46295 + Interview Questions in Chemistry

1.	The de Broglie wavelength of electron of He+ ion is 3.329 A. If the photon emitted upon de-excitation of this He+ ion is made to hit H-atom in its ground state so as to librate electron from it, what will be the de-Broglie's wavelength of photoelectron?
Answer» The de Broglie wavelength of electron of He+ ion is 3.329 A. If the photon emitted upon de-excitation of this He+ ion is made to hit H-atom in its ground state so as to librate electron from it, what will be the de-Broglie's wavelength of photoelectron?

Discussion

2.	Q21. Consider the following statements: 1. Hybrid vehicles have two sources available to them— a battery that powers an electric motor and a fuel tank that powers a normal petrol engine. 2. All EVs need to be charged from a charging point. Which of the statements are correct?
Answer» Q21. Consider the following statements: 1. Hybrid vehicles have two sources available to them— a battery that powers an electric motor and a fuel tank that powers a normal petrol engine. 2. All EVs need to be charged from a charging point. Which of the statements are correct?

2.

Q21. Consider the following statements: 1. Hybrid vehicles have two sources available to them— a battery that powers an electric motor and a fuel tank that powers a normal petrol engine. 2. All EVs need to be charged from a charging point. Which of the statements are correct?

Answer»

Q21. Consider the following statements:

1. Hybrid vehicles have two sources available to them— a battery that powers an electric motor and a fuel tank that powers a normal petrol engine.

2. All EVs need to be charged from a charging point.

Which of the statements are correct?

Discussion

3.	What is the ratio of wavelength of radiations emitted when an electron in a hydrogen atom jumps from fourth orbit to second orbit and from third orbit to second orbit?
Answer» What is the ratio of wavelength of radiations emitted when an electron in a hydrogen atom jumps from fourth orbit to second orbit and from third orbit to second orbit?

Discussion

4.	Show with mechanisms how alkyl halides react with sodium hydroxde, sodium iodide and water.
Answer» Show with mechanisms how alkyl halides react with sodium hydroxde, sodium iodide and water.

Discussion

5.	Thorium with atomic number 92 and mass number 238 disintegrates to give Pb with atomic number 82 and mass number 206. How many alpha and beta particles are emitted during this process?
Answer» Thorium with atomic number 92 and mass number 238 disintegrates to give Pb with atomic number 82 and mass number 206. How many alpha and beta particles are emitted during this process?

Discussion

6.	49 How many isomers [Co(en)2Br2]Cl has? A 4 B 6 C 5 D 3
Answer» 49 How many isomers [Co(en)2Br2]Cl has? A 4 B 6 C 5 D 3

Discussion

7.	What is the molar mass of the nonelectrolyte if 2 g of it when dissolved in 100 mL of solution has osmotic pressure of 0.1 atm at 27 oC?
Answer» What is the molar mass of the nonelectrolyte if 2 g of it when dissolved in 100 mL of solution has osmotic pressure of 0.1 atm at 27 ^oC?

Discussion

8.	What is the correct model is atom?
Answer» What is the correct model is atom?

Discussion

9.	Mention the conditions required to maximise the yield of ammonia.
Answer» Mention the conditions required to maximise the yield of ammonia.

Discussion

10.	Which of the following contains the least numberof molecules ?a) 4.4 g of CO2 b) 1.4 g of N2c) 2 g of H2 d) 1 g of O2
Answer» Which of the following contains the least number of molecules ? a) 4.4 g of CO2 b) 1.4 g of N2 c) 2 g of H2 d) 1 g of O2

Discussion

11.	Which of the following is/are example(s) of unsymmetrical or mixed ether?
Answer» Which of the following is/are example(s) of unsymmetrical or mixed ether?

Discussion

12.	What is the relation between number of ions and conductivity of a solution?
Answer» What is the relation between number of ions and conductivity of a solution?

Discussion

13.	A sample of calcium carbonate (CaCO3) has the following percentage composition Ca=40%;C=12%;O=48%If the law of constant proportions is true, then the weight of calcium in 4 g of a sample of calcium carbonate from another source will be
Answer» A sample of calcium carbonate $(C a C O_{3})$ has the following percentage composition $C a = 40 %; C = 12 %; O = 48 %$ If the law of constant proportions is true, then the weight of calcium in $4 g$ of a sample of calcium carbonate from another source will be

Discussion

14.	ntWhat is the atomic no. of einsteinium?What are its usesn
Answer» ntWhat is the atomic no. of einsteinium?What are its usesn

Discussion

15.	Two elements X and Y (atomic mass of X=88 u,Y=16 u) combine to give a compound that has 78.5% of X. 1 g of the gas occupies 0.1 L at STP The formula of the compound is:
Answer» Two elements $X$ and $Y$ (atomic mass of $X = 88 u$ , $Y = 16 u$ ) combine to give a compound that has $78.5 %$ of $X$ . $1 g$ of the gas occupies $0.1 L$ at STP The formula of the compound is:

Discussion

16.	43. Which compound is least acidic ? 1. Benzoic acid 2. o-chloro benzoic acid 3. o-methyl benzoic acid 4. o-nitro benzoic acid
Answer» 43. Which compound is least acidic ? 1. Benzoic acid 2. o-chloro benzoic acid 3. o-methyl benzoic acid 4. o-nitro benzoic acid

Discussion

17.	In a 1st order reaction A → products, the concentration of the reactant decreases to 6.25% of its initial value in 80 minutes. What is (i) the rate constant and (ii) the rate of reaction, 100 minutes after the start, if the initial concentration is 0.2 mole/litre?
Answer» In a 1st order reaction A $\to$ products, the concentration of the reactant decreases to 6.25 $%$ of its initial value in 80 minutes. What is (i) the rate constant and (ii) the rate of reaction, 100 minutes after the start, if the initial concentration is 0.2 mole/litre?

Discussion

18.	95Am241 and 90Th234 belong respectively to:
Answer» $_{95} A m^{241} a n d_{90} T h^{234}$ belong respectively to:

Discussion

19.	What is the distance of the third next atom/ion in ZnS w.r.t. the corner S2- ion, if the edge length of the unit cell is a.
Answer» What is the distance of the third next atom/ion in ZnS w.r.t. the corner S2- ion, if the edge length of the unit cell is a.

Discussion

20.	Refer the following compounds and answer the questions that follows: How many of the above compounds can (1) serve only as H – bond acceptors?___8
Answer» Refer the following compounds and answer the questions that follows: How many of the above compounds can (1) serve only as H – bond acceptors?___ 8

Discussion

21.	Howmuch copper can be obtained from 100 g of copper sulphate (CuSO4)?
Answer» How much copper can be obtained from 100 g of copper sulphate (CuSO₄)?

Discussion

22.	The entropy change for the conversion of 36 g water to vapour at its boiling point at 1 atm is (Enthalpy of vaporization for water is 40.63 kJ mol–1)
Answer» The entropy change for the conversion of 36 g water to vapour at its boiling point at 1 atm is (Enthalpy of vaporization for water is 40.63 kJ mol–1)

Discussion

23.	if 100 ml of 1 N H_2so_4 were mixed with 100ml of 1M Naoh the solution ph i
Answer» if 100 ml of 1 N H_2so_4 were mixed with 100ml of 1M Naoh the solution ph i

Discussion

24.	Choose the correct answer. A thermodynamic state function is a quantity (i) used to determine heat changes (ii) whose value is independent of path (iii) used to determine pressure volume work (iv) whose value depends on temperature only.
Answer» Choose the correct answer. A thermodynamic state function is a quantity (i) used to determine heat changes (ii) whose value is independent of path (iii) used to determine pressure volume work (iv) whose value depends on temperature only.

24.

Choose the correct answer. A thermodynamic state function is a quantity (i) used to determine heat changes (ii) whose value is independent of path (iii) used to determine pressure volume work (iv) whose value depends on temperature only.

Answer»

Choose the correct answer. A thermodynamic state function is a quantity

(i) used to determine heat changes

(ii) whose value is independent of path

(iii) used to determine pressure volume work

(iv) whose value depends on temperature only.

Discussion

25.	30. Osmotic pressure of a solution(density is 1 g/ml)containing 3g of glucose in 60 g of water at 15 degree celsius is?
Answer» 30. Osmotic pressure of a solution(density is 1 g/ml)containing 3g of glucose in 60 g of water at 15 degree celsius is?

Discussion

26.	The purpose of smelting an ore is
Answer» The purpose of smelting an ore is

Discussion

27.	Write maindifferences between the properties of white phosphorus and redphosphorus.
Answer» Write main differences between the properties of white phosphorus and red phosphorus.

Discussion

28.	how many no of molecules of water is present in 18ml of wate
Answer» how many no of molecules of water is present in 18ml of wate

Discussion

29.	what is coordination isomerism?
Answer» what is coordination isomerism?

Discussion

30.	An aqueous solution containing 0.10 g KIO3 (formula weight =214) was treated with excess of KI solution. The solution was acidified with HCl. The liberated I2 consumed 45.0 mL of thiosulphate solution to decolourise the blue strach-iodine complex. Calculate the molarity of the sodium thiosulphate solution. (Report your answer upto two decimal only)
Answer» An aqueous solution containing $0.10 g K I O_{3}$ (formula weight $= 214$ ) was treated with excess of $K I$ solution. The solution was acidified with $H C l$ . The liberated $I_{2}$ consumed $45.0 mL$ of thiosulphate solution to decolourise the blue strach-iodine complex. Calculate the molarity of the sodium thiosulphate solution. (Report your answer upto two decimal only)

Discussion

31.	Explain the ortho effect on benzoic acid and Aniline .how does it increases the acidity .
Answer» Explain the ortho effect on benzoic acid and Aniline .how does it increases the acidity .

Discussion

32.	NaOH + Ca(OH)2 = Plz explain What it will give and balance eqn
Answer» NaOH + Ca(OH)2 = Plz explain What it will give and balance eqn

32.

NaOH + Ca(OH)2 = Plz explain What it will give and balance eqn

Answer»

NaOH + Ca(OH)2 =

Plz explain

What it will give and balance eqn

Discussion

33.	Experimentally it was found that a metal oxide has the formula M0.98O. Metal M is present as M2+ and M3+ in its oxide. The fraction of the metal which exists as M3+ would be:
Answer» Experimentally it was found that a metal oxide has the formula $M_{0.98} O$ . Metal M is present as $M^{2 +}$ and $M^{3 +}$ in its oxide. The fraction of the metal which exists as $M^{3 +}$ would be:

Discussion

34.	at temperature T K, Pcl5 is 50% dissociated at an equilibrium pressure of 4atm.at what pressure it would dissociate to the extent of 80% at the same temperature?
Answer» at temperature T K, Pcl5 is 50% dissociated at an equilibrium pressure of 4atm.at what pressure it would dissociate to the extent of 80% at the same temperature?

Discussion

35.	What is the maximum number of emmision lines obtained when the excited electron of a hydrogen atom in n=5 drops to ground state?
Answer» What is the maximum number of emmision lines obtained when the excited electron of a hydrogen atom in n=5 drops to ground state?

Discussion

36.	The spectrum of He is expected to be similar to
Answer» The spectrum of He is expected to be similar to

36.

The spectrum of He is expected to be similar to

Answer»

The spectrum of He is expected to be similar to

Discussion

37.	U with atomic number 92 and mass number 238 is radioactive and it emits alpha and beta particles to form Pb with atomic number 82 and mass number 206. Calculate the number of alpha and beta particles emitted in this conversation. An ore of U with atomic number 92 and mass number 238 is found to contain U and Pb in the weight ratio of 1:0.1. The half-life period of U is 4.5×109 years. Calculate the age of the ore.
Answer» U with atomic number 92 and mass number 238 is radioactive and it emits alpha and beta particles to form Pb with atomic number 82 and mass number 206. Calculate the number of alpha and beta particles emitted in this conversation. An ore of U with atomic number 92 and mass number 238 is found to contain U and Pb in the weight ratio of 1:0.1. The half-life period of U is $4.5 \times 10^{9}$ years. Calculate the age of the ore.

37.

U with atomic number 92 and mass number 238 is radioactive and it emits alpha and beta particles to form Pb with atomic number 82 and mass number 206. Calculate the number of alpha and beta particles emitted in this conversation. An ore of U with atomic number 92 and mass number 238 is found to contain U and Pb in the weight ratio of 1:0.1. The half-life period of U is 4.5×109 years. Calculate the age of the ore.

Answer»

U with atomic number 92 and mass number 238 is radioactive and it emits alpha and beta particles to form Pb with atomic number 82 and mass number 206. Calculate the number of alpha and beta particles emitted in this conversation.

An ore of U with atomic number 92 and mass number 238 is found to contain U and Pb in the weight ratio of 1:0.1. The half-life period of U is $4.5 \times 10^{9}$ years. Calculate the age of the ore.

Discussion

38.	34.05mL of phosphorus vapour weighs 0.0625 g at 546 °C and 0.1 barpressure. What is the molar mass of phosphorus?
Answer» 34.05 mL of phosphorus vapour weighs 0.0625 g at 546 °C and 0.1 bar pressure. What is the molar mass of phosphorus?

Discussion

39.	Calculate weight of CO having the same no. Of oxygen atoms as are present in 22g of CO²
Answer» Calculate weight of CO having the same no. Of oxygen atoms as are present in 22g of CO²

Discussion

40.	The number of atoms in 4.25 g of NH3 is approximately:
Answer» The number of atoms in $4.25 g$ of $N H_{3}$ is approximately:

Discussion

41.	the percentage strength of solution obtained by mixing equal volumes of two peroxide solutions of "10 volume" and "20 volume strength is
Answer» the percentage strength of solution obtained by mixing equal volumes of two peroxide solutions of "10 volume" and "20 volume strength is

Discussion

42.	3. A hydrogen atom is in the ground state . In order to get six lines in its emission spectrum , wavelength of incident radiation must be 1) 800A^° 2) 825A^° 3) 970A^° 4) 1025A^°
Answer» 3. A hydrogen atom is in the ground state . In order to get six lines in its emission spectrum , wavelength of incident radiation must be 1) 800A^° 2) 825A^° 3) 970A^° 4) 1025A^°

Discussion

43.	Which of the following order of melting point is correct
Answer» Which of the following order of melting point is correct

Discussion

44.	pπ−dπ back bonding cannot occur in:
Answer» $p π - d π$ back bonding cannot occur in:

Discussion

45.	The main axis of a diatomic molecule is z, molecular orbital p_{x }and p_x overlap to form which of the following orbitals 1) π molecular orbital 2) σ molecular orbital 3 No bond will form
Answer» The main axis of a diatomic molecule is z, molecular orbital p_{x }and p_x overlap to form which of the following orbitals 1) π molecular orbital 2) σ molecular orbital 3 No bond will form

45.

The main axis of a diatomic molecule is z, molecular orbital p_{x }and p_x overlap to form which of the following orbitals 1) π molecular orbital 2) σ molecular orbital 3 No bond will form

Answer»

The main axis of a diatomic molecule is z, molecular orbital p_{x }and p_x overlap to form which of the following orbitals

1) π molecular orbital 2) σ molecular orbital 3 No bond will form

Discussion

46.	Predict the major product.
Answer» Predict the major product.

Discussion

47.	ionization of energy of H^{+ } ?
Answer» ionization of energy of H^{+ } ?

Discussion

48.	The diffrence between heat of reaction at constant volume and constant pressure for the reaction C2H2(g)+52O2(g)→2CO2(g)+H2O(l). At 300K in Kcal is : [Given: R=2 cal/mol.K]
Answer» The diffrence between heat of reaction at constant volume and constant pressure for the reaction $C_{2} H_{2} (g) + \frac{5}{2} O_{2} (g) \to 2 C O_{2} (g) + H_{2} O (l) . A t 300 K i n K c a l i s : [G i v e n : R = 2 c a l / m o l . K]$

48.

The diffrence between heat of reaction at constant volume and constant pressure for the reaction C2H2(g)+52O2(g)→2CO2(g)+H2O(l). At 300K in Kcal is : [Given: R=2 cal/mol.K]

Answer»

The diffrence between heat of reaction at constant volume and constant pressure for the reaction

$C_{2} H_{2} (g) + \frac{5}{2} O_{2} (g) \to 2 C O_{2} (g) + H_{2} O (l) . A t 300 K i n K c a l i s : [G i v e n : R = 2 c a l / m o l . K]$

Discussion

49.	the reaction at equilibrium :A + B = 2C ; K1C = D ; K2 then equilibrium constant for this reaction is ?A+B=2D
Answer» the reaction at equilibrium : A + B = 2C ; K1 C = D ; K2 then equilibrium constant for this reaction is ? A+B=2D

Discussion

50.	Differences between catalyst and oxidising agent in oxidation and addition reaction
Answer» Differences between catalyst and oxidising agent in oxidation and addition reaction

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The de Broglie wavelength of electron of He+ ion is 3.329 A. If the photon emitted upon de-excitation of this He+ ion is made to hit H-atom in its ground state so as to librate electron from it, what will be the de-Broglie's wavelength of photoelectron?

Q21. Consider the following statements: 1. Hybrid vehicles have two sources available to them— a battery that powers an electric motor and a fuel tank that powers a normal petrol engine. 2. All EVs need to be charged from a charging point. Which of the statements are correct?

What is the ratio of wavelength of radiations emitted when an electron in a hydrogen atom jumps from fourth orbit to second orbit and from third orbit to second orbit?

Show with mechanisms how alkyl halides react with sodium hydroxde, sodium iodide and water.

Thorium with atomic number 92 and mass number 238 disintegrates to give Pb with atomic number 82 and mass number 206. How many alpha and beta particles are emitted during this process?

49 How many isomers [Co(en)2Br2]Cl has? A 4 B 6 C 5 D 3

What is the molar mass of the nonelectrolyte if 2 g of it when dissolved in 100 mL of solution has osmotic pressure of 0.1 atm at 27 oC?

What is the correct model is atom?

Mention the conditions required to maximise the yield of ammonia.

Which of the following contains the least numberof molecules ?a) 4.4 g of CO2 b) 1.4 g of N2c) 2 g of H2 d) 1 g of O2

Which of the following is/are example(s) of unsymmetrical or mixed ether?

What is the relation between number of ions and conductivity of a solution?

A sample of calcium carbonate (CaCO3) has the following percentage composition Ca=40%;C=12%;O=48%If the law of constant proportions is true, then the weight of calcium in 4 g of a sample of calcium carbonate from another source will be

ntWhat is the atomic no. of einsteinium?What are its usesn

Two elements X and Y (atomic mass of X=88 u,Y=16 u) combine to give a compound that has 78.5% of X. 1 g of the gas occupies 0.1 L at STP The formula of the compound is:

43. Which compound is least acidic ? 1. Benzoic acid 2. o-chloro benzoic acid 3. o-methyl benzoic acid 4. o-nitro benzoic acid

In a 1st order reaction A → products, the concentration of the reactant decreases to 6.25% of its initial value in 80 minutes. What is (i) the rate constant and (ii) the rate of reaction, 100 minutes after the start, if the initial concentration is 0.2 mole/litre?

95Am241 and 90Th234 belong respectively to:

What is the distance of the third next atom/ion in ZnS w.r.t. the corner S2- ion, if the edge length of the unit cell is a.

Refer the following compounds and answer the questions that follows: How many of the above compounds can (1) serve only as H – bond acceptors?___8

Howmuch copper can be obtained from 100 g of copper sulphate (CuSO4)?

The entropy change for the conversion of 36 g water to vapour at its boiling point at 1 atm is (Enthalpy of vaporization for water is 40.63 kJ mol–1)

if 100 ml of 1 N H_2so_4 were mixed with 100ml of 1M Naoh the solution ph i

Choose the correct answer. A thermodynamic state function is a quantity (i) used to determine heat changes (ii) whose value is independent of path (iii) used to determine pressure volume work (iv) whose value depends on temperature only.

30. Osmotic pressure of a solution(density is 1 g/ml)containing 3g of glucose in 60 g of water at 15 degree celsius is?

The purpose of smelting an ore is

Write maindifferences between the properties of white phosphorus and redphosphorus.

how many no of molecules of water is present in 18ml of wate

what is coordination isomerism?

Explain the ortho effect on benzoic acid and Aniline .how does it increases the acidity .

NaOH + Ca(OH)2 = Plz explain What it will give and balance eqn

Experimentally it was found that a metal oxide has the formula M0.98O. Metal M is present as M2+ and M3+ in its oxide. The fraction of the metal which exists as M3+ would be:

at temperature T K, Pcl5 is 50% dissociated at an equilibrium pressure of 4atm.at what pressure it would dissociate to the extent of 80% at the same temperature?

What is the maximum number of emmision lines obtained when the excited electron of a hydrogen atom in n=5 drops to ground state?

The spectrum of He is expected to be similar to

34.05mL of phosphorus vapour weighs 0.0625 g at 546 °C and 0.1 barpressure. What is the molar mass of phosphorus?

Calculate weight of CO having the same no. Of oxygen atoms as are present in 22g of CO²

The number of atoms in 4.25 g of NH3 is approximately:

the percentage strength of solution obtained by mixing equal volumes of two peroxide solutions of "10 volume" and "20 volume strength is

3. A hydrogen atom is in the ground state . In order to get six lines in its emission spectrum , wavelength of incident radiation must be 1) 800A^° 2) 825A^° 3) 970A^° 4) 1025A^°

Which of the following order of melting point is correct

pπ−dπ back bonding cannot occur in:

The main axis of a diatomic molecule is z, molecular orbital p_{x }and p_x overlap to form which of the following orbitals 1) π molecular orbital 2) σ molecular orbital 3 No bond will form

Predict the major product.

ionization of energy of H^{+ } ?

The diffrence between heat of reaction at constant volume and constant pressure for the reaction C2H2(g)+52O2(g)→2CO2(g)+H2O(l). At 300K in Kcal is : [Given: R=2 cal/mol.K]

the reaction at equilibrium :A + B = 2C ; K1C = D ; K2 then equilibrium constant for this reaction is ?A+B=2D

Differences between catalyst and oxidising agent in oxidation and addition reaction