46295 + Interview Questions in Chemistry

1.	Enthalpy of solution of NaOH (solid ) in water is −41.6 kJ mol−1 . When NaOH is dissolved in water, the temperature of water
Answer» Enthalpy of solution of $N a O H$ (solid ) in water is $- 41.6 k J m o l^{- 1}$ . When $N a O H$ is dissolved in water, the temperature of water

Discussion

2.	Conformational isomerism is observed in
Answer» Conformational isomerism is observed in

Discussion

3.	Write balanced net ionic equation for the following reaction in basic solution: Mn(OH)2(s)+MnO−4(aq)→MnO2(s)
Answer» Write balanced net ionic equation for the following reaction in basic solution: $M n (O H)_{2} (s) + M n O_{4}^{-} (a q) \to M n O_{2} (s)$

Discussion

4.	Artificial synthesis of DNA was done by
Answer» Artificial synthesis of DNA was done by

Discussion

5.	All of the following decompose easily on heating and gives O2 except:
Answer» All of the following decompose easily on heating and gives O₂except:

Discussion

6.	Which of the following amine gives diazonium salt on reaction with HNO2?
Answer» Which of the following amine gives diazonium salt on reaction with HNO₂?

Discussion

7.	The sodium salt of methyl orange has 7% sodium. What is the minimum molecular weight of the compound?
Answer» The sodium salt of methyl orange has 7% sodium. What is the minimum molecular weight of the compound?

Discussion

8.	What is the 'D' in the following reaction
Answer» What is the 'D' in the following reaction

Discussion

9.	In H.C.P. arrangement in three dimensions, the overall coordination number of each sphere is
Answer» In H.C.P. arrangement in three dimensions, the overall coordination number of each sphere is

Discussion

10.	The geometry and the number of unpaired electron(s) of [MnBr4]2− , respectively, are
Answer» The geometry and the number of unpaired electron(s) of $[M n B r_{4}]^{2 -}$ , respectively, are

Discussion

11.	Question 50 Match the terms given in Column I with expressions given in Column II. Column I Column IIA. Mass percentage1. Number of moles of the solute xomponentVolume of solution in litresB. Volume percentage2. Number of moles of a componentTotal number of moles of all the componentsC. Mole fraction3. Volume of the solute component in solutionTotal volume of solution×100D. Molality4. Mass of the solute component in solutionTotal mass of the solution×100E. Molarity5. Number of moles of the solute componentsMass of solvent in kilograms
Answer» Question 50 Match the terms given in Column I with expressions given in Column II. $Column I Column IIA. Mass percentage1. Number of moles of the solute xomponentVolume of solution in litresB. Volume percentage2. Number of moles of a componentTotal number of moles of all the componentsC. Mole fraction3. Volume of the solute component in solutionTotal volume of solution×100D. Molality4. Mass of the solute component in solutionTotal mass of the solution×100E. Molarity5. Number of moles of the solute componentsMass of solvent in kilograms$

Discussion

12.	A solid has a structure in which 'W' atoms are located at the corners of a cubic lattice 'O' atoms at the centre of edges and 'Na' atoms at the centre of the cube. The formula for the compound is [KCET 1996]
Answer» A solid has a structure in which 'W' atoms are located at the corners of a cubic lattice 'O' atoms at the centre of edges and 'Na' atoms at the centre of the cube. The formula for the compound is [KCET 1996]

12.

A solid has a structure in which 'W' atoms are located at the corners of a cubic lattice 'O' atoms at the centre of edges and 'Na' atoms at the centre of the cube. The formula for the compound is [KCET 1996]

Answer»

A solid has a structure in which 'W' atoms are located at the corners of a cubic lattice 'O' atoms at the centre of edges and 'Na' atoms at the centre of the cube. The formula for the compound is

[KCET 1996]

Discussion

13.	Benzyl alcohol is obtained from benzaldehyde by [CPMT 1983; MNR 1993]
Answer» Benzyl alcohol is obtained from benzaldehyde by [CPMT 1983; MNR 1993]

Discussion

14.	According to Raoult's law the partial vapour pressure of each component in the solution is directly proportional to its
Answer» According to Raoult's law the partial vapour pressure of each component in the solution is directly proportional to its

Discussion

15.	DNA contains nucleobases, sugar and phosphate. Removal of which among these from a DNA sample will not significantly affect the length of DNA?
Answer» DNA contains nucleobases, sugar and phosphate. Removal of which among these from a DNA sample will not significantly affect the length of DNA?

Discussion

16.	Which of the following expression correctly represents the equivalent conductivity at infinite dilution of Al2(SO4)3? Given that λ∘Al3+ and λ∘SO2−4 are the equivalent conductivities at infinite dilution of the respective ions.
Answer» Which of the following expression correctly represents the equivalent conductivity at infinite dilution of $A l_{2} (S O_{4})_{3}$ ? Given that $λ_{A l^{3 +}}^{\circ}$ and $λ_{S O_{4}^{2 -}}^{\circ}$ are the equivalent conductivities at infinite dilution of the respective ions.

16.

Which of the following expression correctly represents the equivalent conductivity at infinite dilution of Al2(SO4)3? Given that λ∘Al3+ and λ∘SO2−4 are the equivalent conductivities at infinite dilution of the respective ions.

Answer»

Which of the following expression correctly represents the equivalent conductivity at infinite dilution of $A l_{2} (S O_{4})_{3}$ ?

Given that $λ_{A l^{3 +}}^{\circ}$ and $λ_{S O_{4}^{2 -}}^{\circ}$ are the equivalent conductivities at infinite dilution of the respective ions.

Discussion

17.	The molecule having dipole moment is
Answer» The molecule having dipole moment is

Discussion

18.	The optical rotation for the α-form of a carbohydrate is +107.6o, that of the β-form is +52.8o. The solution at equilibrium of these anomers has an optical rotaion of +80.2o. The value of the αβ is:
Answer» The optical rotation for the $α$ -form of a carbohydrate is $+ {107.6}^{o}$ , that of the $β$ -form is $+ {52.8}^{o}$ . The solution at equilibrium of these anomers has an optical rotaion of $+ {80.2}^{o}$ . The value of the $\frac{α}{β}$ is:

Discussion

19.	Predict the molecular shape of the OF2 molecule.
Answer» Predict the molecular shape of the OF₂ molecule.

Discussion

20.	The temperature below which a gas should be cooled, before it can be liquified by pressure only is termed as
Answer» The temperature below which a gas should be cooled, before it can be liquified by pressure only is termed as

20.

The temperature below which a gas should be cooled, before it can be liquified by pressure only is termed as

Answer»

The temperature below which a gas should be cooled, before it can be liquified by pressure only is termed as

Discussion

21.	A→B zero order reaction C→D first order reaction If the first order reaction gets 75% completed in 40 minutes and zero order reaction gets 75% completed in 30 minutes then calculate the value of Z, where Z is ratio of half life of first order and zero order reaction
Answer» $A \to B z e r o o r d e r r e a c t i o n$ $C \to D f i r s t o r d e r r e a c t i o n$ If the first order reaction gets 75% completed in 40 minutes and zero order reaction gets 75% completed in 30 minutes then calculate the value of Z, where Z is ratio of half life of first order and zero order reaction

Discussion

22.	Which of the following can be a correct value of Van't Hoff factor i if the solute undergoes dissociation?
Answer» Which of the following can be a correct value of Van't Hoff factor i if the solute undergoes dissociation?

Discussion

23.	Freshly precipitated aluminium and magnesium hydroxides are stirred vigorously in a buffer solution containing 0.05 mol L−1 of NH4OH and 0.25 mol L−1 of NH4Cl. Calculate the concentration of magnesium ions in solution. Ksp Al(OH)3=6×10−32 Kb NH4OH=1.8×10−5 Ksp Mg(OH)2=6×10−10
Answer» Freshly precipitated aluminium and magnesium hydroxides are stirred vigorously in a buffer solution containing $0.05 {mol L}^{- 1}$ of $N H_{4} O H$ and $0.25 {mol L}^{- 1}$ of $N H_{4} C l$ . Calculate the concentration of magnesium ions in solution. $K_{s p} A l (O H)_{3} = 6 \times 10^{- 32}$ $K_{b} N H_{4} O H = 1.8 \times 10^{- 5}$ $K_{s p} M g (O H)_{2} = 6 \times 10^{- 10}$

Discussion

24.	For the redox reaction MnO−4+C2O−24+H+→Mn2++CO2+H2O the correct coefficients of the reactants for the balanced reaction are
Answer» For the redox reaction $M n O_{4}^{-} + C_{2} O_{4}^{- 2} + H^{+} \to M n^{2 +} + C O_{2} + H_{2} O$ the correct coefficients of the reactants for the balanced reaction are

Discussion

25.	What is the ratio of time period in the second orbit of hydrogen atom to the third orbit of He+ ion?
Answer» What is the ratio of time period in the second orbit of hydrogen atom to the third orbit of $H e^{+}$ ion?

