46295 + Interview Questions in Chemistry

1.	The value of Planck's constant is 6.63×10−34Js. The velocity of light is 3×108 m/s. If the wavenumber of a quantum of light is 2.5×107 m−1, calculate its frequency.
Answer» The value of Planck's constant is $6.63 \times 10^{- 34} J s .$ The velocity of light is $3 \times 10^{8} m / s .$ If the wavenumber of a quantum of light is $2.5 \times 10^{7} m^{- 1}$ , calculate its frequency.

Discussion

2.	Calculate the standard internal energy change for the reaction at 25⁰C:- C2H4(g) + 3O2(g)----------à 2CO2 (g) + 2H2O (l) DH for C2H4 (g) = 52.30 kJ/mole, CO2 = - 393.5 kJ/mole H2O = - 286 kJ/mole R = 8.314 J/K/mole.
Answer» Calculate the standard internal energy change for the reaction at 25⁰C:- C₂H₄(g) + 3O₂(g)----------à 2CO₂ (g) + 2H₂O (l) DH for C₂H₄ (g) = 52.30 kJ/mole, CO₂ = - 393.5 kJ/mole H₂O = - 286 kJ/mole R = 8.314 J/K/mole.

2.

Calculate the standard internal energy change for the reaction at 25⁰C:- C2H4(g) + 3O2(g)----------à 2CO2 (g) + 2H2O (l) DH for C2H4 (g) = 52.30 kJ/mole, CO2 = - 393.5 kJ/mole H2O = - 286 kJ/mole R = 8.314 J/K/mole.

Answer»

Calculate the standard internal energy change for the reaction at 25⁰C:-

C₂H₄(g) + 3O₂(g)----------à 2CO₂ (g) + 2H₂O (l) DH for C₂H₄ (g) = 52.30 kJ/mole,

CO₂ = - 393.5 kJ/mole H₂O = - 286 kJ/mole R = 8.314 J/K/mole.

Discussion

3.	In the extraction of Iron, the function of limestone is as:
Answer» In the extraction of Iron, the function of limestone is as:

Discussion

4.	Given the following reaction at equilibrium N2(g)+3H2(g)⇌2NH3(g). Some inert gas is added at constant volume. Predict which of the following facts will be affected?
Answer» Given the following reaction at equilibrium $N_{2} (g) + 3 H_{2} (g) ⇌ 2 N H_{3} (g)$ . Some inert gas is added at constant volume. Predict which of the following facts will be affected?

Discussion

5.	Which one of the following ores is best concentrated by froth floatation method ?
Answer» Which one of the following ores is best concentrated by froth floatation method ?

Discussion

6.	Proteins perform many physiological functions. For example, some functions as enzymes. One of the following represents an additional function that some proteins discharge (a) Antibioties (b) Pigment conferring colour to skin (c) Pigments making colours of flowers.(d) Hormons
Answer» Proteins perform many physiological functions. For example, some functions as enzymes. One of the following represents an additional function that some proteins discharge (a) Antibioties (b) Pigment conferring colour to skin (c) Pigments making colours of flowers.(d) Hormons

6.

Proteins perform many physiological functions. For example, some functions as enzymes. One of the following represents an additional function that some proteins discharge (a) Antibioties (b) Pigment conferring colour to skin (c) Pigments making colours of flowers.(d) Hormons

Answer»

Proteins perform many physiological functions. For example, some functions as enzymes. One of the following represents an additional function that some proteins discharge

(a) Antibioties (b) Pigment conferring colour to skin

(c) Pigments making colours of flowers.(d) Hormons

Discussion

7.	Which transition of electron in the hydrogen atom emits maximum energy?
Answer» Which transition of electron in the hydrogen atom emits maximum energy?

Discussion

8.	Following compounds are given (i) CH3 CH2 OH (ii) CH3 CO CH3 (iii) (iv) CH3 OH Which of the above compounds, on being warmed with iodine solution andNaOH , will give Iodo form?
Answer» Following compounds are given (i) CH₃ CH₂ OH (ii) CH₃ CO CH₃ _(iii)(iv) CH₃ OH Which of the above compounds, on being warmed with iodine solution andNaOH , will give Iodo form?

