46295 + Interview Questions in Chemistry

1.	Two flasks A and B have equal volumes. A is maintained at 300 K and B at 600 K. While A contains H2 gas, B has an equal mass of CH4 gas. Assuming ideal behaviour for the both gases. find the ratio of (uavg)A:(uavg)B.
Answer» Two flasks $A$ and $B$ have equal volumes. $A$ is maintained at $300 K$ and $B$ at $600 K$ . While A contains $H_{2}$ gas, $B$ has an equal mass of $C H_{4}$ gas. Assuming ideal behaviour for the both gases. find the ratio of $(u_{avg})_{A} : (u_{avg})_{B}$ .

Discussion

2.	The normality of 0.3 M phosphorous acid is
Answer» The normality of $0.3 M$ phosphorous acid is

Discussion

3.	When to use which value of gas constant
Answer» When to use which value of gas constant

Discussion

4.	Prove the identity: 1cosec A−cot A−1sin A=1sin A=1cosec A+cot A [4 MARKS]
Answer» Prove the identity: $\frac{1}{c o s e c A - c o t A} - \frac{1}{s i n A} = \frac{1}{s i n A} = \frac{1}{c o s e c A + c o t A}$ [4 MARKS]

Discussion

5.	PbO + 2NaOH → ______ + H2O
Answer» $P b O + 2 N a O H \to$ ______ $+ H_{2} O$

Discussion

6.	Why concentrate H2SO4 and HNO3 are strong oxidising agent?
Answer» Why concentrate H2SO4 and HNO3 are strong oxidising agent?

Discussion

7.	In which of the following resonance will be possible?
Answer» In which of the following resonance will be possible?

Discussion

8.	3M 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 y and molar solubility of CaF2 in water is x, find the molar concentration of F− in resulting solution after equilibrium is attained.
Answer» $3 M$ 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 y and molar solubility of $C a F_{2}$ in water is x, find the molar concentration of $F^{-}$ in resulting solution after equilibrium is attained.

Discussion

9.	Why is order of boiling point of alcohols is 3°>2°>1° ?
Answer» Why is order of boiling point of alcohols is 3°>2°>1° ?

Discussion

10.	which gas is evolved at cathode during electolysis of an aqueus solution of Nacl?
Answer» which gas is evolved at cathode during electolysis of an aqueus solution of Nacl?

Discussion

11.	Most commercial hydrochloric acid is prepared by heating NaCl with concentrated H2SO4. How much sulphuric acid containing 90.0% H2SO4by mass is needed for the production of 200 kg of conc. HCl containing 42.0% HCl by mass?
Answer» Most commercial hydrochloric acid is prepared by heating NaCl with concentrated $H_{2} S O_{4}$ . How much sulphuric acid containing $90.0 %$ $H_{2} S O_{4}$ by mass is needed for the production of 200 kg of conc. HCl containing $42.0 %$ HCl by mass?

Discussion

12.	Which gas is used in the preparation of aerated waters like soda waters, lemonade etc?
Answer» Which gas is used in the preparation of aerated waters like soda waters, lemonade etc?

Discussion

13.	If the threshold frequency of a metal for photoelectric effect is v0, then which of the following will not happen?
Answer» If the threshold frequency of a metal for photoelectric effect is $v_{0}$ , then which of the following will not happen?

Discussion

14.	IN colloides ....in preferential adoption of ions ......plz explain this example ..that .. Fecl3 when added to hot water , a positively charged Sol of hydrated ferric oxide is formed due to adsorption. Of fe3+ ions ...... How ...??? ( Reffered from NCERT )
Answer» IN colloides ....in preferential adoption of ions ......plz explain this example ..that .. Fecl₃ when added to hot water , a positively charged Sol of hydrated ferric oxide is formed due to adsorption. Of fe³⁺ ions ...... How ...??? ( Reffered from NCERT )

Discussion

15.	Highest viscosity is exhibited by :
Answer» Highest viscosity is exhibited by :

Discussion

16.	Why in the case of H2O2 the oxidation state of Oxygen is -1? When we have to take the oxidation state for oxygen as -1?
Answer» Why in the case of H₂O₂the oxidation state of Oxygen is -1? When we have to take the oxidation state for oxygen as -1?

16.

Why in the case of H2O2 the oxidation state of Oxygen is -1? When we have to take the oxidation state for oxygen as -1?

Answer»

Why in the case of H₂O₂the oxidation state of Oxygen is -1?

When we have to take the oxidation state for oxygen as -1?

Discussion

17.	Regarding aniline the incorrect statement is
Answer» Regarding aniline the incorrect statement is

Discussion

18.	What happen if we pour HCL into H2 SO4
Answer» What happen if we pour HCL into H2 SO4

Discussion

19.	Calculate the normal freezing point of a sample of sea water containing 3.8 % nacl and 0.12 % of mgcl2 by mass given kf = 1.86 K kg/ mol molar mass of nacl 58.5 and mgcl2 95 g/mol
Answer» Calculate the normal freezing point of a sample of sea water containing 3.8 % nacl and 0.12 % of mgcl2 by mass given kf = 1.86 K kg/ mol molar mass of nacl 58.5 and mgcl2 95 g/mol

Discussion

20.	Why is p toluidine more basic than m toluidine?
Answer» Why is p toluidine more basic than m toluidine?

Discussion

21.	Collision diameter and mean free path all related as:
Answer» Collision diameter and mean free path all related as:

Discussion

22.	2 grams of Helium diffuses from a porous plate in 4min. How many grams of CH4 would diffuse through the same plate in same time under similar conditions?
Answer» 2 grams of Helium diffuses from a porous plate in 4min. How many grams of $C H_{4}$ would diffuse through the same plate in same time under similar conditions?

Discussion

23.	Molarity of 4% (w/v) solution of NaOH is
Answer» Molarity of 4% (w/v) solution of NaOH is

Discussion

24.	Cl2 + NaOH → NaCl + A–– + H2O A is (hot & conc)
Answer» $C l_{2} + N a O H \to N a C l + A - - + H_{2} O A$ is (hot & conc)

24.

Cl2 + NaOH → NaCl + A–– + H2O A is (hot & conc)

Answer»

$C l_{2} + N a O H \to N a C l + A - - + H_{2} O A$ is

(hot & conc)

Discussion

25.	The isomer of bromobutane with lowest boiling point is:
Answer» The isomer of bromobutane with lowest boiling point is:

Discussion

26.	Which one of the following is used as an insecticide?
Answer» Which one of the following is used as an insecticide?

Discussion

27.	Choose the correct statement regarding acidic character of acetic acid, CH3COOH and peroxyacetic acid, CH3COOOH
Answer» Choose the correct statement regarding acidic character of acetic acid, $C H_{3} C O O H$ and peroxyacetic acid, $C H_{3} C O O O H$

Discussion

28.	When sulphur in the form of S8 is heated at 900 K, the initial pressure of 1 atm falls by 20% at equilibrium. This is because of conversion of some S8 to S2. Find the value of equilibrium constant for this reaction.
Answer» When sulphur in the form of $S_{8}$ is heated at 900 $K$ , the initial pressure of 1 $atm$ falls by $20 %$ at equilibrium. This is because of conversion of some $S_{8}$ to $S_{2}$ . Find the value of equilibrium constant for this reaction.

