46295 + Interview Questions in Chemistry

1.	Calculate the mass of KBr (in g) that needs to be added to 1 litre of a 0.05 M solution of AgNO3 so that the precipitation of AgBr just starts. Solubility product (Ksp) of AgBr is 3.5×10−13. Take molecular mass of KBr to be 119 g mol−1
Answer» Calculate the mass of $K B r$ (in g) that needs to be added to 1 litre of a $0.05 M$ solution of $A g N O_{3}$ so that the precipitation of $A g B r$ just starts. Solubility product $(K_{s p})$ of $A g B r$ is $3.5 \times 10^{- 13}$ . Take molecular mass of $K B r$ to be $119 g m o l^{- 1}$

Discussion

2.	Give scientific explanationa. Bleaching powder has the odour of chlorine.b. The hard water of a well becomes soft on adding washing soda to it.c. Soap forms a precipitate in hard water.d. The particles of powder are given an electric charge while spraying them to form the powder coating.e. The aluminium article is used as an anode in the anodising process.f. When the radiation coming out from certain radioactive substance is passed through an electric field, marks are found at three places on the photographic plate placed in its path.g A certain type of ceramic tiles are fixed on the outer layer of a space shuttle.
Answer» Give scientific explanation a. Bleaching powder has the odour of chlorine. b. The hard water of a well becomes soft on adding washing soda to it. c. Soap forms a precipitate in hard water. d. The particles of powder are given an electric charge while spraying them to form the powder coating. e. The aluminium article is used as an anode in the anodising process. f. When the radiation coming out from certain radioactive substance is passed through an electric field, marks are found at three places on the photographic plate placed in its path. g A certain type of ceramic tiles are fixed on the outer layer of a space shuttle.

Discussion

3.	31. How to find a reaction whether it is a nucleophilic or electrophilic reaction ?
Answer» 31. How to find a reaction whether it is a nucleophilic or electrophilic reaction ?

Discussion

4.	10. Number of electrons in 1) p orbitals 2) px orbital 3)dx2-y2 orbital With explination.
Answer» 10. Number of electrons in 1) p orbitals 2) px orbital 3)dx2-y2 orbital With explination.

Discussion

5.	The general formula of silicate ion present in cyclic silicates is:
Answer» The general formula of silicate ion present in cyclic silicates is:

Discussion

6.	When Cu2S is converted into Cu+2 and SO2 then equivalent.
Answer» When Cu2S is converted into Cu+2 and SO2 then equivalent.

Discussion

7.	42 What ratio of Pb+2 to Sn+2 concentration is needed to reverse the following cell reaction? Sn(s) + Pb+2(aq) Sn+2(aq) +Pb(s) Eo of Sn+2/Sn = -0.136 V and Eo of Pb+2/Pb= -0.126 V
Answer» 42 What ratio of Pb+2 to Sn+2 concentration is needed to reverse the following cell reaction? Sn(s) + Pb+2(aq) <===> Sn+2(aq) +Pb(s) Eo of Sn+2/Sn = -0.136 V and Eo of Pb+2/Pb= -0.126 V

Discussion

8.	74.5g of a metallic chloride contains 35.5g of chlorine. The exact atomic weight of the metal is x and its specific heat is 0.0406 Cal/g-°C. The value of x is (1) 150 (3) 156 (2) 157.6 (4) 155.02
Answer» 74.5g of a metallic chloride contains 35.5g of chlorine. The exact atomic weight of the metal is x and its specific heat is 0.0406 Cal/g-°C. The value of x is (1) 150 (3) 156 (2) 157.6 (4) 155.02

Discussion

9.	When an electromagnetic radiation of wavelength 310 nm falls on the surface of sodium metal, electrons are emitted with K.Emax = 1.5 eV. Determine the work function Wo of metal.
Answer» When an electromagnetic radiation of wavelength $310 n m$ falls on the surface of sodium metal, electrons are emitted with $K . E_{m a x} = 1.5 e V$ . Determine the work function $W_{o}$ of metal.

Discussion

10.	Which of the following has the most negative heat of hydrogenation?
Answer» Which of the following has the most negative heat of hydrogenation?

Discussion

11.	When a molecule of a gas collides with the wall of a container it gets rebound and the momentum transferred to wall is equal to ___.
Answer» When a molecule of a gas collides with the wall of a container it gets rebound and the momentum transferred to wall is equal to ___.

Discussion

12.	21. Ammonium hydrogen sulphide dissociate as follows NH4HS(s) NH3(g)+H2S(g), if solid NH4HS is placed in an evacuated flask at certain temperature it will dissociate until the total pressure is 600 torr. (a) calculate the value of equilibrium constant for the dissociation reaction. (b) additional NH3 is introduced into the equilibrium mixture without changing the temperature until partial pressure of NH3 is 750 torr, what is the partial pressure of H2S under these conditions? What is the total pressure in the flask?
Answer» 21. Ammonium hydrogen sulphide dissociate as follows NH4HS(s) <=>NH3(g)+H2S(g), if solid NH4HS is placed in an evacuated flask at certain temperature it will dissociate until the total pressure is 600 torr. (a) calculate the value of equilibrium constant for the dissociation reaction. (b) additional NH3 is introduced into the equilibrium mixture without changing the temperature until partial pressure of NH3 is 750 torr, what is the partial pressure of H2S under these conditions? What is the total pressure in the flask?

Discussion

13.	A dilute solution contains ‘x’ moles of solute A in 1 kg of solvent with molar elevation constant Kb. The solute dimerises in the solution according to the following equation. The degree of association is (α): 2A⇌A2 The Van’t Hoff factor will be:
Answer» A dilute solution contains ‘x’ moles of solute A in 1 kg of solvent with molar elevation constant $K_{b}$ . The solute dimerises in the solution according to the following equation. The degree of association is $(α)$ : $2 A ⇌ A_{2}$ The Van’t Hoff factor will be:

Discussion

14.	What is/are true about the following compound. Cis-(1R, 3S)-di-sec-butylcyclobutane
Answer» What is/are true about the following compound. Cis-(1R, 3S)-di-sec-butylcyclobutane

14.

What is/are true about the following compound. Cis-(1R, 3S)-di-sec-butylcyclobutane

Answer»

What is/are true about the following compound.

Cis-(1R, 3S)-di-sec-butylcyclobutane

Discussion

15.	Battery acid is 4.27M H2SO4(aq) and has density 1.25 g/ML. What is the molality of H2SO4 in the solution?
Answer» Battery acid is 4.27M H2SO4(aq) and has density 1.25 g/ML. What is the molality of H2SO4 in the solution?

Discussion

16.	In faintly alkaline solution, 4 moles ofpermanganate anion quantitatively oxidize thiosulphate anions to produce X moles of sulphate anion. The value of X is (1) 8 (2) 6 (3) 3 (4)
Answer» In faintly alkaline solution, 4 moles ofpermanganate anion quantitatively oxidize thiosulphate anions to produce X moles of sulphate anion. The value of X is (1) 8 (2) 6 (3) 3 (4)

Discussion

17.	How many moles of electron weight one kg?
Answer» How many moles of electron weight one kg?

Discussion

18.	19. 12 gram of alkaline earth metal give 14.8 gram of its nitride atomic mass of metal is a 12 B 20 c 40d 14.2
Answer» 19. 12 gram of alkaline earth metal give 14.8 gram of its nitride atomic mass of metal is a 12 B 20 c 40d 14.2

Discussion

19.	Explain a process in which a biocatalyst is used in industrial preparation of a compound known to you.
Answer» Explain a process in which a biocatalyst is used in industrial preparation of a compound known to you.

Discussion

20.	The number of equations corresponds to the heat of formation at 298K H2(g)+Br2(l)→2HBr(g)C(diamond)+2H2(g)→CH4(g) C(graphite,s)+2H2(g)+12O2(l)→CH3OH(l)H2(g)+12O2(g)→H2O(l) C(graphite, s)+3H2(g)+12O2(l)→C2H5OH(l)12N2(g)+32H2(g)→NH3(g)C(graphite.s)+O2(g)→CO2(g)C(diamond)+12O2(g)→CO(g) ___
Answer» The number of equations corresponds to the heat of formation at 298K $H_{2 (g)} + B r_{2 (l)} \to 2 H B r_{(g)} C_{(d i a m o n d)} + 2 H_{2 (g)} \to C H_{4 (g)} C_{(g r a p h i t e, s)} + 2 H_{2} (g) + \frac{1}{2} O_{2} (l) \to C H_{3} O H (l) H_{2 (g)} + \frac{1}{2} O_{2 (g)} \to H_{2} O_{(l)} C_{(g r a p h i t e, s)} + 3 H_{2} (g) + \frac{1}{2} O_{2} (l) \to C_{2} H_{5} O H (l) \frac{1}{2} N_{2 (g)} + \frac{3}{2} H_{2 (g)} \to N H_{3 (g)} C_{(g r a p h i t e . s)} + O_{2 (g)} \to C O_{2 (g)} C_{(d i a m o n d)} + \frac{1}{2} O_{2 (g)} \to C O (g)$ ___

Discussion

21.	HNO2ACT AS OXIDANT IN WHICH ONE A)H2S B) BR2 EXPKAIN REASON ALS
Answer» HNO2ACT AS OXIDANT IN WHICH ONE A)H2S B) BR2 EXPKAIN REASON ALS

Discussion

22.	Rickets in children is due to the deficiency of
Answer» Rickets in children is due to the deficiency of

Discussion

23.	4 g of hydrogen reacts with 20 g of oxygen to form water.The mass of water formed i
Answer» 4 g of hydrogen reacts with 20 g of oxygen to form water.The mass of water formed i

Discussion

24.	In which of the following reactions, the Kolbe's electrolysis product is incorrectly mentioned?
Answer» In which of the following reactions, the Kolbe's electrolysis product is incorrectly mentioned?

Discussion

25.	A salt is formed due to reaction between an Oxy acid containing chlorine and a base containing monovalent metal is atomic mass X. The number of oxygen atoms in 1 molecule of the acid is more than the corresponding 'ic' acid.Calculate the molecular mass of the salt.(A)83.5 + x/4(b) 99.5+x(c) 83.5 +x (d) 99.5=x/2
Answer» A salt is formed due to reaction between an Oxy acid containing chlorine and a base containing monovalent metal is atomic mass X. The number of oxygen atoms in 1 molecule of the acid is more than the corresponding 'ic' acid.Calculate the molecular mass of the salt. (A)83.5 + x/4 (b) 99.5+x (c) 83.5 +x (d) 99.5=x/2

Discussion

26.	How to learn whole periodic table?
Answer» How to learn whole periodic table?

Discussion

27.	Which of the following behaves as both oxidising and reducing agents
Answer» Which of the following behaves as both oxidising and reducing agents

Discussion

28.	Which of the following halides have chain like structure in solid state?
Answer» Which of the following halides have chain like structure in solid state?

Discussion

29.	how to calculate valence electron for higher at.no. elements like pt,au etc
Answer» how to calculate valence electron for higher at.no. elements like pt,au etc

Discussion

30.	In the Lewis dot structure of SO2 explain how sulphur becomes stable.
Answer» In the Lewis dot structure of SO2 explain how sulphur becomes stable.

Discussion

31.	In the reactionC2O2−4+MnO−4+H+→Mn2++CO2+H2Othe reductant is
Answer» In the reaction $C_{2} O_{4}^{2 -} + M n O_{4}^{-} + H^{+} \to M n^{2 +} + C O_{2} + H_{2} O$ the reductant is

Discussion

32.	when propene reacts with CL2 in light gives A . A reacts with chlorine water to give B. B eacts with NaOH to give C . C reacts with ethoxide ion to give D . identify A,B,C,D in the series of reaction
Answer» when propene reacts with CL2 in light gives A . A reacts with chlorine water to give B. B eacts with NaOH to give C . C reacts with ethoxide ion to give D . identify A,B,C,D in the series of reaction

Discussion

33.	How to name a compound by iupac (complicated method)?
Answer» How to name a compound by iupac (complicated method)?

Discussion

34.	Which of the following arrangement for the three halogens Cl, Br and I when placed in the order of their increasing electron afinity is correct?
Answer» Which of the following arrangement for the three halogens Cl, Br and I when placed in the order of their increasing electron afinity is correct?

Discussion

35.	For the shown n-p-n transistor connected in common emitter configuration, the power gain and IB is [Internal resistance of transistor is 200 Ω]
Answer» For the shown $n-p-n$ transistor connected in common emitter configuration, the power gain and $I_{B}$ is [Internal resistance of transistor is $200 Ω$ ]

Discussion

36.	Calculate the radius of an electron in the first orbit of hydrogen atom, having a reduced mass (of the combination) 9.2×10−31 kg.
Answer» Calculate the radius of an electron in the first orbit of hydrogen atom, having a reduced mass (of the combination) $9.2 \times 10^{- 31} kg$ .

Discussion

37.	What is electrophilic and nucleophillic substitution reaction?
Answer» What is electrophilic and nucleophillic substitution reaction?

Discussion

38.	The molal elevation constant of water = 0.520C. The boiling point of 1.0 molal aqueous KCl solution (assuming complete dissociation of KCl), therefore, should be
Answer» The molal elevation constant of water = 0.52⁰C. The boiling point of 1.0 molal aqueous KCl solution (assuming complete dissociation of KCl), therefore, should be

Discussion

39.	Calculate the number of oxalic acid molecules in 100 mL of 0.02 N oxalic acid.
Answer» Calculate the number of oxalic acid molecules in $100 m L$ of $0.02 N$ oxalic acid.

Discussion

40.	What is an phenol
Answer» What is an phenol

Discussion

41.	If for the dissociation of NH2COONH4(s), Kp is 32 atm3 then equilibrium pressure is
Answer» If for the dissociation of NH2COONH4(s), Kp is 32 atm3 then equilibrium pressure is

Discussion

42.	how many ml of 0.1 M HCL are required to react completely with 1 g mixture of Na2CO3 and NAHCO3 containing equimolar amount of both ?
Answer» how many ml of 0.1 M HCL are required to react completely with 1 g mixture of Na2CO3 and NAHCO3 containing equimolar amount of both ?

Discussion

43.	Does CsCl show simple cubic lattice or bcc lattice?
Answer» Does CsCl show simple cubic lattice or bcc lattice?

Discussion

44.	How, banana comes under stem of rhizome?
Answer» How, banana comes under stem of rhizome?

Discussion

45.	What is the meaning of lattice point?
Answer» What is the meaning of lattice point?

Discussion

46.	nt ntt ntttConcentrated aqueous sulphuric acid is 98% H2SO4by mass and has density 1.8 gmL1. Volume of acid required to make 1 L of 0.1 M H2SO4isntnn ntnttntttnttttntttttnttttnttttt ntttttt5.55 mLnttttntttntttnttttntttttnttttnttttt ntttttt11.10 mLnttttntttntttnttttntttttnttttnttttt ntttttt16.65 mLnttttntttntttnttttntttttnttttnttttt ntttttt22.20 mLnttttntttnttntnn ntn
Answer» nt ntt ntttConcentrated aqueous sulphuric acid is 98% H2SO4by mass and has density 1.8 gmL1. Volume of acid required to make 1 L of 0.1 M H2SO4isntnn ntnttntttnttttntttttnttttnttttt ntttttt5.55 mLnttttntttntttnttttntttttnttttnttttt ntttttt11.10 mLnttttntttntttnttttntttttnttttnttttt ntttttt16.65 mLnttttntttntttnttttntttttnttttnttttt ntttttt22.20 mLnttttntttnttntnn ntn

Discussion

47.	By how much should the pressure be increased in order to decrease the volume of a gas by 5% at a constant temperature?
Answer» By how much should the pressure be increased in order to decrease the volume of a gas by 5% at a constant temperature?

Discussion

48.	Q. Ice crystallises in a hexagonal lattice having the volume of a unit cell as 132x10^-24. If the density is 0.92g/cm^3 at a give temp., Then the number of H2O molecules per unit cell is:-Options:1. 1 2. 23. 34. 4--------------------------------------According to the solution, the value of Z has been found. But we know that Z is the number of atoms, which is 4 for hcp. Then how come Z is taken as number of 'molecules' of H2O ??
Answer» Q. Ice crystallises in a hexagonal lattice having the volume of a unit cell as 132x10^-24. If the density is 0.92g/cm^3 at a give temp., Then the number of H2O molecules per unit cell is:- Options: 1. 1 2. 2 3. 3 4. 4 -------------------------------------- According to the solution, the value of Z has been found. But we know that Z is the number of atoms, which is 4 for hcp. Then how come Z is taken as number of 'molecules' of H2O ??

Discussion

49.	The resistance of a N/10 KCl aqueous solution is 245 ohm. If the electrodes in the cell are 4 cm apart and area having 7 cm2 each, the molar conductance of the solution will be A 233 B 2.33 C 23.32 D 0.233
Answer» The resistance of a N/10 KCl aqueous solution is 245 ohm. If the electrodes in the cell are 4 cm apart and area having 7 cm² each, the molar conductance of the solution will be A 233 B 2.33 C 23.32 D 0.233

49.

The resistance of a N/10 KCl aqueous solution is 245 ohm. If the electrodes in the cell are 4 cm apart and area having 7 cm2 each, the molar conductance of the solution will be A 233 B 2.33 C 23.32 D 0.233

Answer»

The resistance of a N/10 KCl aqueous solution is 245 ohm. If the electrodes in the cell are 4 cm apart and area having 7 cm² each, the molar conductance of the solution will be

A 233

B 2.33

C 23.32

D 0.233

Discussion

50.	Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone?
Answer» Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Calculate the mass of KBr (in g) that needs to be added to 1 litre of a 0.05 M solution of AgNO3 so that the precipitation of AgBr just starts. Solubility product (Ksp) of AgBr is 3.5×10−13. Take molecular mass of KBr to be 119 g mol−1

31. How to find a reaction whether it is a nucleophilic or electrophilic reaction ?

10. Number of electrons in 1) p orbitals 2) px orbital 3)dx*2-y*2 orbital With explination.

The general formula of silicate ion present in cyclic silicates is:

When Cu2S is converted into Cu+2 and SO2 then equivalent.

