46295 + Interview Questions in Chemistry

1.	For a phase change H2O(l)0 ∘C,1 bar⇌H2O(s)
Answer» For a phase change $H_{2} O (l) 0^{\circ} C, 1 b a r ⇌ H_{2} O (s)$

Discussion

2.	Heavy water (D2O) is
Answer» Heavy water ( $D_{2} O$ ) is

2.

Heavy water (D2O) is

Answer»

Heavy water ( $D_{2} O$ ) is

Discussion

3.	Aqueous solution of HCl has the pH = 4. Its molarity would be
Answer» Aqueous solution of $H C l$ has the pH = 4. Its molarity would be

3.

Aqueous solution of HCl has the pH = 4. Its molarity would be

Answer»

Aqueous solution of $H C l$ has the pH = 4. Its molarity would be

Discussion

4.	Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s2 2s2 2p3, the simplest formula for this compound is:
Answer» Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is $1 s^{2}$ $2 s^{2}$ $2 p^{3}$ , the simplest formula for this compound is:

Discussion

5.	Which of the following compounds will be suitable for Kjeldahl's method of nitrogen estimation?
Answer» Which of the following compounds will be suitable for Kjeldahl's method of nitrogen estimation?

Discussion

6.	Which of the following reactions will go faster if the concentration of the nucleophile is increased?
Answer» Which of the following reactions will go faster if the concentration of the nucleophile is increased?

Discussion

7.	The standard redox potentials E0 of the following system are I.MnO−4+8H++5e−→Mn2++4H2OE0=1.5 V II. Sn2+→Sn4++2e−E0=−0.15 V III. Cr2O2−7+14H++6e−→2Cr2++7H2O E0=1.33 V IV. Ce3+→Ce4++e− E0=−1.61V The oxidizing power of the various species are related as
Answer» The standard redox potentials $E^{0}$ of the following system are $I . M n O_{4}^{-} + 8 H^{+} + 5 e^{-} \to M n^{2 +} + 4 H_{2} O E^{0} = 1.5 V$ $I I . S n^{2 +} \to S n^{4 +} + 2 e^{-} E^{0} = - 0.15 V$ $I I I . C r_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} \to 2 C r^{2 +} + 7 H_{2} O E^{0} = 1.33 V$ $I V . C e^{3 +} \to C e^{4 +} + e^{-} E^{0} = - 1.61 V$ The oxidizing power of the various species are related as

Discussion

8.	Which of the following is not a redox reaction:
Answer» Which of the following is not a redox reaction:

Discussion

9.	Which of the following is a covalent crystal?
Answer» Which of the following is a covalent crystal?

Discussion

10.	In the following reaction, the major product is
Answer» In the following reaction, the major product is

Discussion

11.	Which of the following is the correct order of the first ionisation energy?
Answer» Which of the following is the correct order of the first ionisation energy?

Discussion

12.	The only correct combination for synthetic rubber
Answer» The only correct combination for synthetic rubber

Discussion

13.	In pressure-volume diagram given below, the isochoric, isothermal, and isobaric parts respectively, are
Answer» In pressure-volume diagram given below, the isochoric, isothermal, and isobaric parts respectively, are

Discussion

14.	Consider the following reactions: Path (I) NaNH2+N2O→A+NH3+NaOH A+H2SO4→B+Na2SO4 Path (II) NaNO2+H2SO4in situ−−−−→C+Na2SO4 C+N2H4→B+H2O The two paths are used to form compound B, which is used in the Schmidt reaction. If we start with 0.2 moles of N2O in Path (I) and 0.6 moles of NaNO2 in Path (II) to form compound B, then x millimoles of B are formed. The value of x is
Answer» Consider the following reactions: Path (I) $N a N H_{2} + N_{2} O \to A + N H_{3} + N a O H$ $A + H_{2} S O_{4} \to B + N a_{2} S O_{4}$ Path (II) $N a N O_{2} + H_{2} S O_{4} i n s i t u - --- \to C + N a_{2} S O_{4}$ $C + N_{2} H_{4} \to B + H_{2} O$ The two paths are used to form compound B, which is used in the Schmidt reaction. If we start with 0.2 moles of $N_{2} O$ in Path (I) and 0.6 moles of $N a N O_{2}$ in Path (II) to form compound B, then $x$ millimoles of B are formed. The value of $x$ is