Discussion

29.	Resistance of 0.2 M solution of an electrolyte is 50Ω.The specific conductance of the solution is 1.4 Sm−1. The resistance of 0.5 M solution of the same electrolyte is 280Ω. The molar conductivity of 0.5 M solution of the electrolyte in Sm2mol−1 is
Answer» Resistance of 0.2 M solution of an electrolyte is $50 Ω$ .The specific conductance of the solution is $1.4 S m^{- 1}$ . The resistance of 0.5 M solution of the same electrolyte is $280 Ω$ . The molar conductivity of 0.5 M solution of the electrolyte in $S m^{2} m o l^{- 1}$ is

Discussion

30.	For decolourization of 1 mole of KMnO4, the moles of H2O2 required is
Answer» For decolourization of 1 mole of $K M n O_{4}$ , the moles of $H_{2} O_{2}$ required is

Discussion

31.	[X]+H2SO4→Y, a colorless gas with irritating smell [Y]+K2Cr2O7+H2SO4→ Green solution, [X] and [Y] is
Answer» $[X] + H_{2} S O_{4} \to Y$ , a colorless gas with irritating smell $[Y] + K_{2} C r_{2} O_{7} + H_{2} S O_{4} \to$ Green solution, [X] and [Y] is

Discussion

32.	Suffix used for single bond, double bond and triple bond on carbon atoms respectively are:
Answer» Suffix used for single bond, double bond and triple bond on carbon atoms respectively are:

Discussion

33.	Which ore can be best concentrated by froth flotation process?
Answer» Which ore can be best concentrated by froth flotation process?

Discussion

34.	Keeping in view the periodic law and the periodic table suggest which of the following elements should have the maximum electronegative character
Answer» Keeping in view the periodic law and the periodic table suggest which of the following elements should have the maximum electronegative character

34.

Keeping in view the periodic law and the periodic table suggest which of the following elements should have the maximum electronegative character

Answer»

Keeping in view the periodic law and the periodic table suggest which of the following elements should have the maximum electronegative character

Discussion

35.	The Van't Hoff factor for the solution of BaCl2 is 2.74. The percentage of dissociation of salt is:
Answer» The Van't Hoff factor for the solution of BaCl₂ is 2.74. The percentage of dissociation of salt is:

Discussion

36.	At a given temperature, the equilibrium constant for reaction PCl5(g) ⇌ PCl3(g) + Cl2(g) is 2.4 × 10−3. At the same temperature, the equilibrium constant for reaction PCl3(g) + Cl2(g ⇌ (PCl5(g) is
Answer» At a given temperature, the equilibrium constant for reaction $P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)$ is $2.4 \times 10^{- 3}$ . At the same temperature, the equilibrium constant for reaction $P C l_{3} (g) + C l_{2} (g ⇌ (P C l_{5} (g)$ is

36.

At a given temperature, the equilibrium constant for reaction PCl5(g) ⇌ PCl3(g) + Cl2(g) is 2.4 × 10−3. At the same temperature, the equilibrium constant for reaction PCl3(g) + Cl2(g ⇌ (PCl5(g) is

Answer»

At a given temperature, the equilibrium constant for reaction

$P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)$ is $2.4 \times 10^{- 3}$ . At the same temperature, the

equilibrium constant for reaction $P C l_{3} (g) + C l_{2} (g ⇌ (P C l_{5} (g)$ is

Discussion

37.	1 mole of an ideal gas at 25∘C is subjected to expand reversibly ten times of its initial volume. The change in entropy due to expansion is:
Answer» 1 mole of an ideal gas at $25^{\circ} C$ is subjected to expand reversibly ten times of its initial volume. The change in entropy due to expansion is:

Discussion

38.	The concentration in gms per litre of a solution of cane sugar (M=342) which is isotonic with a solution containing 6 gms of urea (M = 60) per litre is:
Answer» The concentration in gms per litre of a solution of cane sugar (M=342) which is isotonic with a solution containing 6 gms of urea (M = 60) per litre is:

Discussion

39.	Compound formed by sp3 dhybridization will have structure
Answer» Compound formed by $s p^{3}$ dhybridization will have structure

Discussion

40.	Heat of formation of CH4 is: If given: C(s)+O2(g)→CO2(g) △H=−394 kJ H2(g)+12O2(g)→H2O(l) △H=−284 kJ CH4(g)+2O2(g)→CO2(g)+2H2O(l) △H=−892 kJ
Answer» Heat of formation of $C H_{4}$ is: If given: $C (s) + O_{2} (g) \to C O_{2} (g) △ H = - 394 k J$ $H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l) △ H = - 284 k J$ $C H_{4} (g) + 2 O_{2} (g) \to C O_{2} (g) + 2 H_{2} O (l) △ H = - 892 k J$

40.