42 What ratio of Pb+2 to Sn+2 concentration is needed to reverse the following cell reaction? Sn(s) + Pb+2(aq) Sn+2(aq) +Pb(s) Eo of Sn+2/Sn = -0.136 V and Eo of Pb+2/Pb= -0.126 V

74.5g of a metallic chloride contains 35.5g of chlorine. The exact atomic weight of the metal is x and its specific heat is 0.0406 Cal/g-°C. The value of x is (1) 150 (3) 156 (2) 157.6 (4) 155.02

When an electromagnetic radiation of wavelength 310 nm falls on the surface of sodium metal, electrons are emitted with K.Emax = 1.5 eV. Determine the work function Wo of metal.

Which of the following has the most negative heat of hydrogenation?

When a molecule of a gas collides with the wall of a container it gets rebound and the momentum transferred to wall is equal to ___.

A dilute solution contains ‘x’ moles of solute A in 1 kg of solvent with molar elevation constant Kb. The solute dimerises in the solution according to the following equation. The degree of association is (α): 2A⇌A2 The Van’t Hoff factor will be:

What is/are true about the following compound. Cis-(1R, 3S)-di-sec-butylcyclobutane

Battery acid is 4.27M H2SO4(aq) and has density 1.25 g/ML. What is the molality of H2SO4 in the solution?

In faintly alkaline solution, 4 moles ofpermanganate anion quantitatively oxidize thiosulphate anions to produce X moles of sulphate anion. The value of X is (1) 8 (2) 6 (3) 3 (4)

How many moles of electron weight one kg?

19. 12 gram of alkaline earth metal give 14.8 gram of its nitride atomic mass of metal is a 12 B 20 c 40d 14.2

Explain a process in which a biocatalyst is used in industrial preparation of a compound known to you.

HNO2ACT AS OXIDANT IN WHICH ONE A)H2S B) BR2 EXPKAIN REASON ALS

Rickets in children is due to the deficiency of

4 g of hydrogen reacts with 20 g of oxygen to form water.The mass of water formed i

In which of the following reactions, the Kolbe's electrolysis product is incorrectly mentioned?

How to learn whole periodic table?

Which of the following behaves as both oxidising and reducing agents

Which of the following halides have chain like structure in solid state?

how to calculate valence electron for higher at.no. elements like pt,au etc

In the Lewis dot structure of SO2 explain how sulphur becomes stable.

In the reactionC2O2−4+MnO−4+H+→Mn2++CO2+H2Othe reductant is

when propene reacts with CL2 in light gives A . A reacts with chlorine water to give B. B eacts with NaOH to give C . C reacts with ethoxide ion to give D . identify A,B,C,D in the series of reaction

How to name a compound by iupac (complicated method)?

Which of the following arrangement for the three halogens Cl, Br and I when placed in the order of their increasing electron afinity is correct?

For the shown n-p-n transistor connected in common emitter configuration, the power gain and IB is [Internal resistance of transistor is 200 Ω]

Calculate the radius of an electron in the first orbit of hydrogen atom, having a reduced mass (of the combination) 9.2×10−31 kg.

What is electrophilic and nucleophillic substitution reaction?

The molal elevation constant of water = 0.520C. The boiling point of 1.0 molal aqueous KCl solution (assuming complete dissociation of KCl), therefore, should be

Calculate the number of oxalic acid molecules in 100 mL of 0.02 N oxalic acid.

What is an phenol

If for the dissociation of NH2COONH4(s), Kp is 32 atm3 then equilibrium pressure is

how many ml of 0.1 M HCL are required to react completely with 1 g mixture of Na2CO3 and NAHCO3 containing equimolar amount of both ?

Does CsCl show simple cubic lattice or bcc lattice?

How, banana comes under stem of rhizome?

What is the meaning of lattice point?

By how much should the pressure be increased in order to decrease the volume of a gas by 5% at a constant temperature?

The resistance of a N/10 KCl aqueous solution is 245 ohm. If the electrodes in the cell are 4 cm apart and area having 7 cm2 each, the molar conductance of the solution will be A 233 B 2.33 C 23.32 D 0.233

Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone?

10. Number of electrons in 1) p orbitals 2) px orbital 3)dx2-y2 orbital With explination.