Discussion

15.	In the given reaction CH3−CH2−COOH (i)AgNo3−−−−−−→(ii)Br2/△[x] X will be
Answer» In the given reaction $C H_{3} - C H_{2} - C O O H (i) A g N o_{3} - ----- \to (i i) B r_{2} / △ [x] X w i l l b e$

Discussion

16.	The ionic radius of Cr is minimum in which of the following compounds?Why? A)CrO2 B)CrCl2 C)K2CrO4 D)CrF3
Answer» The ionic radius of Cr is minimum in which of the following compounds?Why? A)CrO2 B)CrCl2 C)K2CrO4 D)CrF3

16.

The ionic radius of Cr is minimum in which of the following compounds?Why? A)CrO2 B)CrCl2 C)K2CrO4 D)CrF3

Answer»

The ionic radius of Cr is minimum in which of the following compounds?Why?

A)CrO2

B)CrCl2

C)K2CrO4

D)CrF3

Discussion

17.	Which one of the following is not artificial sweetening agent?
Answer» Which one of the following is not artificial sweetening agent?

Discussion

18.	Which statement is correct for inductive effect
Answer» Which statement is correct for inductive effect

Discussion

19.	For a body along the inclined plane, the normal reaction acts
Answer» For a body along the inclined plane, the normal reaction acts

Discussion

20.	Which of the following compounds wil exhibit geometrical isomerism?
Answer» Which of the following compounds wil exhibit geometrical isomerism?

Discussion

21.	What is propargyl halide?
Answer» What is propargyl halide?

Discussion

22.	The first ionization potential in electron volts of nitrogen and oxygen atoms respectively are given by
Answer» The first ionization potential in electron volts of nitrogen and oxygen atoms respectively are given by

Discussion

23.	Halides of alkaline earth metals form hydrates such as MgCl2.6H2O,CaCl2.6H2O, BaCl2.2H2O and SrCl2.2H2O. This shows that halides of group 2 elements
Answer» Halides of alkaline earth metals form hydrates such as MgCl₂.6H₂O,CaCl₂.6H₂O, BaCl₂.2H₂O and SrCl₂.2H₂O. This shows that halides of group 2 elements

Discussion

24.	1 mol each of AgNO3,CuSO4 and AlCl3 is electrolysed. Number of faradays required are in the ratio of :
Answer» 1 mol each of $A g N O_{3}, C u S O_{4}$ and $A l C l_{3}$ is electrolysed. Number of faradays required are in the ratio of :

Discussion

25.	The state in which 99% matter of the Universe exists is
Answer» The state in which $99 %$ matter of the Universe exists is

Discussion

26.	A weak acid HA after treating with 12 mL of 0.1 M strong base BOH has a pH of 5. At the end point the volume of same base required is 26.6 mL. Calculate the Ka of an acid.
Answer» A weak acid $H A$ after treating with $12 mL$ of $0.1 M$ strong base $B O H$ has a $p H$ of 5. At the end point the volume of same base required is $26.6 mL$ . Calculate the $K_{a}$ of an acid.