Heat of formation of CH4 is: If given: C(s)+O2(g)→CO2(g) △H=−394 kJ H2(g)+12O2(g)→H2O(l) △H=−284 kJ CH4(g)+2O2(g)→CO2(g)+2H2O(l) △H=−892 kJ

Answer»

Heat of formation of $C H_{4}$ is:

If given:

$C (s) + O_{2} (g) \to C O_{2} (g) △ H = - 394 k J$

$H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l) △ H = - 284 k J$

$C H_{4} (g) + 2 O_{2} (g) \to C O_{2} (g) + 2 H_{2} O (l) △ H = - 892 k J$

Discussion

41.	2NaHCO3 250∘C−−−−→ _______ +H2O+CO2
Answer» $2 N a H C O_{3} 250^{\circ} C - --- \to$ _______ $+ H_{2} O + C O_{2}$

Discussion

42.	An alkali metal hybride(NaH) reacts with diborane in ‘A’ to give a tetrahedral compound ‘B’ which is extensively used as reducing agent in organic synthesis. The compounds ‘A’ and ‘B’ respectively are
Answer» An alkali metal hybride(NaH) reacts with diborane in ‘A’ to give a tetrahedral compound ‘B’ which is extensively used as reducing agent in organic synthesis. The compounds ‘A’ and ‘B’ respectively are

Discussion

43.	The emf of the three galvanic cells: (i) Zn\|Zn2+ (1 M)\|\|Cu2+ (1 M)\|Cu (ii) Zn\|Zn2+ (0.1 M)\|\|Cu2+ (1 M)\|Cu (iii) Zn\|Zn2+ (1 M)\|\|Cu2+ (0.1 M)\|Cu are represented by E1, E2 and E3 respectively. Which of the following is true?
Answer» The emf of the three galvanic cells: (i) $Z n \| Z n^{2 +} (1 M) \| \| C u^{2 +} (1 M) \| C u$ (ii) $Z n \| Z n^{2 +} (0.1 M) \| \| C u^{2 +} (1 M) \| C u$ (iii) $Z n \| Z n^{2 +} (1 M) \| \| C u^{2 +} (0.1 M) \| C u$ are represented by $E_{1}$ , $E_{2}$ and $E_{3}$ respectively. Which of the following is true?

Discussion

44.	In presence of HCl, H2S results the precipitation of Group – 2 elements but no Gp – 4 elements during quantitative analysis. It is due to
Answer» In presence of HCl, $H_{2} S$ results the precipitation of Group – 2 elements but no Gp – 4 elements during quantitative analysis. It is due to

Discussion

45.	Which of the following cannot be used for the preparation of H2
Answer» Which of the following cannot be used for the preparation of $H_{2}$

Discussion

46.	Which compound is highest covalent
Answer» Which compound is highest covalent

Discussion

47.	Which of the following alkyl halide is hydrolysed by SN1 mechanism?
Answer» Which of the following alkyl halide is hydrolysed by $S N^{1}$ mechanism?

Discussion

48.	Math the compounds given in column I with hybridization and shape in column II Column I Column II (A) XeF6 (1) sp3d3 – distorted octahedral (B) XeO3 (2) sp3d2 – square planar (C) XeOF4 (3) sp3 – pyramidal (D) XeF4 (4) sp3d2 – square pyramidal
Answer» Math the compounds given in column I with hybridization and shape in column II Column I Column II (A) $X e F_{6}$ (1) $s p^{3} d^{3}$ – distorted octahedral (B) $X e O_{3}$ (2) $s p^{3} d^{2}$ – square planar (C) $X e O F_{4}$ (3) $s p^{3}$ – pyramidal (D) $X e F_{4}$ (4) $s p^{3} d^{2}$ – square pyramidal

48.

