46295 + Interview Questions in Chemistry

1.	Which of the following compounds will give a yellow precipitate with iodine and alkali?
Answer» Which of the following compounds will give a yellow precipitate with iodine and alkali?

Discussion

2.	Predict the order of Δo for the following compounds:- (i) [Cr(H2O)6]3+ (ii) [Cr(CN)2(H2O)4]− (iii) [Cr(CN)4(H2O)2]− (iv) [Cr(CN)6]3−
Answer» Predict the order of $Δ_{o}$ for the following compounds:- (i) $[C r (H_{2} O)_{6}]^{3 +}$ (ii) $[C r (C N)_{2} (H_{2} O)_{4}]^{-}$ (iii) $[C r (C N)_{4} (H_{2} O)_{2}]^{-}$ (iv) $[C r (C N)_{6}]^{3 -}$

Discussion

3.	AnilineCHCl3, KOH−−−−−−−−→ΔXLiAlH4−−−−→Y (Y) is:
Answer» $Aniline C H C l_{3}, K O H - ------- \to Δ X L i A l H_{4} - --- \to Y$ $(Y)$ is:

Discussion

4.	A solution is 25% H2O, 25% ethanol and 50% acetic acid by mass .Calculate the mole fraction of ethanol and acetic acid in the solution
Answer» A solution is 25% H2O, 25% ethanol and 50% acetic acid by mass .Calculate the mole fraction of ethanol and acetic acid in the solution

Discussion

5.	What is planarity
Answer» What is planarity

Discussion

6.	The values of IP1,IP2,IP3 and IP4 of an atom are 7.5 eV, 25.6 eV, 48.6 eV and 170.6 eV respectively. The electronic configuration of the atom will be:
Answer» The values of $I P_{1}, I P_{2}, I P_{3}$ and $I P_{4}$ of an atom are $7.5 e V, 25.6 e V, 48.6 e V$ and $170.6 e V$ respectively. The electronic configuration of the atom will be:

Discussion

7.	Predict the major product.
Answer» Predict the major product.

Discussion

8.	Which one of the following pairs of solution can we expect to be isotonic at the same temperature
Answer» Which one of the following pairs of solution can we expect to be isotonic at the same temperature

Discussion

9.	Propan-1-ol and propan-2-ol can be distinguished by
Answer» Propan-1-ol and propan-2-ol can be distinguished by

Discussion

10.	When treated with ammoniacal cuprous chloride, which one among the following forms copper derivative?
Answer» When treated with ammoniacal cuprous chloride, which one among the following forms copper derivative?

Discussion

11.	The mole fraction of a solute in a solution is 0.1. At 298 K, molarity of this solution is the same as its molality. Density of this solution at 298 K is 2.0 g cm−3. The ratio of the molecular weights of the solute and solvent, (MWsoluteMWsolvent), is
Answer» The mole fraction of a solute in a solution is 0.1. At 298 K, molarity of this solution is the same as its molality. Density of this solution at 298 K is 2.0 g $c m^{- 3}$ . The ratio of the molecular weights of the solute and solvent, $(\frac{M W_{s o l u t e}}{M W_{s o l v e n t}})$ , is

Discussion

12.	16 moles of H2 and 4 moles of N2 are sealed in a one litre vessel. The vessel is heated at a constnat temperature until the equilibrium is established, it is found that the pressure in the vessel has fallen to 9/10 of its original value. Calculate newly concentration of N2 and NH3 in mol L−1 N2(g)+3H2(g)⇌2NH3(g)
Answer» 16 moles of $H_{2}$ and 4 moles of $N_{2}$ are sealed in a one litre vessel. The vessel is heated at a constnat temperature until the equilibrium is established, it is found that the pressure in the vessel has fallen to 9/10 of its original value. Calculate newly concentration of $N_{2}$ and $N H_{3}$ in $m o l L^{- 1}$ $N_{2 (g)} + 3 H_{2 (g)} ⇌ 2 N H_{3 (g)}$