Discussion

27.	Addition of phosphate fertilizers into water leads to
Answer» Addition of phosphate fertilizers into water leads to

Discussion

28.	Medicines are either man made (i.e., synthetic) or obtained from living organisms like plants, bacteria, animals, etc, and hence, the letter are called natural products. Sometimes, natural products are chemically altered by man to reduce toxicity of side effects. Write against each of teh following whether they were initially obtained as a natural product or as synthetic chemical. (a) Penicillin (b) Sulphonamide (c) Vitamin-C (d) Growth hormone
Answer» Medicines are either man made (i.e., synthetic) or obtained from living organisms like plants, bacteria, animals, etc, and hence, the letter are called natural products. Sometimes, natural products are chemically altered by man to reduce toxicity of side effects. Write against each of teh following whether they were initially obtained as a natural product or as synthetic chemical. (a) Penicillin (b) Sulphonamide (c) Vitamin-C (d) Growth hormone

28.

Medicines are either man made (i.e., synthetic) or obtained from living organisms like plants, bacteria, animals, etc, and hence, the letter are called natural products. Sometimes, natural products are chemically altered by man to reduce toxicity of side effects. Write against each of teh following whether they were initially obtained as a natural product or as synthetic chemical. (a) Penicillin (b) Sulphonamide (c) Vitamin-C (d) Growth hormone

Answer»

Medicines are either man made (i.e., synthetic) or obtained from living organisms like plants, bacteria, animals, etc, and hence, the letter are called natural products. Sometimes, natural products are chemically altered by man to reduce toxicity of side effects. Write against each of teh following whether they were initially obtained as a natural product or as synthetic chemical.

(a) Penicillin (b) Sulphonamide (c) Vitamin-C (d) Growth hormone

Discussion

29.	QUESTION 2.39 The air is a mixture of a number of gases. The major components are oxygen and nitrogen with approximate proportion of 20% is to 79% by volume at 298 K. The water is in equilibrium with air at pressure of 10 atm. At 298 K if the Henry's law constants for oxygen and nitrogen at 298 K are 3.30×107 mm and 6.51×107 mm respectively, calculate the composition of these gases in water.
Answer» QUESTION 2.39 The air is a mixture of a number of gases. The major components are oxygen and nitrogen with approximate proportion of $20 %$ is to $79 %$ by volume at 298 K. The water is in equilibrium with air at pressure of 10 atm. At 298 K if the Henry's law constants for oxygen and nitrogen at 298 K are $3.30 \times 10^{7} m m$ and $6.51 \times 10^{7} m m$ respectively, calculate the composition of these gases in water.

29.

QUESTION 2.39 The air is a mixture of a number of gases. The major components are oxygen and nitrogen with approximate proportion of 20% is to 79% by volume at 298 K. The water is in equilibrium with air at pressure of 10 atm. At 298 K if the Henry's law constants for oxygen and nitrogen at 298 K are 3.30×107 mm and 6.51×107 mm respectively, calculate the composition of these gases in water.

Answer»

QUESTION 2.39

The air is a mixture of a number of gases. The major components are oxygen and nitrogen with approximate proportion of $20 %$ is to $79 %$ by volume at 298 K. The water is in equilibrium with air at pressure of 10 atm. At 298 K if the Henry's law constants for oxygen and nitrogen at 298 K are $3.30 \times 10^{7} m m$ and $6.51 \times 10^{7} m m$ respectively, calculate the composition of these gases in water.

Discussion

30.	Ecological sanitation is a sustainable system for handling human excreta using dry composting toilets. Such “ecosave” toilets are working in many areas of:
Answer» Ecological sanitation is a sustainable system for handling human excreta using dry composting toilets. Such “ecosave” toilets are working in many areas of:

Discussion

31.	How do you count for the following observations? Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redox equation for the reaction. When concentrated sulphuric acid is added to an inorganic mixture containing chloride, we get colourless pungent smelling gas HCl, but if the mixture contains bromide then we get red vapour of bromine. Why?
Answer» How do you count for the following observations? Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redox equation for the reaction. When concentrated sulphuric acid is added to an inorganic mixture containing chloride, we get colourless pungent smelling gas HCl, but if the mixture contains bromide then we get red vapour of bromine. Why?

31.