Discussion

26.	P is the probability of finding a 1s electron of hydrogen atom in a spherical shell of infinitesimal thickness, dr, at a distance r from the nucleus. The volume of this shell is 4πr2dr. The qualitative sketch of the dependence of P on r is
Answer» P is the probability of finding a 1s electron of hydrogen atom in a spherical shell of infinitesimal thickness, dr, at a distance r from the nucleus. The volume of this shell is $4 π r^{2} d r$ . The qualitative sketch of the dependence of P on r is

Discussion

27.	A filter paper soaked in salt X turns brown when exposed to HNO3 vapor. The salt X is
Answer» A filter paper soaked in salt X turns brown when exposed to $H N O_{3}$ vapor. The salt X is

Discussion

28.	The standard reduction potential at 298 K for the following half cell reaction Zn2+(aq)+2e→Zn(s)E∘=−0.762 V Cr3+(aq)+3e→Cr(s)E∘=0.740 V 2H+(aq)+2e→H2(g)E∘=0.0 V F2(g)+2e→2F−(aq)E∘=2.87 V Which of the following is the strongest reducing agent?
Answer» The standard reduction potential at 298 K for the following half cell reaction $Z n_{(a q)}^{2 +} + 2 e \to Z n_{(s)} E^{\circ} = - 0.762 V$ $C r_{(a q)}^{3 +} + 3 e \to C r_{(s)} E^{\circ} = 0.740 V$ $2 H_{(a q)}^{+} + 2 e \to H_{2 (g)} E^{\circ} = 0.0 V$ $F_{2 (g)} + 2 e \to 2 F_{(a q)}^{-} E^{\circ} = 2.87 V$ Which of the following is the strongest reducing agent?

Discussion

29.	For a 3s− orbital: ψ(3s)=1a√3(1a0)32(6−6σ+σ2)e−σ2 Where σ=2rZ3a0 What is the maximum radial distance of node from nucleus?
Answer» For a $3 s -$ orbital: $ψ (3 s) = \frac{1}{a \sqrt{3}} (\frac{1}{a_{0}})^{\frac{3}{2}} (6 - 6 σ + σ^{2}) e^{\frac{- σ}{2}}$ Where $σ = \frac{2 r Z}{3 a_{0}}$ What is the maximum radial distance of node from nucleus?

Discussion

30.	The solubility of a sparingly soluble salt AxBy in water at 250C=1.4×10−4M. The solubility product is 1.1×10−11. Select the correct possible option(s):
Answer» The solubility of a sparingly soluble salt $A_{x} B_{y}$ in water at $25^{0} C = 1.4 \times 10^{- 4} M$ . The solubility product is $1.1 \times 10^{- 11}$ . Select the correct possible option(s):

Discussion

31.	Which of the following observations match with Thomson's plum-pudding model of the atom?
Answer» Which of the following observations match with Thomson's plum-pudding model of the atom?

Discussion

32.	The most stable oxy acid of chlorine is
Answer» The most stable oxy acid of chlorine is

Discussion

33.	A+SOCl2→B+SO2+HClX+Na→C+H2B+C→(C2H5)2O+NaCl Then A and X are respectively
Answer» $A + S O C l_{2} \to B + S O_{2} + H C l X + N a \to C + H_{2} B + C \to (C_{2} H_{5})_{2} O + N a C l$ Then A and X are respectively

33.

A+SOCl2→B+SO2+HClX+Na→C+H2B+C→(C2H5)2O+NaCl Then A and X are respectively

Answer»

$A + S O C l_{2} \to B + S O_{2} + H C l X + N a \to C + H_{2} B + C \to (C_{2} H_{5})_{2} O + N a C l$

Then A and X are respectively

Discussion

34.	The work function for caesium atom is 1.9 eV. Calculate (a) the threshold wavelength and (b) the threshold frequency of the radiation. If the caesium element is irradiated with a wavelength 500 nm, calculate the kinetic energy and the velocity of the ejected photoelectron.
Answer» The work function for caesium atom is 1.9 eV. Calculate (a) the threshold wavelength and (b) the threshold frequency of the radiation. If the caesium element is irradiated with a wavelength 500 nm, calculate the kinetic energy and the velocity of the ejected photoelectron.

Discussion

35.	The anhydride of HClO4 is
Answer» The anhydride of $H C l O_{4}$ is

Discussion

36.	The compounds contaning sp hybridized carbon atom are:
Answer» The compounds contaning sp hybridized carbon atom are:

Discussion

37.	If an atom has electronic configuration 1s22s22p63s23p63d104s2 it will be placed in?
Answer» If an atom has electronic configuration $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2}$ it will be placed in?

Discussion

38.	Which of the following is not the correct increasing order of ionisation energy
Answer» Which of the following is not the correct increasing order of ionisation energy

38.

Which of the following is not the correct increasing order of ionisation energy

Answer»

Which of the following is not the correct increasing order of ionisation energy

Discussion

39.	Which of the following statements are not correct?
Answer» Which of the following statements are not correct?

Discussion

40.	A hydrogen electrode placed in a buffer solution of CH3COONa and CH3COOH in the molar ratios x : y and y : x has oxidation potentials E1 and E2 volts respectively at 298 K,(pH2=1atm). The pKa a value of acetic acid will be given by
Answer» A hydrogen electrode placed in a buffer solution of $C H_{3} C O O N a$ and $C H_{3} C O O H$ in the molar ratios x : y and y : x has oxidation potentials $E_{1}$ and $E_{2}$ volts respectively at 298 $K, (p_{H_{2}} = 1 a t m)$ . The $p K_{a}$ a value of acetic acid will be given by

Discussion

41.	Aqueous solution of the following compound on electrolysis gives ethane
Answer» Aqueous solution of the following compound on electrolysis gives ethane

Discussion

42.	We can find _____ rational number(s) between any two rational numbers.
Answer» We can find _____ rational number(s) between any two rational numbers.

Discussion

43.	Identify the correct order of acidic strengths of CO2,CuO,CaO and H2O
Answer» Identify the correct order of acidic strengths of $C O_{2}, C u O, C a O$ and $H_{2} O$

Discussion

44.	Arrange the following compounds in the order of decreasing tendency towards SN2 reaction. CH3CH2CH2Cl . . . . . . . . . (i) CH3CH2CHClCH3 . . . . . . .(ii) (CH3)2CHCH2Cl . . . . . . . .(iii) (CH3)3C−Cl . . . . . . . . . . (iv)
Answer» Arrange the following compounds in the order of decreasing tendency towards $S N_{2}$ reaction. $C H_{3} C H_{2} C H_{2} C l . . . . . . . . . (i)$ $C H_{3} C H_{2} C H C l C H_{3} . . . . . . . (i i)$ $(C H_{3})_{2} C H C H_{2} C l . . . . . . . . (i i i)$ $(C H_{3})_{3} C - C l . . . . . . . . . . (i v)$

Discussion

45.	Which of the following is γ- elimination?
Answer» Which of the following is $γ$ - elimination?

Discussion

46.	The IUPAC name of the compound
Answer» The IUPAC name of the compound

46.

The IUPAC name of the compound

Answer»

The IUPAC name of the compound

Discussion

47.	Write the formula of the compound of phosphorus which is obtained when conc.HNO3 oxidises P4.
Answer» Write the formula of the compound of phosphorus which is obtained when $c o n c . H N O_{3}$ oxidises $P_{4}$ .

Discussion

48.	In an aqueous solution of barium nitrate, the [NO−3] is 0.080 M. This solution can be labeled as
Answer» In an aqueous solution of barium nitrate, the $[N O_{3}^{-}]$ is 0.080 M. This solution can be labeled as

Discussion

49.	The number of electrons carrying a total charge equivalent to one K+ ion is equal to
Answer» The number of electrons carrying a total charge equivalent to one K+ ion is equal to

Discussion

50.	The magnetic flux linked with a coil is changed from 1 Wb to 0.1 Wb in 0.1 second. The induced emf is
Answer» The magnetic flux linked with a coil is changed from 1 Wb to 0.1 Wb in 0.1 second. The induced emf is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Enthalpy of solution of NaOH (solid ) in water is −41.6 kJ mol−1 . When NaOH is dissolved in water, the temperature of water

Conformational isomerism is observed in

Write balanced net ionic equation for the following reaction in basic solution: Mn(OH)2(s)+MnO−4(aq)→MnO2(s)

Artificial synthesis of DNA was done by

All of the following decompose easily on heating and gives O2 except:

Which of the following amine gives diazonium salt on reaction with HNO2?

The sodium salt of methyl orange has 7% sodium. What is the minimum molecular weight of the compound?

What is the 'D' in the following reaction

In H.C.P. arrangement in three dimensions, the overall coordination number of each sphere is

The geometry and the number of unpaired electron(s) of [MnBr4]2− , respectively, are

A solid has a structure in which 'W' atoms are located at the corners of a cubic lattice 'O' atoms at the centre of edges and 'Na' atoms at the centre of the cube. The formula for the compound is [KCET 1996]

Benzyl alcohol is obtained from benzaldehyde by [CPMT 1983; MNR 1993]

According to Raoult's law the partial vapour pressure of each component in the solution is directly proportional to its

DNA contains nucleobases, sugar and phosphate. Removal of which among these from a DNA sample will not significantly affect the length of DNA?