Discussion

13.	The Copper(I) ion forms a complex ion with CN− according to the following equation: Cu+(aq)+3CN−(aq)⇌[Cu(CN)3]2−(aq); K=1.0×1011 The concentration of CN− at equilibrium when 1.0 M NaCN (1 L) is added to a sufficient amount of CuBr(s) was found to be x×10−3 M. The value of x is Ksp=1×10−5
Answer» The Copper(I) ion forms a complex ion with $C N^{-}$ according to the following equation: $C u^{+} (a q) + 3 C N^{-} (a q) ⇌ [C u (C N)_{3}]^{2 -} (a q); K = 1.0 \times 10^{11}$ The concentration of $C N^{-}$ at equilibrium when 1.0 M $N a C N$ (1 L) is added to a sufficient amount of $C u B r (s)$ was found to be $x \times 10^{- 3} M$ . The value of $x$ is $K_{s p} = 1 \times 10^{- 5}$

Discussion

14.	According to Oparin, which one of the following was not present in the primitive atmosphere of Earth?
Answer» According to Oparin, which one of the following was not present in the primitive atmosphere of Earth?

Discussion

15.	Which of the following is not a linear molecule?
Answer» Which of the following is not a linear molecule?

Discussion

16.	Which of the following reactions is/are possible?
Answer» Which of the following reactions is/are possible?

Discussion

17.	Carbon-11 decays to boron-11 according to the following formula. 116C→115B+e++ve+0.96MeV Assume that positrons (e+) produced in the decay combine with free electrons in the atmosphere and annihilate each other almost immediately. Also assume that the neutrinos (ve) are massless and do not intersect with the environment. At t = 0 we have 1 μg of 126C If the half-life of the decay process is t0, the net energy produced between time t = 0 and t=2t0 will be nearly
Answer» Carbon-11 decays to boron-11 according to the following formula. $_{6}^{11} C \to_{5}^{11} B + e^{+} + v_{e} + 0.96 M e V$ Assume that positrons $(e^{+})$ produced in the decay combine with free electrons in the atmosphere and annihilate each other almost immediately. Also assume that the neutrinos $(v_{e})$ are massless and do not intersect with the environment. At t = 0 we have 1 $μ g$ of $_{6}^{12} C$ If the half-life of the decay process is $t_{0}$ , the net energy produced between time t = 0 and $t = 2 t_{0}$ will be nearly

Discussion

18.	A monoatomic ideal gas follows the process: TV32=constant The molar specific heat for this process is (5Ry), where R is gas constant. Then the value of ‘y’ is ___ .
Answer» A monoatomic ideal gas follows the process: ${TV}^{\frac{3}{2}} = constant$ The molar specific heat for this process is $(\frac{5 R}{y})$ , where R is gas constant. Then the value of ‘y’ is ___ .

18.

A monoatomic ideal gas follows the process: TV32=constant The molar specific heat for this process is (5Ry), where R is gas constant. Then the value of ‘y’ is ___ .

Answer»

A monoatomic ideal gas follows the process:

${TV}^{\frac{3}{2}} = constant$

The molar specific heat for this process is $(\frac{5 R}{y})$ , where R is gas constant. Then the value of ‘y’ is ___ .

Discussion

19.	Let nr and nb be respectively the number of photons emitted by a red bulb and a blue bulb of equal power in one second.
Answer» Let $n_{r}$ and $n_{b}$ be respectively the number of photons emitted by a red bulb and a blue bulb of equal power in one second.

Discussion

20.	The first and the second ionisation energies of magnesium are 7.646 eV and 15.035 eV respectively. The amount of energy in kJ needed to convert all the atoms of magnesium into Mg2+ ions present in 24 mg of magnesium vapour will be: (Given 1 eV=96.5 kJmol–1).
Answer» The first and the second ionisation energies of magnesium are 7.646 eV and 15.035 eV respectively. The amount of energy in kJ needed to convert all the atoms of magnesium into $M g^{2 +}$ ions present in 24 mg of magnesium vapour will be: (Given $1 e V = 96.5 k J m o l^{- 1}$ ).

