shows more tendency for catenation than Oxygen. (iii) Reducing character increases from HF to HI.

List of metals that can be extracted electrolytically.

Germanium or silicon becomes extrinsic semi-conductor due to

Question 17 Identify the pairs which are not of isotopes ? (a) 126X,126Y (b) 3517X,3717Y (c) 146X,147Y (d) 84X,85Y

Which moieties of nucleosides are involved in the formation of phosphodiester linkages present in dinucleotides? What does the word diester in the name of linkage indicate? Which acid is involved in the formation of this linkage?

The lyophobic colloid present in the milk is:

Which type of hybridization leads to three dimensional geometry of bonds around the carbon atom?

Increasing order of the reactivity of the following compounds towards the nitration will be

QUESTION 2.4 Concentrated nitric acid used in laboratory work is 68%68\%68% nitric acid by aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g mL−1mL^{-1}mL−1 ?

If R=Me2CH− (isopropyl), the correct order of basic character of the given amines in aqueous medium is: