46295 + Interview Questions in Chemistry

1.	Which of the following statement(s) is/are true for diboarane?
Answer» Which of the following statement(s) is/are true for diboarane?

Discussion

2.	If all the terms of an equation has same units is it necessary that they have same dimension ? if all the terms in an equation have same dimensions is it necessary that they have same units?
Answer» If all the terms of an equation has same units is it necessary that they have same dimension ? if all the terms in an equation have same dimensions is it necessary that they have same units?

Discussion

3.	Write the mechanism of free radical polymerization of ethene.
Answer» Write the mechanism of free radical polymerization of ethene.

Discussion

4.	In the following which species does not contain sp3 hybridization
Answer» In the following which species does not contain $s p^{3}$ hybridization

Discussion

5.	Which reagent cannot be used to prepare an alkyl halide from an alcohol?
Answer» Which reagent cannot be used to prepare an alkyl halide from an alcohol?

Discussion

6.	The radius of second Bohr orbit, in terms of the Bohr radius,a0, in Li2+is:
Answer» The radius of second Bohr orbit, in terms of the Bohr radius, $a_{0}$ , in $L i^{2 +} i s :$

Discussion

7.	Why does benzene undergo electrophilic substitution reactions easily and nucleophilic substitutions with difficulty?
Answer» Why does benzene undergo electrophilic substitution reactions easily and nucleophilic substitutions with difficulty?

Discussion

8.	Write two basic requirements for refining of a metal by Mond's process and by van Arkel Method.
Answer» Write two basic requirements for refining of a metal by Mond's process and by van Arkel Method.

Discussion

9.	0.2 mole of HCl and 0.1 mole of CaCl2 were dissolved in water to have 500 ml of solution, the molarity of Cl- ions is (1)0.04 M (2)0.8 M (3)0.4 M (4)0.08 M
Answer» 0.2 mole of HCl and 0.1 mole of CaCl₂ were dissolved in water to have 500 ml of solution, the molarity of Cl^- ions is (1)0.04 M (2)0.8 M (3)0.4 M (4)0.08 M

9.

0.2 mole of HCl and 0.1 mole of CaCl2 were dissolved in water to have 500 ml of solution, the molarity of Cl- ions is (1)0.04 M (2)0.8 M (3)0.4 M (4)0.08 M

Answer»

0.2 mole of HCl and 0.1 mole of CaCl₂ were dissolved in water to have 500 ml of solution, the molarity of Cl^- ions is

(1)0.04 M (2)0.8 M (3)0.4 M (4)0.08 M

Discussion

10.	In the reaction PCl3+SO3→POCl3+SO2,PCl3 acts as __ agent.
Answer» In the reaction $P C l_{3} + S O_{3} \to P O C l_{3} + S O_{2}, P C l_{3}$ acts as __ agent.

Discussion

11.	In the following sequence of reactions: Toluenei) KMnO4/KOH,Δ−−−−−−−−−−−−→ii) H3O+ASOCl2−−−−→BH2/Pd−−−−→BaSO4C The product C is:
Answer» In the following sequence of reactions: $Toluene i) K M n O_{4} / K O H, Δ - ----------- \to i i) H_{3} O^{+} A S O C l_{2} - --- \to B H_{2} / P d - --- \to B a S O_{4} C$ The product C is:

Discussion

12.	When 1.0 mole of N2 and 3.0 moles of H2 was heated in a vessel at 773K and a pressure of 3.55 atm. 30% of N2 is converted into NH3 at equilibrium. Calculate KP for the reaction -
Answer» When 1.0 mole of $N_{2}$ and 3.0 moles of $H_{2}$ was heated in a vessel at 773K and a pressure of 3.55 atm. 30% of $N_{2}$ is converted into $N H_{3}$ at equilibrium. Calculate KP for the reaction -

Discussion

13.	The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water is Kf = 1.86 k kg mol-1)
Answer» The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water is K_f = 1.86 k kg mol^-1)

Discussion

14.	(a) Following reactions occur at cathode during the electrolysis of aqueous sodium chloride solution: Na+(aq)+e−→Na(s) E∘=−2.71V H+(aq)+e−→12H2(g)E∘=0.00V On the basis of their standard reduction electrode potential (E∘) values, which reaction is feasible at the cathode and why? (b) Why does the cell potential of mercury cell remain constant throughout its life?
Answer» (a) Following reactions occur at cathode during the electrolysis of aqueous sodium chloride solution: $N a^{+} (a q) + e^{-} \to N a (s) E^{\circ} = - 2.71 V$ $H^{+} (a q) + e^{-} \to \frac{1}{2} H_{2} (g) E^{\circ} = 0.00 V$ On the basis of their standard reduction electrode potential $(E^{\circ})$ values, which reaction is feasible at the cathode and why? (b) Why does the cell potential of mercury cell remain constant throughout its life?

14.

(a) Following reactions occur at cathode during the electrolysis of aqueous sodium chloride solution: Na+(aq)+e−→Na(s) E∘=−2.71V H+(aq)+e−→12H2(g)E∘=0.00V On the basis of their standard reduction electrode potential (E∘) values, which reaction is feasible at the cathode and why? (b) Why does the cell potential of mercury cell remain constant throughout its life?

Answer»

(a) Following reactions occur at cathode during the electrolysis of aqueous sodium chloride solution:

$N a^{+} (a q) + e^{-} \to N a (s) E^{\circ} = - 2.71 V$
$H^{+} (a q) + e^{-} \to \frac{1}{2} H_{2} (g) E^{\circ} = 0.00 V$

On the basis of their standard reduction electrode potential $(E^{\circ})$ values, which reaction is feasible at the cathode and why?

(b) Why does the cell potential of mercury cell remain constant throughout its life?

Discussion

15.	Which electrolyte will precipitate a negatively charged colloids (As2S3 sol ) to a greater extend?
Answer» Which electrolyte will precipitate a negatively charged colloids (As₂S₃sol ) to a greater extend?

Discussion

16.	1-Chlorobutane is treated with alcoholic KOH, the major product formed is
Answer» 1-Chlorobutane is treated with alcoholic KOH, the major product formed is

Discussion

17.	The work done when two moles of an ideal gas is compressed from a volume of 5 m3 to 1 dm3 at 300K,under a pressure of 100kPa?
Answer» The work done when two moles of an ideal gas is compressed from a volume of 5 m³ to 1 dm³ at 300K,under a pressure of 100kPa?

Discussion

18.	Which of the following molecule have only one pπ−dπ bond and zero pπ−pπ bonds?
Answer» Which of the following molecule have only one $p π - d π$ bond and zero $p π - p π$ bonds?

Discussion

19.	The momentum of a particle with de Broglie wavelength 2 ∘A is: (Planck's constant,h=6.62×10−34 Js)
Answer» The momentum of a particle with de Broglie wavelength $2 \circ A$ is: $(Planck's constant, h = 6.62 \times 10^{- 34} J s)$

Discussion

20.	Diagonal relationship is shown by certain elements of period.
Answer» Diagonal relationship is shown by certain elements of period.

Discussion

21.	The options with only amphoteric oxides are
Answer» The options with only amphoteric oxides are

Discussion

22.	The smelting of Zinc Oxide (obtained from roasted ZnS) happens __ the boiling point of Zinc metal
Answer» The smelting of Zinc Oxide (obtained from roasted ZnS) happens __ the boiling point of Zinc metal

Discussion

23.	975 mL of a water sample contains 1 mg CaCl2 and 1 mg MgCl2. Total hardness of water (in ppm) is
Answer» 975 $m L$ of a water sample contains 1 $m g C a C l_{2}$ and 1 $m g M g C l_{2}$ . Total hardness of water (in ppm) is

Discussion

24.	Major product in the given reaction is:
Answer» Major product in the given reaction is:

Discussion

25.	When hypophosphorous acid is treated with diazonium salts, it is reduced to:
Answer» When hypophosphorous acid is treated with diazonium salts, it is reduced to:

Discussion

26.	The common features among the species CN−,CO and NO+ are
Answer» The common features among the species $C N^{-}, C O a n d N O^{+}$ are