Which of the following expression correctly represents the equivalent conductivity at infinite dilution of Al2(SO4)3? Given that λ∘Al3+ and λ∘SO2−4 are the equivalent conductivities at infinite dilution of the respective ions.

The molecule having dipole moment is

The optical rotation for the α-form of a carbohydrate is +107.6o, that of the β-form is +52.8o. The solution at equilibrium of these anomers has an optical rotaion of +80.2o. The value of the αβ is:

Predict the molecular shape of the OF2 molecule.

The temperature below which a gas should be cooled, before it can be liquified by pressure only is termed as

A→B zero order reaction C→D first order reaction If the first order reaction gets 75% completed in 40 minutes and zero order reaction gets 75% completed in 30 minutes then calculate the value of Z, where Z is ratio of half life of first order and zero order reaction

Which of the following can be a correct value of Van't Hoff factor i if the solute undergoes dissociation?

Freshly precipitated aluminium and magnesium hydroxides are stirred vigorously in a buffer solution containing 0.05 mol L−1 of NH4OH and 0.25 mol L−1 of NH4Cl. Calculate the concentration of magnesium ions in solution. Ksp Al(OH)3=6×10−32 Kb NH4OH=1.8×10−5 Ksp Mg(OH)2=6×10−10

For the redox reaction MnO−4+C2O−24+H+→Mn2++CO2+H2O the correct coefficients of the reactants for the balanced reaction are

What is the ratio of time period in the second orbit of hydrogen atom to the third orbit of He+ ion?

P is the probability of finding a 1s electron of hydrogen atom in a spherical shell of infinitesimal thickness, dr, at a distance r from the nucleus. The volume of this shell is 4πr2dr. The qualitative sketch of the dependence of P on r is

A filter paper soaked in salt X turns brown when exposed to HNO3 vapor. The salt X is

The standard reduction potential at 298 K for the following half cell reaction Zn2+(aq)+2e→Zn(s)E∘=−0.762 V Cr3+(aq)+3e→Cr(s)E∘=0.740 V 2H+(aq)+2e→H2(g)E∘=0.0 V F2(g)+2e→2F−(aq)E∘=2.87 V Which of the following is the strongest reducing agent?

For a 3s− orbital: ψ(3s)=1a√3(1a0)32(6−6σ+σ2)e−σ2 Where σ=2rZ3a0 What is the maximum radial distance of node from nucleus?

The solubility of a sparingly soluble salt AxBy in water at 250C=1.4×10−4M. The solubility product is 1.1×10−11. Select the correct possible option(s):

Which of the following observations match with Thomson's plum-pudding model of the atom?

The most stable oxy acid of chlorine is

A+SOCl2→B+SO2+HClX+Na→C+H2B+C→(C2H5)2O+NaCl Then A and X are respectively

The work function for caesium atom is 1.9 eV. Calculate (a) the threshold wavelength and (b) the threshold frequency of the radiation. If the caesium element is irradiated with a wavelength 500 nm, calculate the kinetic energy and the velocity of the ejected photoelectron.

The anhydride of HClO4 is

The compounds contaning sp hybridized carbon atom are:

If an atom has electronic configuration 1s22s22p63s23p63d104s2 it will be placed in?

Which of the following is not the correct increasing order of ionisation energy

Which of the following statements are not correct?

A hydrogen electrode placed in a buffer solution of CH3COONa and CH3COOH in the molar ratios x : y and y : x has oxidation potentials E1 and E2 volts respectively at 298 K,(pH2=1atm). The pKa a value of acetic acid will be given by

Aqueous solution of the following compound on electrolysis gives ethane

We can find _____ rational number(s) between any two rational numbers.

Identify the correct order of acidic strengths of CO2,CuO,CaO and H2O

Arrange the following compounds in the order of decreasing tendency towards SN2 reaction. CH3CH2CH2Cl . . . . . . . . . (i) CH3CH2CHClCH3 . . . . . . .(ii) (CH3)2CHCH2Cl . . . . . . . .(iii) (CH3)3C−Cl . . . . . . . . . . (iv)

Which of the following is γ- elimination?

The IUPAC name of the compound

Write the formula of the compound of phosphorus which is obtained when conc.HNO3 oxidises P4.

In an aqueous solution of barium nitrate, the [NO−3] is 0.080 M. This solution can be labeled as

The number of electrons carrying a total charge equivalent to one K+ ion is equal to

The magnetic flux linked with a coil is changed from 1 Wb to 0.1 Wb in 0.1 second. The induced emf is