Math the compounds given in column I with hybridization and shape in column II Column I Column II (A) XeF6 (1) sp3d3 – distorted octahedral (B) XeO3 (2) sp3d2 – square planar (C) XeOF4 (3) sp3 – pyramidal (D) XeF4 (4) sp3d2 – square pyramidal

Answer»

Math the compounds given in column I with hybridization and shape in column II

Column I Column II

(A) $X e F_{6}$ (1) $s p^{3} d^{3}$ – distorted octahedral

(B) $X e O_{3}$ (2) $s p^{3} d^{2}$ – square planar

(C) $X e O F_{4}$ (3) $s p^{3}$ – pyramidal

(D) $X e F_{4}$ (4) $s p^{3} d^{2}$ – square pyramidal

Discussion

49.	IUPAC name of the compound CH3−CH\|CH3−OCH3 is . . . . (a) 1-methoxy-1-methylethane (b) 2-methoxy-2-methylethane (c) 2-methoxypropane (d) isopropylmethyl ether
Answer» IUPAC name of the compound $C H_{3} - C H \| C H_{3} - O C H_{3}$ is . . . . (a) 1-methoxy-1-methylethane (b) 2-methoxy-2-methylethane (c) 2-methoxypropane (d) isopropylmethyl ether

Discussion

50.	Which of the following compounds exhibits Schottky defect?
Answer» Which of the following compounds exhibits Schottky defect?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Two flasks A and B have equal volumes. A is maintained at 300 K and B at 600 K. While A contains H2 gas, B has an equal mass of CH4 gas. Assuming ideal behaviour for the both gases. find the ratio of (uavg)A:(uavg)B.

The normality of 0.3 M phosphorous acid is

When to use which value of gas constant

Prove the identity: 1cosec A−cot A−1sin A=1sin A=1cosec A+cot A [4 MARKS]

PbO + 2NaOH → ______ + H2O

Why concentrate H2SO4 and HNO3 are strong oxidising agent?

In which of the following resonance will be possible?

Why is order of boiling point of alcohols is 3°&gt;2°&gt;1° ?

which gas is evolved at cathode during electolysis of an aqueus solution of Nacl?

Most commercial hydrochloric acid is prepared by heating NaCl with concentrated H2SO4. How much sulphuric acid containing 90.0% H2SO4by mass is needed for the production of 200 kg of conc. HCl containing 42.0% HCl by mass?

Which gas is used in the preparation of aerated waters like soda waters, lemonade etc?

If the threshold frequency of a metal for photoelectric effect is v0, then which of the following will not happen?

IN colloides ....in preferential adoption of ions ......plz explain this example ..that .. Fecl3 when added to hot water , a positively charged Sol of hydrated ferric oxide is formed due to adsorption. Of fe3+ ions ...... How ...??? ( Reffered from NCERT )

Highest viscosity is exhibited by :

Why in the case of H2O2 the oxidation state of Oxygen is -1? When we have to take the oxidation state for oxygen as -1?

Regarding aniline the incorrect statement is

What happen if we pour HCL ​​​​​into H2 SO4

Calculate the normal freezing point of a sample of sea water containing 3.8 % nacl and 0.12 % of mgcl2 by mass given kf = 1.86 K kg/ mol molar mass of nacl 58.5 and mgcl2 95 g/mol

Why is p toluidine more basic than m toluidine?

Collision diameter and mean free path all related as:

2 grams of Helium diffuses from a porous plate in 4min. How many grams of CH4 would diffuse through the same plate in same time under similar conditions?