8.

Following compounds are given (i) CH3 CH2 OH (ii) CH3 CO CH3 (iii) (iv) CH3 OH Which of the above compounds, on being warmed with iodine solution andNaOH , will give Iodo form?

Answer»

Following compounds are given

(i) CH₃ CH₂ OH (ii) CH₃ CO CH₃

_(iii)(iv) CH₃ OH

Which of the above compounds, on being warmed with iodine solution andNaOH , will give Iodo form?

Discussion

9.	Osmotic pressure of 0.1 M solution of NaCl and Na2SO4 will be
Answer» Osmotic pressure of 0.1 M solution of NaCl and Na₂SO₄ will be

Discussion

10.	Iodoethane reacts with sodium in the presence of dry ether. The product is
Answer» Iodoethane reacts with sodium in the presence of dry ether. The product is

10.

Iodoethane reacts with sodium in the presence of dry ether. The product is

Answer»

Iodoethane reacts with sodium in the presence of dry ether. The product is

Discussion

11.	In the following sequence, product I, J, and L are formed. K represents a reagent. The structure of the product L is:
Answer» In the following sequence, product I, J, and L are formed. K represents a reagent. The structure of the product L is:

Discussion

12.	The magnetic moment of Cr3+ is
Answer» The magnetic moment of $C r^{3 +}$ is

Discussion

13.	Allyl chloride CH2=CH-CH2-Cl IUPAC NAME : 3-Chloro-1-propene Why not 1-Chloro-2-propene
Answer» Allyl chloride CH2=CH-CH2-Cl IUPAC NAME : 3-Chloro-1-propene Why not 1-Chloro-2-propene

Discussion

14.	For a certain reaction large fraction of molecules has energy more than the threshold energy, yet the rate of reaction is very slow. Why?
Answer» For a certain reaction large fraction of molecules has energy more than the threshold energy, yet the rate of reaction is very slow. Why?

Discussion

15.	A solution contains non-volatile solute of molecular mass MP. Which of the following can be used to calculate molecular mass of the solute in terms of osmotic pressure (m = Mass of solute, V = Volume of solution and p = Osmotic pressure)
Answer» A solution contains non-volatile solute of molecular mass M_P. Which of the following can be used to calculate molecular mass of the solute in terms of osmotic pressure (m = Mass of solute, V = Volume of solution and p = Osmotic pressure)

Discussion

16.	Q)What would be the board level definition of synergic effect ????? And how synergic effect strengthens the bond between metal and the carbonyl group ??????
Answer» Q)What would be the board level definition of synergic effect ????? And how synergic effect strengthens the bond between metal and the carbonyl group ??????

Discussion

17.

n kmol of a monochromatic ideal gas is taken quasi-statically from state A to state C along the straight line shown in the given figure. Alternatively, the same gas is shown in the taken quasi-statically from A to C along the path ABC. Match the column (i) with column (ii) on the basis of the given information. Column (I) Column (II) i. The heat ΔH added to the gas along the straight line path AC a.2PAVA ii. Change in ΔU of the gas along the straight line path AC b. 132PAVA iii. The work done by the gas along the path ABC c. 6PAVA iv. The heat ΔH added to the gas along the path ABC d. 92PAVA

Answer»

n k

mol of a monochromatic ideal gas is taken quasi-statically from state A to state C along the straight line shown in the given figure. Alternatively, the same gas is shown in the taken quasi-statically from A to C along the path ABC.

Match the column (i) with column (ii) on the basis of the given information.

Column (I)

Column (II)

i. The heat

Δ H

added to the gas along the straight line path AC

a.

2 P_{A} V_{A}

ii. Change in

Δ U

of the gas along the straight line path AC

b.

\frac{13}{2} P_{A} V_{A}

iii. The work done by the gas
along the path ABC

c.

6 P_{A} V_{A}

iv. The heat

Δ H

added to
the gas along the path ABC

d.

