46295 + Interview Questions in Chemistry

1.	A solution containing 10g per dm3 of urea(molecular mass = 60g mol-1) is isotonic with a 5%solution of a nonvolatile solute. The molecular massof this nonvolatile solute is(1) 250g mol-1(3) 350g mol-1(2) 300g mol-1(4) 200g mol-1
Answer» A solution containing 10g per dm3 of urea(molecular mass = 60g mol-1) is isotonic with a 5%solution of a nonvolatile solute. The molecular massof this nonvolatile solute is(1) 250g mol-1(3) 350g mol-1(2) 300g mol-1(4) 200g mol-1

Discussion

2.	Difference between Electric Potential and Potential difference.
Answer» Difference between Electric Potential and Potential difference.

Discussion

3.	14. Reaction with PhMgBr + (Ch3)Ch-OH gives: i)Phenol ii)Benzene iii)Ch3Ch2Ch3 iv)Ch3Ch(O-Ph)Ch3
Answer» 14. Reaction with PhMgBr + (Ch3)Ch-OH gives: i)Phenol ii)Benzene iii)Ch3Ch2Ch3 iv)Ch3Ch(O-Ph)Ch3

Discussion

4.	An enzyme contains 11.2%Fe by mass. The number of Fe atoms present in 1g of enzyme is
Answer» An enzyme contains 11.2%Fe by mass. The number of Fe atoms present in 1g of enzyme is

Discussion

5.	The ratio of the value of colligative properties ofK [Fe(CN)g](aq) to that of Fe [Fe(CN) 13(aq) is[Assuming 100% dissociation]
Answer» The ratio of the value of colligative properties of K [Fe(CN)g](aq) to that of Fe [Fe(CN) 13(aq) is [Assuming 100% dissociation]

Discussion

6.	Theactivation energy for the reaction2HI(g)→H2 +I2(g)is209.5 kJ mol−1at 581K. Calculate the fraction of molecules of reactants havingenergy equal to or greater than activation energy?
Answer» The activation energy for the reaction 2HI₍_g₎ → H₂ + I₂₍_g₎ is 209.5 kJ mol⁻¹ at 581K. Calculate the fraction of molecules of reactants having energy equal to or greater than activation energy?

6.

Theactivation energy for the reaction2HI(g)→H2 +I2(g)is209.5 kJ mol−1at 581K. Calculate the fraction of molecules of reactants havingenergy equal to or greater than activation energy?

Answer»

The
activation energy for the reaction

2HI₍_g₎
→
H₂ +
I₂₍_g₎

is
209.5 kJ mol⁻¹
at 581K. Calculate the fraction of molecules of reactants having
energy equal to or greater than activation energy?

Discussion

7.	In the figures given below, a doll is entrapped within a piston and cylinder containing gas. The initial and final conditions are shown as Fig. I and Fig. II respectively. The volume of doll is:
Answer» In the figures given below, a doll is entrapped within a piston and cylinder containing gas. The initial and final conditions are shown as Fig. I and Fig. II respectively. The volume of doll is:

Discussion

8.	49.Why nitrogen nitrogen bond length is small?
Answer» 49.Why nitrogen nitrogen bond length is small?

Discussion

9.	14. For whose ionisation , equilibrium constant is highest ? 1. HI 2.HBr 3.HCl 4.HF
Answer» 14. For whose ionisation , equilibrium constant is highest ? 1. HI 2.HBr 3.HCl 4.HF

Discussion

10.	In a cyclic process, work done by the system is
Answer» In a cyclic process, work done by the system is

Discussion

11.	The major product formed when the given product is dehydrohalogenated in polar protic solvent.
Answer» The major product formed when the given product is dehydrohalogenated in polar protic solvent.

Discussion

12.	Find n if 130 (n+2)! (n-1)! = (n+3)! n!
Answer» Find n if 130 (n+2)! (n-1)! = (n+3)! n!

Discussion

13.	Adsorption of gases on solid surface is generally exothermic because
Answer» Adsorption of gases on solid surface is generally exothermic because

Discussion

14.	The molecular formula for haematite is?
Answer» The molecular formula for haematite is?

Discussion

15.	Question 12 An unripe mango placed in a concentrated salt solution to prepare pickle shrivels because .............. . (a) it gains water due to osmosis (b) it loses water due to reverse osmosis (c) it gains water due to reverse osmosis (d) it loses water due to osmosis
Answer» Question 12 An unripe mango placed in a concentrated salt solution to prepare pickle shrivels because .............. . (a) it gains water due to osmosis (b) it loses water due to reverse osmosis (c) it gains water due to reverse osmosis (d) it loses water due to osmosis

Discussion

16.	A pellet of naphthalene of mass 1.28 g is burnt in a bomb calorimeter with heat capacity 14000 J/K. If the initial temperature is 300K and final temperature is 302K.The \|ΔHreaction\| for 1 mole of napthalene at 300 K in KJ/mole (consider reactant & products at 300K).[At. wt. of C = 12, CV,CO2(g)=35 Jmol−1K−1 and R=8.3 Jmol−1K−1At. wt. of H = 1, CV,H2O(i)=75 Jmol−1K−1, heat capacity of CO2(g) & H2O(l) are taken as constant in this temperature range].
Answer» A pellet of naphthalene of mass 1.28 g is burnt in a bomb calorimeter with heat capacity 14000 J/K. If the initial temperature is 300K and final temperature is 302K. The $\| Δ H_{r e a c t i o n} \|$ for 1 mole of napthalene at 300 K in KJ/mole (consider reactant & products at 300K). [At. wt. of C = 12, $C_{V, C O_{2} (g)} = 35 J m o l^{- 1} K^{- 1}$ and $R = 8.3 J m o l^{- 1} K^{- 1}$ At. wt. of H = 1, $C_{V, H_{2} O (i)} = 75 J m o l^{- 1} K^{- 1},$ heat capacity of $C O_{2} (g)$ & $H_{2} O (l)$ are taken as constant in this temperature range].

Discussion

17.	ntthe dihedral angle btw 2 C-H bonds in the staggered confirmation of Ethann nt180n nt120n nt60n nt0n
Answer» ntthe dihedral angle btw 2 C-H bonds in the staggered confirmation of Ethann nt180n nt120n nt60n nt0n

Discussion

18.	Write the structure of an isomer of compound C4H9Br, which is most reactive towards SN1 reaction.
Answer» Write the structure of an isomer of compound $C_{4} H_{9} B r$ , which is most reactive towards $S_{N} 1$ reaction.

Discussion

19.	{PbS reacts with ozone }(O_3) to form lead sulphate }}{(PbSO_4) and oxygen }(O_2) . As per balanced equation , molecules of ozone required for every molecule of PbS are :
Answer» {PbS reacts with ozone }(O_3) to form lead sulphate }}{(PbSO_4) and oxygen }(O_2) . As per balanced equation , molecules of ozone required for every molecule of PbS are :

Discussion

20.	The heat of combustion of carbon to CO2 is −393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is:
Answer» The heat of combustion of carbon to $C O_{2}$ is $- 393.5 k J / m o l$ . The heat released upon formation of $35.2 g$ of $C O_{2}$ from carbon and oxygen gas is:

Discussion

21.	which of the following compound does not exit? (1) SF6 (2) S2Cl2 (3) SCl2 (4) SeBr2
Answer» which of the following compound does not exit? (1) SF6 (2) S2Cl2 (3) SCl2 (4) SeBr2

Discussion

22.	The structure of Benzene was given by
Answer» The structure of Benzene was given by

Discussion

23.	The hydrocarbon containing a continuous chain which is isomeric with 2-methyl-3-ethylhexane is?
Answer» The hydrocarbon containing a continuous chain which is isomeric with 2-methyl-3-ethylhexane is?

Discussion

24.	0.9 g Al reacts with dil. HCl to give H2. The volume of H2 evolved at STP is [Atomic weight of Al=27]
Answer» 0.9 g Al reacts with dil. HCl to give H2. The volume of H2 evolved at STP is [Atomic weight of Al=27]

Discussion

25.	Which of the following set of quantum numbers is correct for an electron in 5d orbital?
Answer» Which of the following set of quantum numbers is correct for an electron in 5d orbital?

Discussion

26.	Harmful effect of smoking (cigarette) is
Answer» Harmful effect of smoking (cigarette) is

Discussion

27.	What are theca cells? Where are they located?
Answer» What are theca cells? Where are they located?

Discussion

28.	The graph between log x/m v/s log P is straight line inclined at an angle 45degree with intercept 0.30. What will be rate of adsorption at pressure 0.4atm.
Answer» The graph between log x/m v/s log P is straight line inclined at an angle 45degree with intercept 0.30. What will be rate of adsorption at pressure 0.4atm.