Discussion

27.	Arrange in decreasing order of basicity, H2O, OH−, CH3OH,CH3O−
Answer» Arrange in decreasing order of basicity, $H_{2} O, O H^{-}, C H_{3} O H, C H_{3} O^{-}$

Discussion

28.	Which of the following on hydrolysis forms acetic acid
Answer» Which of the following on hydrolysis forms acetic acid

Discussion

29.	A given mass of gas expands from state A to state B by three paths 1, 2 and 3 as shown in the figure below, If w1,w2 and w3 respectively, be the work done by the gas along three paths, then
Answer» A given mass of gas expands from state A to state B by three paths 1, 2 and 3 as shown in the figure below, If $w_{1}, w_{2}$ and $w_{3}$ respectively, be the work done by the gas along three paths, then

Discussion

30.	Match the four starting meterials (P, Q, R, S) given in List – I with the corresponding reaction schemes (I, II, III, IV) provided in List – II and select the correct answer using the code given below the lists.
Answer» Match the four starting meterials (P, Q, R, S) given in List – I with the corresponding reaction schemes (I, II, III, IV) provided in List – II and select the correct answer using the code given below the lists.

30.

Match the four starting meterials (P, Q, R, S) given in List – I with the corresponding reaction schemes (I, II, III, IV) provided in List – II and select the correct answer using the code given below the lists.

Answer»

Match the four starting meterials (P, Q, R, S) given in List – I with the corresponding reaction schemes
(I, II, III, IV) provided in List – II and select the correct answer using the code given below the lists.

Discussion

31.	What is Oxidation state of Fe inside and outside in Fe4[Fe(CN)6]
Answer» What is Oxidation state of Fe inside and outside in Fe4[Fe(CN)6]

Discussion

32.	The hybridization state of carbon in carbon dioxide is:
Answer» The hybridization state of carbon in carbon dioxide is:

Discussion

33.	Which of the following will have the least bond angle?
Answer» Which of the following will have the least bond angle?

Discussion

34.	Conversion of Ketoximes to N- substituted amides is known as Beckmann rearrangement. In this rearrangement, migration takes place from carbon to nitrogen. The reaction is catalyzed by acidic reagents. The main function of the acidic catalyst is to convert -OH of the oxime into a better leaving group by protonation.
Answer» Conversion of Ketoximes to N- substituted amides is known as Beckmann rearrangement. In this rearrangement, migration takes place from carbon to nitrogen. The reaction is catalyzed by acidic reagents. The main function of the acidic catalyst is to convert -OH of the oxime into a better leaving group by protonation.

34.

Conversion of Ketoximes to N- substituted amides is known as Beckmann rearrangement. In this rearrangement, migration takes place from carbon to nitrogen. The reaction is catalyzed by acidic reagents. The main function of the acidic catalyst is to convert -OH of the oxime into a better leaving group by protonation.

Answer»

Conversion of Ketoximes to N- substituted amides is known as Beckmann rearrangement. In this rearrangement, migration takes place from carbon to nitrogen. The reaction is catalyzed by acidic reagents. The main function of the acidic catalyst is to convert -OH of the oxime into a better leaving group by protonation.

Discussion

35.	The ligand N(CH2CH2NH2)3 is:
Answer» The ligand $N (C H_{2} C H_{2} N H_{2})_{3}$ is:

Discussion

36.	Match the followings an choose the correct combination from the options given: List - I List - II a. Photolysis of water 1. Zinc b. Diazotrophy 2. Copper c. Cytochrome c oxidase 3. Manganese d. Biosynthesis of IAA 4. Molybdenum 5. Boron
Answer» Match the followings an choose the correct combination from the options given: List - I List - II a. Photolysis of water 1. Zinc b. Diazotrophy 2. Copper c. Cytochrome c oxidase 3. Manganese d. Biosynthesis of IAA 4. Molybdenum 5. Boron

36.

Match the followings an choose the correct combination from the options given: List - I List - II a. Photolysis of water 1. Zinc b. Diazotrophy 2. Copper c. Cytochrome c oxidase 3. Manganese d. Biosynthesis of IAA 4. Molybdenum 5. Boron

Answer»

Match the followings an choose the correct combination from the options given:

List - I List - II

a. Photolysis of water 1. Zinc

b. Diazotrophy 2. Copper

c. Cytochrome c oxidase 3. Manganese

d. Biosynthesis of IAA 4. Molybdenum

5. Boron

Discussion

37.	Theory of relativity reveals that mass can be converted into energy. The energy E so obtained is proportional to certain powers of mass m and the speed c of light. Guess a realtion among the quantities using the method of dimensions.
Answer» Theory of relativity reveals that mass can be converted into energy. The energy E so obtained is proportional to certain powers of mass m and the speed c of light. Guess a realtion among the quantities using the method of dimensions.

Discussion

38.	In the reaction, CH3COCH3(g)⇌CH3CH3 (g)+CO(g) The initial pressure of CH3CO CH3 (g) is 150 mm Hg and at equilibrium the mole fraction of CO is 13 then the value of Kp is:
Answer» In the reaction, $C H_{3} C O C H_{3_{(} g)} ⇌ C H_{3} C H_{3 (g)} + C O_{(g)}$ The initial pressure of $C H_{3} C O$ $C H_{3 (g)}$ is $150 m m H g$ and at equilibrium the mole fraction of $C O$ is $\frac{1}{3}$ then the value of $K_{p}$ is:

Discussion

39.	Electronic configuration In case of 4s and 3d which would be written first?
Answer» Electronic configuration In case of 4s and 3d which would be written first?

Discussion

40.	Henry’s law constant for the solubility of nitrogen gas in water at 298 K is 1.0×10−5atm. The mole fraction of nitrogen in air is 0.8. The number of moles of nitrogen from air dissolved in 10 mol of water at 298 K and 5 atm pressure is
Answer» Henry’s law constant for the solubility of nitrogen gas in water at 298 K is $1.0 \times 10^{- 5} a t m$ . The mole fraction of nitrogen in air is 0.8. The number of moles of nitrogen from air dissolved in 10 mol of water at 298 K and 5 atm pressure is

Discussion

41.	The largest distance between the inter atomic planes of a crystal is 10−7cm. The upper limit for the wavelength of X-rays which can be usefully studied with this crystal is
Answer» The largest distance between the inter atomic planes of a crystal is $10^{- 7} c m$ . The upper limit for the wavelength of X-rays which can be usefully studied with this crystal is

Discussion

42.	Why is the reaction Cu2O + .5Cu2S -> 2Cu + .5SO2 called an autoreduction reaction?
Answer» Why is the reaction Cu2O + .5Cu2S -> 2Cu + .5SO2 called an autoreduction reaction?

Discussion

43.	The correct statement about the compounds A, B and C is
Answer» The correct statement about the compounds A, B and C is

Discussion

44.	Calculate the degree of dissociation of HI as 2HI⇌H2+I2 at 450 oC , if the equilibrium constant for the dissociation reaction is 0.263.
Answer» Calculate the degree of dissociation of $H I$ as $2 H I ⇌ H_{2} + I_{2}$ at $450^{o} C$ , if the equilibrium constant for the dissociation reaction is 0.263.

Discussion

45.	End product of the following reaction is : CH3COOHCaCO3−−−−→AΔ−→BNH2OH−−−−−→C
Answer» End product of the following reaction is : $C H_{3} C O O H C a C O_{3} - --- \to A Δ - \to B N H_{2} O H - ---- \to C$

Discussion

46.	Consider the following statements S1 : Generally square planar complexes show geometrical isomerism but do not exhibit optical isomerism because they do not possess plane of symmetry S2:Δt=49Δo S3 : In octahedral complexes each electron entering the t2g orbtials stabilizes the complex ion by 0.4 Δo and each electron entering the eg orbital destabilizes the complex by an amount of 0.6 Δo
Answer» Consider the following statements $S_{1}$ : Generally square planar complexes show geometrical isomerism but do not exhibit optical isomerism because they do not possess plane of symmetry $S_{2} : Δ_{t} = \frac{4}{9} Δ_{o}$ $S_{3}$ : In octahedral complexes each electron entering the $t_{2 g}$ orbtials stabilizes the complex ion by $0.4 Δ_{o}$ and each electron entering the $e_{g}$ orbital destabilizes the complex by an amount of $0.6 Δ_{o}$

46.

Consider the following statements S1 : Generally square planar complexes show geometrical isomerism but do not exhibit optical isomerism because they do not possess plane of symmetry S2:Δt=49Δo S3 : In octahedral complexes each electron entering the t2g orbtials stabilizes the complex ion by 0.4 Δo and each electron entering the eg orbital destabilizes the complex by an amount of 0.6 Δo

Answer»

Consider the following statements

$S_{1}$ : Generally square planar complexes show geometrical isomerism but do not exhibit optical isomerism because they do not possess plane of symmetry

$S_{2} : Δ_{t} = \frac{4}{9} Δ_{o}$

$S_{3}$ : In octahedral complexes each electron entering the $t_{2 g}$ orbtials stabilizes the complex ion by $0.4 Δ_{o}$ and each electron entering the $e_{g}$ orbital destabilizes the complex by an amount of $0.6 Δ_{o}$

Discussion

47.	In CCP arrangement of A and B atoms, A atoms are at the corners of unit cell, while B atoms are at the face centre. In each unit cell two atoms are missing from the two corners. The simplest formula of the compound is
Answer» In CCP arrangement of A and B atoms, A atoms are at the corners of unit cell, while B atoms are at the face centre. In each unit cell two atoms are missing from the two corners. The simplest formula of the compound is

Discussion

48.	2.56 g of sulphur in 100 g of carbon disulphide has a depression in freezing point of 0.010ºC. If Kf = 0.1 KKg/mol, atomicity of sulphur is:
Answer» 2.56 g of sulphur in 100 g of carbon disulphide has a depression in freezing point of 0.010ºC. If Kf = 0.1 KKg/mol, atomicity of sulphur is:

Discussion

49.	Phenol is less acidic than . . . . (a) ethanol (b) o - nitrophenol (c) o-methylphenol (d) o - methoxyphenol
Answer» Phenol is less acidic than . . . . (a) ethanol (b) o - nitrophenol (c) o-methylphenol (d) o - methoxyphenol

Discussion

50.	A 3 g sample of haematite (iron ore containing Fe2O3) is dissolved in hydrochloric acid and the volume is made up to 250 mL. 25 mL of this solution was reduced with SnCl2. Unreacted SnCl2 was removed by extraction, and the residual solution needed 30 mL of 0.02 M acidified K2Cr2O7 solution to reach equivalence point. Determine the mass percentage of Fe2O3 in the ore.
Answer» A 3 g sample of haematite (iron ore containing $F e_{2} O_{3}$ ) is dissolved in hydrochloric acid and the volume is made up to 250 mL. 25 mL of this solution was reduced with $S n C l_{2}$ . Unreacted $S n C l_{2}$ was removed by extraction, and the residual solution needed 30 mL of 0.02 M acidified $K_{2} C r_{2} O_{7}$ solution to reach equivalence point. Determine the mass percentage of $F e_{2} O_{3}$ in the ore.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which of the following statement(s) is/are true for diboarane?

If all the terms of an equation has same units is it necessary that they have same dimension ? if all the terms in an equation have same dimensions is it necessary that they have same units?

Write the mechanism of free radical polymerization of ethene.

In the following which species does not contain sp3 hybridization

Which reagent cannot be used to prepare an alkyl halide from an alcohol?

The radius of second Bohr orbit, in terms of the Bohr radius,a0, in Li2+is:

Why does benzene undergo electrophilic substitution reactions easily and nucleophilic substitutions with difficulty?

Write two basic requirements for refining of a metal by Mond's process and by van Arkel Method.

0.2 mole of HCl and 0.1 mole of CaCl2 were dissolved in water to have 500 ml of solution, the molarity of Cl- ions is (1)0.04 M (2)0.8 M (3)0.4 M (4)0.08 M

In the reaction PCl3+SO3→POCl3+SO2,PCl3 acts as __ agent.