How do you count for the following observations? Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redox equation for the reaction. When concentrated sulphuric acid is added to an inorganic mixture containing chloride, we get colourless pungent smelling gas HCl, but if the mixture contains bromide then we get red vapour of bromine. Why?

Answer»

How do you count for the following observations?
Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redox equation for the reaction.

When concentrated sulphuric acid is added to an inorganic mixture containing chloride, we get colourless pungent smelling gas HCl, but if the mixture contains bromide then we get red vapour of bromine. Why?

Discussion

32.	Do you expect the carbon hydrides of the type (CnH2n+2) to act as 'Lewis' acid or base? Justify your answer.
Answer» Do you expect the carbon hydrides of the type $(C_{n} H_{2 n + 2})$ to act as 'Lewis' acid or base? Justify your answer.

Discussion

33.	Arrange the following according to their increasing order of boiling points.
Answer» Arrange the following according to their increasing order of boiling points.

Discussion

34.	A sample of hyhdrazine sulphate (N2H6SO4) was dissolved in 100 ml water. 10 ml of this solution was reacted with excess of solution and warmed to complete the reaction. Ferrous ions formed required 20 ml of solution. Given : 4Fe3++N2H4→N2+Fe2++4H+ MnO−4+5Fe2++8H+→Mn2++5Fe3++4H2O The amount (g) of hydrazine sulphate in one litre is
Answer» A sample of hyhdrazine sulphate $(N_{2} H_{6} S O_{4})$ was dissolved in 100 ml water. 10 ml of this solution was reacted with excess of solution and warmed to complete the reaction. Ferrous ions formed required 20 ml of solution. Given : $4 F e^{3 +} + N_{2} H_{4} \to N_{2} + F e^{2 +} + 4 H^{+}$ $M n O_{4}^{-} + 5 F e^{2 +} + 8 H^{+} \to M n^{2 +} + 5 F e^{3 +} + 4 H_{2} O$ The amount (g) of hydrazine sulphate in one litre is

34.

A sample of hyhdrazine sulphate (N2H6SO4) was dissolved in 100 ml water. 10 ml of this solution was reacted with excess of solution and warmed to complete the reaction. Ferrous ions formed required 20 ml of solution. Given : 4Fe3++N2H4→N2+Fe2++4H+ MnO−4+5Fe2++8H+→Mn2++5Fe3++4H2O The amount (g) of hydrazine sulphate in one litre is

Answer»

A sample of hyhdrazine sulphate $(N_{2} H_{6} S O_{4})$ was dissolved in 100 ml water. 10 ml of this solution was reacted with excess of solution and warmed to complete the reaction. Ferrous ions formed required 20 ml of solution.
Given : $4 F e^{3 +} + N_{2} H_{4} \to N_{2} + F e^{2 +} + 4 H^{+}$
$M n O_{4}^{-} + 5 F e^{2 +} + 8 H^{+} \to M n^{2 +} + 5 F e^{3 +} + 4 H_{2} O$

The amount (g) of hydrazine sulphate in one litre is

Discussion

35.	Major product formed during the reaction between isobutyl bromide and benzene in presence of anhydrous AlCl3 is :
Answer» Major product formed during the reaction between isobutyl bromide and benzene in presence of anhydrous $A l C l_{3}$ is :

Discussion

36.	Nucleophilic substitution and elimination reactions of alkyl halides oftenly compete each other, elimination reactions are favoured under which condition.
Answer» Nucleophilic substitution and elimination reactions of alkyl halides oftenly compete each other, elimination reactions are favoured under which condition.