Discussion

29.	A partition divides a container having insulated walls into two compartments I and II. The same gas fills the two compartments [See Fig]. The ratio of the number of molecules in compartments I and II is
Answer» A partition divides a container having insulated walls into two compartments I and II. The same gas fills the two compartments [See Fig]. The ratio of the number of molecules in compartments I and II is

29.

A partition divides a container having insulated walls into two compartments I and II. The same gas fills the two compartments [See Fig]. The ratio of the number of molecules in compartments I and II is

Answer»

A partition divides a container having insulated walls into two compartments I and II. The same gas fills the two compartments [See Fig]. The ratio of the number of molecules in compartments I and II is

Discussion

30.	How many among the following amino acids are essential as well as contain a chiral carbon?Gly, Val, Leu, Arg, Lys, Thr, Met, Phe, Trp
Answer» How many among the following amino acids are essential as well as contain a chiral carbon? Gly, Val, Leu, Arg, Lys, Thr, Met, Phe, Trp

Discussion

31.	What are living organisms made up of
Answer» What are living organisms made up of

Discussion

32.	At what temperature (in centigrade) will the volume of a gas at 00C double itself while pressure remains constant?
Answer» At what temperature (in centigrade) will the volume of a gas at $0^{0}$ C double itself while pressure remains constant?

Discussion

33.	Statement I The first ionisation energy of Be is greater than that of B.Statement II 2p-orbital is lower in energy than 2s (J2000, (s), 1M)
Answer» Statement I The first ionisation energy of Be is greater than that of B. Statement II 2p-orbital is lower in energy than 2s (J2000, (s), 1M)

Discussion

34.	Can heat and work become equal under any condition during a chemical reaction ?
Answer» Can heat and work become equal under any condition during a chemical reaction ?

Discussion

35.	A given metal crystallizes out with a cubic structure having edge length of 361 pm. If there are four metal atoms in one unit cell, what is the radius of one atom?
Answer» A given metal crystallizes out with a cubic structure having edge length of 361 pm. If there are four metal atoms in one unit cell, what is the radius of one atom?

Discussion

36.	17. What is the product and Mecahnism of the reaction given below : CH3-CH=CH2 + CHCl3/peroxide -> ?
Answer» 17. What is the product and Mecahnism of the reaction given below : CH3-CH=CH2 + CHCl3/peroxide -> ?

Discussion

37.	In an enzyme solution, sucrose undergoes fermentation. If 0.10 M solution of sucrose is reduced to 0.05 M in 10 hours and to 0.025 M in 20 hours, what is the rate constant ?
Answer» In an enzyme solution, sucrose undergoes fermentation. If $0.10 M$ solution of sucrose is reduced to $0.05 M$ in $10$ hours and to $0.025 M$ in $20$ hours, what is the rate constant ?

Discussion

38.	The equilibrium constant for the reaction given below is 2.0×10−7 at 300 K. Calculate the standard free energy change for the reaction.PCl5(g)⇌PCl3(g)+Cl2(g)Also, calculate the standard entropy change if, ΔH∘=28.40 kJ mol−1
Answer» The equilibrium constant for the reaction given below is $2.0 \times 10^{- 7}$ at 300 K. Calculate the standard free energy change for the reaction. $P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)$ Also, calculate the standard entropy change if, $Δ H^{\circ} = 28.40 k J m o l^{- 1}$

Discussion

39.	Q. In which of the following process the value of magnetic moment is not changed 1] N2- N2+2] N2- N2-3] O2- O2+4] O2- O2-
Answer» Q. In which of the following process the value of magnetic moment is not changed 1] N2- N2+ 2] N2- N2- 3] O2- O2+ 4] O2- O2-

Discussion

40.	18. Assertion :Cp - Cv = R Reason : R is work done when temperature of one mole of ideal gas is increased by 1^°
Answer» 18. Assertion :Cp - Cv = R Reason : R is work done when temperature of one mole of ideal gas is increased by 1^°

Discussion

41.	The number of matter waves formed in 3rd Bohr's orbit of H-atom will be (1)1 (2)2 (3)3 (4)4
Answer» The number of matter waves formed in 3rd Bohr's orbit of H-atom will be (1)1 (2)2 (3)3 (4)4

Discussion

42.	In molecule NH4Cl is there any coordinate bond present or no
Answer» In molecule NH4Cl is there any coordinate bond present or no

Discussion

43.	25 mL of a solution of 2 m Na2CO3 having a specific gravity of 1.212 g/mL requires what volume of a solution of HCl, containing 18.25 g of the acid per litre, for complete neutralization?
Answer» $25 mL$ of a solution of $2 m$ $N a_{2} C O_{3}$ having a specific gravity of $1.212 g/mL$ requires what volume of a solution of $H C l$ , containing $18.25 g$ of the acid per litre, for complete neutralization?

Discussion

44.	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

45.	Which of the following has maximum number of unpaired electrons?(1)mn^(+2)(2)fe^(+2)(3)ni^(+2)(4)zn^(+2)
Answer» Which of the following has maximum number of unpaired electrons? (1)mn^(+2) (2)fe^(+2) (3)ni^(+2) (4)zn^(+2)

Discussion

46.	How many times does the electron go around the first orbit of hydrogen atom in one second?
Answer» How many times does the electron go around the first orbit of hydrogen atom in one second?

Discussion

47.	The arrangement of (CH3)3C−,(CH3)2CH−,CH3CH2− When attached to a benzene or an unsaturated group in increasing order of inductive effect is:
Answer» The arrangement of $(C H_{3})_{3} C -, (C H_{3})_{2} C H -, C H_{3} C H_{2} -$ When attached to a benzene or an unsaturated group in increasing order of inductive effect is:

Discussion

48.

Match the terms given in Column1 with the units in Column 2.Column 1Column 2 (p) Ecell(1) S cm−1(q) Cell constant(2) V(r) Conductivity(3) m−1(s) molar conductivity(4) S cm2 mol−1

Answer»

Match the terms given in $Column 1$ with the units in $Column 2$ .

$Column 1$	$Column 2$
$(p) E_{c e l l}$	$(1) {S cm}^{- 1}$
$(q) Cell constant$	$(2) V$
$(r) Conductivity$	$(3) m^{- 1}$
$(s) molar conductivity$	$(4) {S cm^{2} mol}^{- 1}$

Discussion

49.	The monomer of polyester is ___ .
Answer» The monomer of polyester is ___ .

Discussion

50.	For a first order reaction A(g)→2B(g)+C(g) at constant volume and 300 K, the total pressure at the beginning (t=0) and time t are Po and Pt respectively. Initially, only A is present with concentration [A]o and t1/2 is the time required for the partial pressure of A to reach a third of its initial value. The correct options are:(Assume that all these gases behave as ideal gaes)
Answer» For a first order reaction $A (g) \to 2 B (g) + C (g)$ at constant volume and 300 K, the total pressure at the beginning (t=0) and time t are $P_{o}$ and $P_{t}$ respectively. Initially, only $A$ is present with concentration $[A]_{o}$ and $t_{1 / 2}$ is the time required for the partial pressure of $A$ to reach a third of its initial value. The correct options are: (Assume that all these gases behave as ideal gaes)

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A solution containing 10g per dm3 of urea(molecular mass = 60g mol-1) is isotonic with a 5%solution of a nonvolatile solute. The molecular massof this nonvolatile solute is(1) 250g mol-1(3) 350g mol-1(2) 300g mol-1(4) 200g mol-1

Difference between Electric Potential and Potential difference.

14. Reaction with PhMgBr + (Ch3)Ch-OH gives: i)Phenol ii)Benzene iii)Ch3Ch2Ch3 iv)Ch3Ch(O-Ph)Ch3

An enzyme contains 11.2%Fe by mass. The number of Fe atoms present in 1g of enzyme is

The ratio of the value of colligative properties ofK [Fe(CN)g](aq) to that of Fe [Fe(CN) 13(aq) is[Assuming 100% dissociation]

Theactivation energy for the reaction2HI(g)→H2 +I2(g)is209.5 kJ mol−1at 581K. Calculate the fraction of molecules of reactants havingenergy equal to or greater than activation energy?

In the figures given below, a doll is entrapped within a piston and cylinder containing gas. The initial and final conditions are shown as Fig. I and Fig. II respectively. The volume of doll is:

49.Why nitrogen nitrogen bond length is small?

14. For whose ionisation , equilibrium constant is highest ? 1. HI 2.HBr 3.HCl 4.HF

In a cyclic process, work done by the system is

The major product formed when the given product is dehydrohalogenated in polar protic solvent.

Find n if 130 (n+2)! (n-1)! = (n+3)! n!

Adsorption of gases on solid surface is generally exothermic because

The molecular formula for haematite is?

Question 12 An unripe mango placed in a concentrated salt solution to prepare pickle shrivels because .............. . (a) it gains water due to osmosis (b) it loses water due to reverse osmosis (c) it gains water due to reverse osmosis (d) it loses water due to osmosis

ntthe dihedral angle btw 2 C-H bonds in the staggered confirmation of Ethann nt180n nt120n nt60n nt0n

Write the structure of an isomer of compound C4H9Br, which is most reactive towards SN1 reaction.

{PbS reacts with ozone }(O_3) to form lead sulphate }}{(PbSO_4) and oxygen }(O_2) . As per balanced equation , molecules of ozone required for every molecule of PbS are :

The heat of combustion of carbon to CO2 is −393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is:

which of the following compound does not exit? (1) SF6 (2) S2Cl2 (3) SCl2 (4) SeBr2

The structure of Benzene was given by

The hydrocarbon containing a continuous chain which is isomeric with 2-methyl-3-ethylhexane is?

0.9 g Al reacts with dil. HCl to give H2. The volume of H2 evolved at STP is [Atomic weight of Al=27]

Which of the following set of quantum numbers is correct for an electron in 5d orbital?

Harmful effect of smoking (cigarette) is

What are theca cells? Where are they located?

The graph between log x/m v/s log P is straight line inclined at an angle 45degree with intercept 0.30. What will be rate of adsorption at pressure 0.4atm.

A partition divides a container having insulated walls into two compartments I and II. The same gas fills the two compartments [See Fig]. The ratio of the number of molecules in compartments I and II is

How many among the following amino acids are essential as well as contain a chiral carbon?Gly, Val, Leu, Arg, Lys, Thr, Met, Phe, Trp

What are living organisms made up of

At what temperature (in centigrade) will the volume of a gas at 00C double itself while pressure remains constant?

Statement I The first ionisation energy of Be is greater than that of B.Statement II 2p-orbital is lower in energy than 2s (J2000, (s), 1M)

Can heat and work become equal under any condition during a chemical reaction ?

A given metal crystallizes out with a cubic structure having edge length of 361 pm. If there are four metal atoms in one unit cell, what is the radius of one atom?

17. What is the product and Mecahnism of the reaction given below : CH3-CH=CH2 + CHCl3/peroxide -> ?

In an enzyme solution, sucrose undergoes fermentation. If 0.10 M solution of sucrose is reduced to 0.05 M in 10 hours and to 0.025 M in 20 hours, what is the rate constant ?

The equilibrium constant for the reaction given below is 2.0×10−7 at 300 K. Calculate the standard free energy change for the reaction.PCl5(g)⇌PCl3(g)+Cl2(g)Also, calculate the standard entropy change if, ΔH∘=28.40 kJ mol−1

Q. In which of the following process the value of magnetic moment is not changed 1] N2- N2+2] N2- N2-3] O2- O2+4] O2- O2-

18. Assertion :Cp - Cv = R Reason : R is work done when temperature of one mole of ideal gas is increased by 1^°

The number of matter waves formed in 3rd Bohr's orbit of H-atom will be (1)1 (2)2 (3)3 (4)4

In molecule NH4Cl is there any coordinate bond present or no

25 mL of a solution of 2 m Na2CO3 having a specific gravity of 1.212 g/mL requires what volume of a solution of HCl, containing 18.25 g of the acid per litre, for complete neutralization?

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

Which of the following has maximum number of unpaired electrons?(1)mn^(+2)(2)fe^(+2)(3)ni^(+2)(4)zn^(+2)

How many times does the electron go around the first orbit of hydrogen atom in one second?

The arrangement of (CH3)3C−,(CH3)2CH−,CH3CH2− When attached to a benzene or an unsaturated group in increasing order of inductive effect is:

Match the terms given in Column1 with the units in Column 2.Column 1Column 2 (p) Ecell(1) S cm−1(q) Cell constant(2) V(r) Conductivity(3) m−1(s) molar conductivity(4) S cm2 mol−1

The monomer of polyester is ___ .