\frac{9}{2} P_{A} V_{A}

Discussion

18.	Assume that the decomposition of HNO3 can be represented by the following equation 4HNO3(g)⇌4NO2(g)+2H2O(g)+O2(g) and the reaction approaches equilibrium at 400 K temperature and 30 atm pressure. At equilibrium partial pressure of HNO3 is 2 atm. Calculate Kc at 400 K : (Use R= 0.08 Latm/molK)
Answer» Assume that the decomposition of $H N O_{3}$ can be represented by the following equation $4 H N O_{3} (g) ⇌ 4 N O_{2} (g) + 2 H_{2} O (g) + O_{2} (g)$ and the reaction approaches equilibrium at $400 K$ temperature and 30 atm pressure. At equilibrium partial pressure of $H N O_{3}$ is $2 a t m$ . Calculate $K_{c}$ at $400 K$ : (Use R= 0.08 Latm/molK)

Discussion

19.	The solubility product of MA is 2×10−12 at 25∘C. A solution is 0.1 M in M(NO3)2 and it is saturated with 0.01 M H2A, then the minimum pH that must be maintained to start precipitation of MA is (Given: Ka1(H2A)=4×10−7;Ka2(H2A)=5×10−11)
Answer» The solubility product of $M A$ is $2 \times 10^{- 12}$ at $25^{\circ} C$ . A solution is 0.1 M in $M (N O_{3})_{2}$ and it is saturated with 0.01 M $H_{2} A$ , then the minimum pH that must be maintained to start precipitation of $M A$ is (Given: $K_{a 1} (H_{2} A) = 4 \times 10^{- 7}; K_{a 2} (H_{2} A) = 5 \times 10^{- 11}$ )

Discussion

20.	Among the following, the number of aromatic compound(s) is
Answer» Among the following, the number of aromatic compound(s) is

20.

Among the following, the number of aromatic compound(s) is

Answer»

Among the following, the number of aromatic compound(s) is

Discussion

21.	Arrange the following hydrides in increasing acidic strength.
Answer» Arrange the following hydrides in increasing acidic strength.

Discussion

22.	0.1 M CH3COOH is titrated with 0.1M NaOH solution. What would be the difference in pH between 14 and 34 stages of neutralization of acid
Answer» 0.1 M $C H_{3}$ COOH is titrated with 0.1M NaOH solution. What would be the difference in pH between $\frac{1}{4}$ and $\frac{3}{4}$ stages of neutralization of acid

Discussion

23.	On a ship sailing in the Pacific ocean, where the temperature is 23.4∘C, a balloon is filled with 2 L of air. What will be the volume of the balloon when the ship reaches the Indian ocean, where the temperature is 26.1∘C?
Answer» On a ship sailing in the Pacific ocean, where the temperature is ${23.4}^{\circ} C$ , a balloon is filled with $2 L$ of air. What will be the volume of the balloon when the ship reaches the Indian ocean, where the temperature is ${26.1}^{\circ} C$ ?

Discussion

24.	XeF6 on complete hydrolysis gives:
Answer» $X e F_{6}$ on complete hydrolysis gives:

Discussion

25.	2,3-Dimethylbut-2-ene can be preparaed by heating which of the following compounds with a strong acid?
Answer» $2,3-Dimethylbut-2-ene$ can be preparaed by heating which of the following compounds with a strong acid?

Discussion

26.	Which one of the following represents the electronic configuration of the most electropositive element?
Answer» Which one of the following represents the electronic configuration of the most electropositive element?

Discussion

27.	Find the dissociation constant Ka of a weak monobasic acid which is 3.5% dissociated in a N10 solution at 25∘C
Answer» Find the dissociation constant $K_{a}$ of a weak monobasic acid which is 3.5% dissociated in a $\frac{N}{10}$ solution at $25^{\circ} C$

Discussion

28.	Ester 2eq RMgX−−−−−−→P, product P is :
Answer» Ester $2 e q R M g X - ----- \to P,$ product P is :

Discussion

29.	What is meant exactly by interfacial separation between the atoms?
Answer» What is meant exactly by interfacial separation between the atoms?