Discussion

37.	Which of the following are true?
Answer» Which of the following are true?

Discussion

38.	Complete the following equations : (i) Ag+PCl5→ (ii) CaF2+H2SO4→
Answer» Complete the following equations : (i) $A g + P C l_{5} \to$ (ii) $C a F_{2} + H_{2} S O_{4} \to$

Discussion

39.	Which of the following free radicals is pyramidal?
Answer» Which of the following free radicals is pyramidal?

Discussion

40.	The atomic radius in case of inert gasses is?
Answer» The atomic radius in case of inert gasses is?

Discussion

41.	Pauling’s polarity factor Δ is more for
Answer» Pauling’s polarity factor $Δ$ is more for

Discussion

42.	In a solution if the solute is non- volatile, pA0 is the vapour pressure of pure solvent A and the mole fraction of A is xA , the vapour pressure of the solvent (pA) will be :
Answer» In a solution if the solute is non- volatile, p_A⁰ is the vapour pressure of pure solvent A and the mole fraction of A is x_A , the vapour pressure of the solvent (p_A) will be :

Discussion

43.	In the compound CH3−CH=CH−CH2−C≡CH, the hybridisation of C₁, C₃ and C₅ bonds respectively is
Answer» In the compound $C H_{3} - C H = C H - C H_{2} - C \equiv C H$ , the hybridisation of C₁, C₃ and C₅ bonds respectively is

Discussion

44.	When 1 mole of oxalic acid is treated with excess of NaOH in dilute aqueous solution, 106 kJ of heat is liberated. Predict the enthalpy of ionization of the acid ?
Answer» When 1 mole of oxalic acid is treated with excess of NaOH in dilute aqueous solution, 106 kJ of heat is liberated. Predict the enthalpy of ionization of the acid ?

Discussion

45.	pπ−dπ back bonding cannot occur in:
Answer» $p π - d π$ back bonding cannot occur in:

Discussion

46.	The preparation of ethane by electrolysis of aqueous solution of potassium acetate is
Answer» The preparation of ethane by electrolysis of aqueous solution of potassium acetate is

Discussion

47.	A process cycle ABCA consisting of isothermal expansion AB, isobaric compression BC and adiabatic compression CA, for 1 mole of ideal gas is shown below. (Given: TA=TB=400K, λ=1.5;(2)13=1.26) Column IColumn IIColumn III(I)ΔQ=−247.5R(i)ΔU=165R(P)ΔW=165R(II)ΔQ=247.5R(ii)ΔU=−165R(Q)ΔW=400R(ln 2)(III)ΔQ=400R(ln 2)(iii)ΔU=82.5R(R)ΔW=−165R(IV)ΔQ=zero(iv)ΔU=zero(S)ΔW=−82.5R Which of the following is correct for process C→A?
Answer» A process cycle ABCA consisting of isothermal expansion AB, isobaric compression BC and adiabatic compression CA, for 1 mole of ideal gas is shown below. (Given: $T_{A} = T_{B} = 400 K, λ = 1.5; (2)^{\frac{1}{3}} = 1.26)$ $\begin{matrix} C o l u m n I & C o l u m n I I & C o l u m n I I I (I) & Δ Q = - 247.5 R & (i) & Δ U = 165 R & (P) & Δ W = 165 R (I I) & Δ Q = 247.5 R & (i i) & Δ U = - 165 R & (Q) & Δ W = 400 R (l n 2) (I I I) & Δ Q = 400 R (l n 2) & (i i i) & Δ U = 82.5 R & (R) & Δ W = - 165 R (I V) & Δ Q = z e r o & (i v) & Δ U = z e r o & (S) & Δ W = - 82.5 R \end{matrix}$ Which of the following is correct for process $C \to A$ ?

Discussion

48.	According to Bohr’s model of hydrogen atom
Answer» According to Bohr’s model of hydrogen atom

Discussion

49.	Natural rubber is :
Answer» Natural rubber is :

Discussion

50.	The experimental value of dipole moment of HCl is 1.05 D. The length of the H−Cl bond is 1.250 A∘. The percentage of ionic character in HCl is: (Given, 23.34=0.6)
Answer» The experimental value of dipole moment of $H C l$ is $1.05 D$ . The length of the $H - C l$ bond is $1.250 A^{\circ}$ . The percentage of ionic character in $H C l$ is: (Given, $\frac{2}{3.34} = 0.6$ )

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

For a phase change H2O(l)0 ∘C,1 bar⇌H2O(s)

Heavy water (D2O) is

Aqueous solution of HCl has the pH = 4. Its molarity would be

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s2 2s2 2p3, the simplest formula for this compound is:

Which of the following compounds will be suitable for Kjeldahl's method of nitrogen estimation?