Molarity of 4% (w/v) solution of NaOH is

Cl2 + NaOH → NaCl + A–– + H2O A is (hot &amp; conc)

The isomer of bromobutane with lowest boiling point is:

Which one of the following is used as an insecticide?

Choose the correct statement regarding acidic character of acetic acid, CH3COOH and peroxyacetic acid, CH3COOOH

When sulphur in the form of S8 is heated at 900 K, the initial pressure of 1 atm falls by 20% at equilibrium. This is because of conversion of some S8 to S2. Find the value of equilibrium constant for this reaction.

Resistance of 0.2 M solution of an electrolyte is 50Ω.The specific conductance of the solution is 1.4 Sm−1. The resistance of 0.5 M solution of the same electrolyte is 280Ω. The molar conductivity of 0.5 M solution of the electrolyte in Sm2mol−1 is

For decolourization of 1 mole of KMnO4, the moles of H2O2 required is

[X]+H2SO4→Y, a colorless gas with irritating smell [Y]+K2Cr2O7+H2SO4→ Green solution, [X] and [Y] is

Suffix used for single bond, double bond and triple bond on carbon atoms respectively are:

Which ore can be best concentrated by froth flotation process?

Keeping in view the periodic law and the periodic table suggest which of the following elements should have the maximum electronegative character

The Van't Hoff factor for the solution of BaCl2 is 2.74. The percentage of dissociation of salt is:

At a given temperature, the equilibrium constant for reaction PCl5(g) ⇌ PCl3(g) + Cl2(g) is 2.4 × 10−3. At the same temperature, the equilibrium constant for reaction PCl3(g) + Cl2(g ⇌ (PCl5(g) is

1 mole of an ideal gas at 25∘C is subjected to expand reversibly ten times of its initial volume. The change in entropy due to expansion is:

The concentration in gms per litre of a solution of cane sugar (M=342) which is isotonic with a solution containing 6 gms of urea (M = 60) per litre is:

Compound formed by sp3 dhybridization will have structure

Heat of formation of CH4 is: If given: C(s)+O2(g)→CO2(g) △H=−394 kJ H2(g)+12O2(g)→H2O(l) △H=−284 kJ CH4(g)+2O2(g)→CO2(g)+2H2O(l) △H=−892 kJ

2NaHCO3 250∘C−−−−→ _______ +H2O+CO2

An alkali metal hybride(NaH) reacts with diborane in ‘A’ to give a tetrahedral compound ‘B’ which is extensively used as reducing agent in organic synthesis. The compounds ‘A’ and ‘B’ respectively are

The emf of the three galvanic cells: (i) Zn|Zn2+ (1 M)||Cu2+ (1 M)|Cu (ii) Zn|Zn2+ (0.1 M)||Cu2+ (1 M)|Cu (iii) Zn|Zn2+ (1 M)||Cu2+ (0.1 M)|Cu are represented by E1, E2 and E3 respectively. Which of the following is true?

In presence of HCl, H2S results the precipitation of Group – 2 elements but no Gp – 4 elements during quantitative analysis. It is due to

Which of the following cannot be used for the preparation of H2

Which compound is highest covalent

Which of the following alkyl halide is hydrolysed by SN1 mechanism?

Math the compounds given in column I with hybridization and shape in column II Column I Column II (A) XeF6 (1) sp3d3 – distorted octahedral (B) XeO3 (2) sp3d2 – square planar (C) XeOF4 (3) sp3 – pyramidal (D) XeF4 (4) sp3d2 – square pyramidal

IUPAC name of the compound CH3−CH|CH3−OCH3 is . . . . (a) 1-methoxy-1-methylethane (b) 2-methoxy-2-methylethane (c) 2-methoxypropane (d) isopropylmethyl ether

Which of the following compounds exhibits Schottky defect?

Why is order of boiling point of alcohols is 3°>2°>1° ?

What happen if we pour HCL into H2 SO4

Cl2 + NaOH → NaCl + A–– + H2O A is (hot & conc)