Discussion

21.	Iodine molecule dissociates into atoms after absorbing light of 4500 oA . If one quantum of radiation is absorbed by each molecule. Calculate the kinetic energy of iodine atoms (bond energy of I2=240 kJmol−1)
Answer» Iodine molecule dissociates into atoms after absorbing light of 4500 $o A$ . If one quantum of radiation is absorbed by each molecule. Calculate the kinetic energy of iodine atoms (bond energy of $I_{2} = 240 k J m o l^{- 1}$ )

Discussion

22.	Calculate the lattice enthalpy in kJ mol−1of LiF given that Sublimation of lithium is 155.3 kJ mol−1 Dissociation of half mole of F2=75.3 kJ Ionization enthalpy of lithium =520 kJ mol−1 Electron gain enthalpy of 1 mol of F(g) =−333 kJΔfHoverall=−594 kJ mol−1
Answer» Calculate the lattice enthalpy in $k J m o l^{- 1}$ of $L i F$ given that Sublimation of lithium is $155.3 k J m o l^{- 1}$ Dissociation of half mole of $F_{2} = 75.3 k J$ Ionization enthalpy of lithium $= 520 k J m o l^{- 1}$ Electron gain enthalpy of 1 mol of $F (g) = - 333 k J Δ_{f} H_{o v e r a l l} = - 594 k J m o l^{- 1}$

Discussion

23.	Electrons are emitted when a photosensitive surface illuminated by green light but electron emission does not take place by yellow light will the electrons be emitted when the surface is illuminated by a) red light b) blue light
Answer» Electrons are emitted when a photosensitive surface illuminated by green light but electron emission does not take place by yellow light will the electrons be emitted when the surface is illuminated by a) red light b) blue light

Discussion

24.	The wavelength of the first line of the Balmer series of He+ ion is x times the last line . x is
Answer» The wavelength of the first line of the Balmer series of $H e^{+}$ ion is x times the last line . x is

Discussion

25.	The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is
Answer» The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is

Discussion

26.	Out of the following carbocations, how many are more stable than the benzyl carbocation?
Answer» Out of the following carbocations, how many are more stable than the benzyl carbocation?

Discussion

27.	Name the products formed when ethane burns in air. Write the balanced chemical equation for the reaction showing the types of energies liberated.
Answer» Name the products formed when ethane burns in air. Write the balanced chemical equation for the reaction showing the types of energies liberated.

Discussion

28.	Is there any formula to find the number of isomers for compound containing halogen , nitrogen and oxygen
Answer» Is there any formula to find the number of isomers for compound containing halogen , nitrogen and oxygen

Discussion

29.	The number of moles of electrons present in 3.0115×1024 particles of CO is:
Answer» The number of moles of electrons present in $3.0115 \times 10^{24}$ particles of $C O$ is:

Discussion

30.	The mole fraction of a solute in a solution of n-heptane is 0.25. The molality of the solution will be: [Report the answer upto two decimal place]
Answer» The mole fraction of a solute in a solution of n-heptane is $0.25$ . The molality of the solution will be: [Report the answer upto two decimal place]

Discussion

31.	When Sn reacts with calculated amount of HgCl2 and excess HgCl2, then the product will be respectively.
Answer» When Sn reacts with calculated amount of $H g C l_{2}$ and excess $H g C l_{2}$ , then the product will be respectively.

Discussion

32.	Calculate the energy associated with photon of light having a wavelength 6000 oA. [h= 6.626×10−27 erg s]
Answer» Calculate the energy associated with photon of light having a wavelength 6000 $o A$ . [h= $6.626 \times 10^{- 27} e r g s$ ]

Discussion

33.	Which one is electrophilic addition
Answer» Which one is electrophilic addition

33.

Which one is electrophilic addition

Answer»

Which one is electrophilic addition

Discussion

34.	What is Van Der Waal forces I cannot understand that. Andnd also what is the grafene
Answer» What is Van Der Waal forces I cannot understand that. Andnd also what is the grafene

Discussion

35.	An accident in a nuclear laboratory resulted in deposition of a certain amount of radioactive material of half-life 18 days inside the laboratory. Tests revealed that the radiation was 64 times more than the permissible level required for safe operation of the laboratory. What is the minimum number of days after which the laboratory can be considered safe for use?
Answer» An accident in a nuclear laboratory resulted in deposition of a certain amount of radioactive material of half-life $18$ days inside the laboratory. Tests revealed that the radiation was $64$ times more than the permissible level required for safe operation of the laboratory. What is the minimum number of days after which the laboratory can be considered safe for use?

Discussion

36.	For the given reactions ,the name of the reaction which isn't correctly matched is :
Answer» For the given reactions ,the name of the reaction which isn't correctly matched is :

Discussion

37.	Which of the following enhances the leathering property of soap? (a) Sodium carbonate (b) Sodium rosinate (c) Sodium stearate (d) Trisodium phosphate
Answer» Which of the following enhances the leathering property of soap? (a) Sodium carbonate (b) Sodium rosinate (c) Sodium stearate (d) Trisodium phosphate

Discussion

38.	Incorrect order in the following
Answer» Incorrect order in the following

Discussion

39.	Which of the following compound will answer lassaigne's test for nitrogen?
Answer» Which of the following compound will answer lassaigne's test for nitrogen?

Discussion

40.	Which of the following is used as a catalyst in Haber's process?
Answer» Which of the following is used as a catalyst in Haber's process?

Discussion

41.	The correct decreasing order of reactivity among the following is
Answer» The correct decreasing order of reactivity among the following is

Discussion

42.	If B–Cl bond has a dipole moment, explain why BCl3 molecule has zero dipole moment.
Answer» If B–Cl bond has a dipole moment, explain why $B C l_{3}$ molecule has zero dipole moment.

Discussion

43.	What are the three steps in the scientific method
Answer» What are the three steps in the scientific method

Discussion

44.	The oxidation state of oxygen in superoxide is
Answer» The oxidation state of oxygen in superoxide is

Discussion

45.	Account for the following: (a) Aromatic carboxylic acids do not undergo Friedel-Crafts reaction. (b) pKa value of 4-nitrobenzoic acid is lower than that of benzoic acid.
Answer» Account for the following: (a) Aromatic carboxylic acids do not undergo Friedel-Crafts reaction. (b) $p K_{a}$ value of 4-nitrobenzoic acid is lower than that of benzoic acid.

Discussion

46.	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

47.	What do you expect the nature of hydrides is, if formed by elements of atomic numbers 15, 19, 23 and 44 with dihydrogen? Compare their behaviour towards water.
Answer» What do you expect the nature of hydrides is, if formed by elements of atomic numbers 15, 19, 23 and 44 with dihydrogen? Compare their behaviour towards water.

Discussion

48.	An element crystallises in a structure having F.C.C unit cell of an edge 200 pm, 200 gm of it contains 24 ×1023 atoms. What is the density?
Answer» An element crystallises in a structure having F.C.C unit cell of an edge 200 pm, 200 gm of it contains 24 $\times 10^{23}$ atoms. What is the density?

Discussion

49.	A gas occupies a volume of 2.5 L at 9×105Nm−2. Calculate the additional pressure required to decrease the volume of the gas to 1.51. Assume temperature is constant.
Answer» A gas occupies a volume of 2.5 L at $9 \times 10^{5} N m^{- 2}$ . Calculate the additional pressure required to decrease the volume of the gas to 1.51. Assume temperature is constant.

Discussion

50.	(a) Explain ‘Kohlrausch law of independent migration of ions’ with suitable examples (b) A solution of CuSO4 is electrolysed for 10 minutes with a current of 1.5 amperes. What is the mass of copper deposited at the cathode?
Answer» (a) Explain ‘Kohlrausch law of independent migration of ions’ with suitable examples (b) A solution of $C u S O_{4}$ is electrolysed for 10 minutes with a current of 1.5 amperes. What is the mass of copper deposited at the cathode?

50.

(a) Explain ‘Kohlrausch law of independent migration of ions’ with suitable examples (b) A solution of CuSO4 is electrolysed for 10 minutes with a current of 1.5 amperes. What is the mass of copper deposited at the cathode?

Answer»

(a) Explain ‘Kohlrausch law of independent migration of ions’ with suitable examples

(b) A solution of $C u S O_{4}$ is electrolysed for 10 minutes with a current of 1.5 amperes. What is the mass of copper deposited at the cathode?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which of the following compounds will give a yellow precipitate with iodine and alkali?

Predict the order of Δo for the following compounds:- (i) [Cr(H2O)6]3+ (ii) [Cr(CN)2(H2O)4]− (iii) [Cr(CN)4(H2O)2]− (iv) [Cr(CN)6]3−

AnilineCHCl3, KOH−−−−−−−−→ΔXLiAlH4−−−−→Y (Y) is:

A solution is 25% H2O, 25% ethanol and 50% acetic acid by mass .Calculate the mole fraction of ethanol and acetic acid in the solution

What is planarity

The values of IP1,IP2,IP3 and IP4 of an atom are 7.5 eV, 25.6 eV, 48.6 eV and 170.6 eV respectively. The electronic configuration of the atom will be:

Predict the major product.

Which one of the following pairs of solution can we expect to be isotonic at the same temperature

Propan-1-ol and propan-2-ol can be distinguished by

When treated with ammoniacal cuprous chloride, which one among the following forms copper derivative?

The mole fraction of a solute in a solution is 0.1. At 298 K, molarity of this solution is the same as its molality. Density of this solution at 298 K is 2.0 g cm−3. The ratio of the molecular weights of the solute and solvent, (MWsoluteMWsolvent), is

According to Oparin, which one of the following was not present in the primitive atmosphere of Earth?

Which of the following is not a linear molecule?

Which of the following reactions is/are possible?

A monoatomic ideal gas follows the process: TV32=constant The molar specific heat for this process is (5Ry), where R is gas constant. Then the value of ‘y’ is ___ .

Let nr and nb be respectively the number of photons emitted by a red bulb and a blue bulb of equal power in one second.

The first and the second ionisation energies of magnesium are 7.646 eV and 15.035 eV respectively. The amount of energy in kJ needed to convert all the atoms of magnesium into Mg2+ ions present in 24 mg of magnesium vapour will be: (Given 1 eV=96.5 kJmol–1).

Iodine molecule dissociates into atoms after absorbing light of 4500 oA . If one quantum of radiation is absorbed by each molecule. Calculate the kinetic energy of iodine atoms (bond energy of I2=240 kJmol−1)

Calculate the lattice enthalpy in kJ mol−1of LiF given that Sublimation of lithium is 155.3 kJ mol−1 Dissociation of half mole of F2=75.3 kJ Ionization enthalpy of lithium =520 kJ mol−1 Electron gain enthalpy of 1 mol of F(g) =−333 kJΔfHoverall=−594 kJ mol−1

Electrons are emitted when a photosensitive surface illuminated by green light but electron emission does not take place by yellow light will the electrons be emitted when the surface is illuminated by a) red light b) blue light

The wavelength of the first line of the Balmer series of He+ ion is x times the last line . x is

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is

Out of the following carbocations, how many are more stable than the benzyl carbocation?

Name the products formed when ethane burns in air. Write the balanced chemical equation for the reaction showing the types of energies liberated.

Is there any formula to find the number of isomers for compound containing halogen , nitrogen and oxygen

The number of moles of electrons present in 3.0115×1024 particles of CO is:

The mole fraction of a solute in a solution of n-heptane is 0.25. The molality of the solution will be: [Report the answer upto two decimal place]

When Sn reacts with calculated amount of HgCl2 and excess HgCl2, then the product will be respectively.

Calculate the energy associated with photon of light having a wavelength 6000 oA. [h= 6.626×10−27 erg s]

Which one is electrophilic addition

What is Van Der Waal forces I cannot understand that. Andnd also what is the grafene

For the given reactions ,the name of the reaction which isn't correctly matched is :

Which of the following enhances the leathering property of soap? (a) Sodium carbonate (b) Sodium rosinate (c) Sodium stearate (d) Trisodium phosphate

Incorrect order in the following

Which of the following compound will answer lassaigne's test for nitrogen?

Which of the following is used as a catalyst in Haber's process?

The correct decreasing order of reactivity among the following is

If B–Cl bond has a dipole moment, explain why BCl3 molecule has zero dipole moment.

What are the three steps in the scientific method

The oxidation state of oxygen in superoxide is

Account for the following: (a) Aromatic carboxylic acids do not undergo Friedel-Crafts reaction. (b) pKa value of 4-nitrobenzoic acid is lower than that of benzoic acid.

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

What do you expect the nature of hydrides is, if formed by elements of atomic numbers 15, 19, 23 and 44 with dihydrogen? Compare their behaviour towards water.

An element crystallises in a structure having F.C.C unit cell of an edge 200 pm, 200 gm of it contains 24 ×1023 atoms. What is the density?

A gas occupies a volume of 2.5 L at 9×105Nm−2. Calculate the additional pressure required to decrease the volume of the gas to 1.51. Assume temperature is constant.

(a) Explain ‘Kohlrausch law of independent migration of ions’ with suitable examples (b) A solution of CuSO4 is electrolysed for 10 minutes with a current of 1.5 amperes. What is the mass of copper deposited at the cathode?