Discussion

30.	For the following reaction, C(diamond,s)+O2(g)→CO2(g);△H=−94.3 kcal C(graphite,s)+O2(g)→CO2(g);△H=−97.6 kcal The heat required to change 1 g of C(diamond,s)→C(graphite,s) is:
Answer» For the following reaction, $C (d i a m o n d, s) + O_{2} (g) \to C O_{2} (g); △ H = - 94.3 k c a l$ $C (g r a p h i t e, s) + O_{2} (g) \to C O_{2} (g); △ H = - 97.6 k c a l$ The heat required to change 1 g of $C (d i a m o n d, s) \to C (g r a p h i t e, s)$ is:

Discussion

31.	The molar mass of a certain gas B is double than that of A. Also the RMS velocity of gas A is 200 ms−1 at a certain temperature. RMS velocity of gas B at the temperature half of the temperature of A is:
Answer» The molar mass of a certain gas $B$ is double than that of $A$ . Also the RMS velocity of gas $A$ is $200 {ms}^{- 1}$ at a certain temperature. RMS velocity of gas $B$ at the temperature half of the temperature of $A$ is:

Discussion

32.	The total vapour pressure of a 4 mole % solution of ammonia in water at 293 K is 50.0 torr; the vapour pressure of pure water is 17.0 torr at this temperature. Applying Henry's and Raoult's laws, the total vapour pressure for a 5 mole % solution is (in torr).
Answer» The total vapour pressure of a 4 mole % solution of ammonia in water at 293 K is 50.0 torr; the vapour pressure of pure water is 17.0 torr at this temperature. Applying Henry's and Raoult's laws, the total vapour pressure for a 5 mole % solution is (in torr).

Discussion

33.	A dye emits 75% of the absorbed energy as fluorescence. The number of quanta absorbed and emitted out are in the ratio 2:3. Find the wavelength of the emitted radiation if the absorbed radiation has a wavelength of x oA.
Answer» A dye emits $75 %$ of the absorbed energy as fluorescence. The number of quanta absorbed and emitted out are in the ratio $2 : 3$ . Find the wavelength of the emitted radiation if the absorbed radiation has a wavelength of $x o A$ .

Discussion

34.	Sodium hydroxide is used in
Answer» Sodium hydroxide is used in

Discussion

35.	What is quanta?
Answer» What is quanta?

Discussion

36.	Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are, respectively
Answer» Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are, respectively

Discussion

37.	The number of sp2 hybridised boron atoms in borax are
Answer» The number of $s p^{2}$ hybridised boron atoms in borax are

Discussion

38.	The outer electronic configuration of Gd (Atomic No:64) is:
Answer» The outer electronic configuration of $G d$ (Atomic No:64) is:

Discussion

39.	A solution of CuSO4 is
Answer» A solution of $C u S O_{4}$ is

Discussion

40.	Calculate the reasonance energy of N2O from the following data.of △Hof N2O = 82 kJ mol−1 Bond energy of N ≡ N, N = N, O = O and N = O bonds are 946, 418, 498 & 607 kJ mol−1 respectively.
Answer» Calculate the reasonance energy of $N_{2} O$ from the following data.of $△ H_{f}^{o}$ $N_{2} O = 82 k J m o l^{- 1}$ Bond energy of N $\equiv$ N, N = N, O = O and N = O bonds are 946, 418, 498 & 607 $k J m o l^{- 1}$ respectively.

Discussion

41.	ΔH∘f of a hypothetical salt, MX is 150 kJmol−1 and for MX2 it is −600 kJmol−1. The enthalpy of disproportionation of MX is −100 x kJmol−1. The value of x is
Answer» $Δ H_{f}^{\circ}$ of a hypothetical salt, $M X$ is $150 {kJmol}^{- 1}$ and for $M X_{2}$ it is $- 600 {kJmol}^{- 1}$ . The enthalpy of disproportionation of $M X$ is $- 100 {x kJmol}^{- 1}$ . The value of $x$ is

Discussion

42.	Number of moles of K2Cr2O7 reduced by one mole of Sn2+ ions (in acidic medium) is:
Answer» Number of moles of $K_{2} C r_{2} O_{7}$ reduced by one mole of $S n^{2 +}$ ions (in acidic medium) is:

Discussion

43.	Schiff bases are condensation products of and carbonyls compounds.
Answer» Schiff bases are condensation products of and carbonyls compounds.

Discussion

44.	Oh! We are nearly there. You can almost smell copper. Molten Copper Matte is then transferred to a Bessemer converter where it undergoes___reduction
Answer» Oh! We are nearly there. You can almost smell copper. Molten Copper Matte is then transferred to a Bessemer converter where it undergoes___reduction

Discussion

45.	Find total pressure observed after opening the stopcock . [neglecting the volume of the tube connecting the two bulbs]
Answer» Find total pressure observed after opening the stopcock . [neglecting the volume of the tube connecting the two bulbs]

45.

Find total pressure observed after opening the stopcock . [neglecting the volume of the tube connecting the two bulbs]

Answer»

Find total pressure observed after opening the stopcock . [neglecting the volume of the tube connecting the two bulbs]

Discussion

46.	How come the stability of the nucleus was explained by naming a force called as Nuclear force.I mean it's like they didn't knew what the real cause of the stability of the nucleus was so..they just came up with a name and practically...invented a force called a Nuclear force....this still doesn't explain the stability of the nucleus???
Answer» How come the stability of the nucleus was explained by naming a force called as Nuclear force.I mean it's like they didn't knew what the real cause of the stability of the nucleus was so..they just came up with a name and practically...invented a force called a Nuclear force....this still doesn't explain the stability of the nucleus???

Discussion

47.	LiH+B2H6Ether−−−→A. A is as follows
Answer» $L i H + B_{2} H_{6} E t h e r - -- \to A .$ A is as follows

Discussion

48.	If the product of four consecutive natural numbers increased by a natural number p is a perfect square, then the value of p is
Answer» If the product of four consecutive natural numbers increased by a natural number p is a perfect square, then the value of p is

Discussion

49.	How can we find out molarity and molality of a solution?
Answer» How can we find out molarity and molality of a solution?

Discussion

50.	The crop of periplanata does not secrete any enzyme,but most of the food is digested in it. How it is possible?
Answer» The crop of periplanata does not secrete any enzyme,but most of the food is digested in it. How it is possible?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The value of Planck's constant is 6.63×10−34Js. The velocity of light is 3×108 m/s. If the wavenumber of a quantum of light is 2.5×107 m−1, calculate its frequency.

Calculate the standard internal energy change for the reaction at 25⁰C:- C2H4(g) + 3O2(g)----------à 2CO2 (g) + 2H2O (l) DH for C2H4 (g) = 52.30 kJ/mole, CO2 = - 393.5 kJ/mole H2O = - 286 kJ/mole R = 8.314 J/K/mole.

In the extraction of Iron, the function of limestone is as:

Given the following reaction at equilibrium N2(g)+3H2(g)⇌2NH3(g). Some inert gas is added at constant volume. Predict which of the following facts will be affected?

Which one of the following ores is best concentrated by froth floatation method ?

Proteins perform many physiological functions. For example, some functions as enzymes. One of the following represents an additional function that some proteins discharge (a) Antibioties (b) Pigment conferring colour to skin (c) Pigments making colours of flowers.(d) Hormons

Which transition of electron in the hydrogen atom emits maximum energy?

Following compounds are given (i) CH3 CH2 OH (ii) CH3 CO CH3 (iii) (iv) CH3 OH Which of the above compounds, on being warmed with iodine solution andNaOH , will give Iodo form?

Osmotic pressure of 0.1 M solution of NaCl and Na2SO4 will be

Iodoethane reacts with sodium in the presence of dry ether. The product is

In the following sequence, product I, J, and L are formed. K represents a reagent. The structure of the product L is:

The magnetic moment of Cr3+ is

Allyl chloride CH2=CH-CH2-Cl IUPAC NAME : 3-Chloro-1-propene Why not 1-Chloro-2-propene

For a certain reaction large fraction of molecules has energy more than the threshold energy, yet the rate of reaction is very slow. Why?