Which of the following reactions will go faster if the concentration of the nucleophile is increased?

The standard redox potentials E0 of the following system are I.MnO−4+8H++5e−→Mn2++4H2OE0=1.5 V II. Sn2+→Sn4++2e−E0=−0.15 V III. Cr2O2−7+14H++6e−→2Cr2++7H2O E0=1.33 V IV. Ce3+→Ce4++e− E0=−1.61V The oxidizing power of the various species are related as

Which of the following is not a redox reaction:

Which of the following is a covalent crystal?

In the following reaction, the major product is

Which of the following is the correct order of the first ionisation energy?

The only correct combination for synthetic rubber

In pressure-volume diagram given below, the isochoric, isothermal, and isobaric parts respectively, are

In the given reaction CH3−CH2−COOH (i)AgNo3−−−−−−→(ii)Br2/△[x] X will be

The ionic radius of Cr is minimum in which of the following compounds?Why? A)CrO2 B)CrCl2 C)K2CrO4 D)CrF3

Which one of the following is not artificial sweetening agent?

Which statement is correct for inductive effect

For a body along the inclined plane, the normal reaction acts

Which of the following compounds wil exhibit geometrical isomerism?

What is propargyl halide?

The first ionization potential in electron volts of nitrogen and oxygen atoms respectively are given by

Halides of alkaline earth metals form hydrates such as MgCl2.6H2O,CaCl2.6H2O, BaCl2.2H2O and SrCl2.2H2O. This shows that halides of group 2 elements

1 mol each of AgNO3,CuSO4 and AlCl3 is electrolysed. Number of faradays required are in the ratio of :

The state in which 99% matter of the Universe exists is

A weak acid HA after treating with 12 mL of 0.1 M strong base BOH has a pH of 5. At the end point the volume of same base required is 26.6 mL. Calculate the Ka of an acid.

Addition of phosphate fertilizers into water leads to

Ecological sanitation is a sustainable system for handling human excreta using dry composting toilets. Such “ecosave” toilets are working in many areas of:

Do you expect the carbon hydrides of the type (CnH2n+2) to act as 'Lewis' acid or base? Justify your answer.

Arrange the following according to their increasing order of boiling points.

Major product formed during the reaction between isobutyl bromide and benzene in presence of anhydrous AlCl3 is :

Nucleophilic substitution and elimination reactions of alkyl halides oftenly compete each other, elimination reactions are favoured under which condition.

Which of the following are true?

Complete the following equations : (i) Ag+PCl5→ (ii) CaF2+H2SO4→

Which of the following free radicals is pyramidal?

The atomic radius in case of inert gasses is?

Pauling’s polarity factor Δ is more for

In a solution if the solute is non- volatile, pA0 is the vapour pressure of pure solvent A and the mole fraction of A is xA , the vapour pressure of the solvent (pA) will be :

In the compound CH3−CH=CH−CH2−C≡CH, the hybridisation of C₁, C₃ and C₅ bonds respectively is

When 1 mole of oxalic acid is treated with excess of NaOH in dilute aqueous solution, 106 kJ of heat is liberated. Predict the enthalpy of ionization of the acid ?

pπ−dπ back bonding cannot occur in:

The preparation of ethane by electrolysis of aqueous solution of potassium acetate is

According to Bohr’s model of hydrogen atom

Natural rubber is :

The experimental value of dipole moment of HCl is 1.05 D. The length of the H−Cl bond is 1.250 A∘. The percentage of ionic character in HCl is: (Given, 23.34=0.6)