In the following sequence of reactions: Toluenei) KMnO4/KOH,Δ−−−−−−−−−−−−→ii) H3O+ASOCl2−−−−→BH2/Pd−−−−→BaSO4C The product C is:

When 1.0 mole of N2 and 3.0 moles of H2 was heated in a vessel at 773K and a pressure of 3.55 atm. 30% of N2 is converted into NH3 at equilibrium. Calculate KP for the reaction -

The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water is Kf = 1.86 k kg mol-1)

Which electrolyte will precipitate a negatively charged colloids (As2S3 sol ) to a greater extend?

1-Chlorobutane is treated with alcoholic KOH, the major product formed is

The work done when two moles of an ideal gas is compressed from a volume of 5 m3 to 1 dm3 at 300K,under a pressure of 100kPa?

Which of the following molecule have only one pπ−dπ bond and zero pπ−pπ bonds?

The momentum of a particle with de Broglie wavelength 2 ∘A is: (Planck's constant,h=6.62×10−34 Js)

Diagonal relationship is shown by certain elements of period.

The options with only amphoteric oxides are

The smelting of Zinc Oxide (obtained from roasted ZnS) happens __ the boiling point of Zinc metal

975 mL of a water sample contains 1 mg CaCl2 and 1 mg MgCl2. Total hardness of water (in ppm) is

Major product in the given reaction is:

When hypophosphorous acid is treated with diazonium salts, it is reduced to:

The common features among the species CN−,CO and NO+ are

Arrange in decreasing order of basicity, H2O, OH−, CH3OH,CH3O−

Which of the following on hydrolysis forms acetic acid

A given mass of gas expands from state A to state B by three paths 1, 2 and 3 as shown in the figure below, If w1,w2 and w3 respectively, be the work done by the gas along three paths, then

Match the four starting meterials (P, Q, R, S) given in List – I with the corresponding reaction schemes (I, II, III, IV) provided in List – II and select the correct answer using the code given below the lists.

What is Oxidation state of Fe inside and outside in Fe4[Fe(CN)6]

The hybridization state of carbon in carbon dioxide is:

Which of the following will have the least bond angle?

The ligand N(CH2CH2NH2)3 is:

Match the followings an choose the correct combination from the options given: List - I List - II a. Photolysis of water 1. Zinc b. Diazotrophy 2. Copper c. Cytochrome c oxidase 3. Manganese d. Biosynthesis of IAA 4. Molybdenum 5. Boron

Theory of relativity reveals that mass can be converted into energy. The energy E so obtained is proportional to certain powers of mass m and the speed c of light. Guess a realtion among the quantities using the method of dimensions.

In the reaction, CH3COCH3(g)⇌CH3CH3 (g)+CO(g) The initial pressure of CH3CO CH3 (g) is 150 mm Hg and at equilibrium the mole fraction of CO is 13 then the value of Kp is:

Electronic configuration In case of 4s and 3d which would be written first?

Henry’s law constant for the solubility of nitrogen gas in water at 298 K is 1.0×10−5atm. The mole fraction of nitrogen in air is 0.8. The number of moles of nitrogen from air dissolved in 10 mol of water at 298 K and 5 atm pressure is

The largest distance between the inter atomic planes of a crystal is 10−7cm. The upper limit for the wavelength of X-rays which can be usefully studied with this crystal is

Why is the reaction Cu2O + .5Cu2S -> 2Cu + .5SO2 called an autoreduction reaction?

The correct statement about the compounds A, B and C is

Calculate the degree of dissociation of HI as 2HI⇌H2+I2 at 450 oC , if the equilibrium constant for the dissociation reaction is 0.263.

End product of the following reaction is : CH3COOHCaCO3−−−−→AΔ−→BNH2OH−−−−−→C

In CCP arrangement of A and B atoms, A atoms are at the corners of unit cell, while B atoms are at the face centre. In each unit cell two atoms are missing from the two corners. The simplest formula of the compound is

2.56 g of sulphur in 100 g of carbon disulphide has a depression in freezing point of 0.010ºC. If Kf = 0.1 KKg/mol, atomicity of sulphur is:

Phenol is less acidic than . . . . (a) ethanol (b) o - nitrophenol (c) o-methylphenol (d) o - methoxyphenol