A solution contains non-volatile solute of molecular mass MP. Which of the following can be used to calculate molecular mass of the solute in terms of osmotic pressure (m = Mass of solute, V = Volume of solution and p = Osmotic pressure)

Q)What would be the board level definition of synergic effect ????? And how synergic effect strengthens the bond between metal and the carbonyl group ?????? ​​​​

Assume that the decomposition of HNO3 can be represented by the following equation 4HNO3(g)⇌4NO2(g)+2H2O(g)+O2(g) and the reaction approaches equilibrium at 400 K temperature and 30 atm pressure. At equilibrium partial pressure of HNO3 is 2 atm. Calculate Kc at 400 K : (Use R= 0.08 Latm/molK)

The solubility product of MA is 2×10−12 at 25∘C. A solution is 0.1 M in M(NO3)2 and it is saturated with 0.01 M H2A, then the minimum pH that must be maintained to start precipitation of MA is (Given: Ka1(H2A)=4×10−7;Ka2(H2A)=5×10−11)

Among the following, the number of aromatic compound(s) is

Arrange the following hydrides in increasing acidic strength.

0.1 M CH3COOH is titrated with 0.1M NaOH solution. What would be the difference in pH between 14 and 34 stages of neutralization of acid

On a ship sailing in the Pacific ocean, where the temperature is 23.4∘C, a balloon is filled with 2 L of air. What will be the volume of the balloon when the ship reaches the Indian ocean, where the temperature is 26.1∘C?

XeF6 on complete hydrolysis gives:

2,3-Dimethylbut-2-ene can be preparaed by heating which of the following compounds with a strong acid?

Which one of the following represents the electronic configuration of the most electropositive element?

Find the dissociation constant Ka of a weak monobasic acid which is 3.5% dissociated in a N10 solution at 25∘C

Ester 2eq RMgX−−−−−−→P, product P is :

What is meant exactly by interfacial separation between the atoms?

For the following reaction, C(diamond,s)+O2(g)→CO2(g);△H=−94.3 kcal C(graphite,s)+O2(g)→CO2(g);△H=−97.6 kcal The heat required to change 1 g of C(diamond,s)→C(graphite,s) is:

The molar mass of a certain gas B is double than that of A. Also the RMS velocity of gas A is 200 ms−1 at a certain temperature. RMS velocity of gas B at the temperature half of the temperature of A is:

The total vapour pressure of a 4 mole % solution of ammonia in water at 293 K is 50.0 torr; the vapour pressure of pure water is 17.0 torr at this temperature. Applying Henry's and Raoult's laws, the total vapour pressure for a 5 mole % solution is (in torr).

A dye emits 75% of the absorbed energy as fluorescence. The number of quanta absorbed and emitted out are in the ratio 2:3. Find the wavelength of the emitted radiation if the absorbed radiation has a wavelength of x oA.

Sodium hydroxide is used in

What is quanta?

Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are, respectively

The number of sp2 hybridised boron atoms in borax are

The outer electronic configuration of Gd (Atomic No:64) is:

A solution of CuSO4 is

Calculate the reasonance energy of N2O from the following data.of △Hof N2O = 82 kJ mol−1 Bond energy of N ≡ N, N = N, O = O and N = O bonds are 946, 418, 498 &amp; 607 kJ mol−1 respectively.

ΔH∘f of a hypothetical salt, MX is 150 kJmol−1 and for MX2 it is −600 kJmol−1. The enthalpy of disproportionation of MX is −100 x kJmol−1. The value of x is

Number of moles of K2Cr2O7 reduced by one mole of Sn2+ ions (in acidic medium) is:

Schiff bases are condensation products of and carbonyls compounds.

Oh! We are nearly there. You can almost smell copper. Molten Copper Matte is then transferred to a Bessemer converter where it undergoes___reduction

Find total pressure observed after opening the stopcock . [neglecting the volume of the tube connecting the two bulbs]

LiH+B2H6Ether−−−→A. A is as follows

If the product of four consecutive natural numbers increased by a natural number p is a perfect square, then the value of p is

How can we find out molarity and molality of a solution?

The crop of periplanata does not secrete any enzyme,but most of the food is digested in it. How it is possible?

Q)What would be the board level definition of synergic effect ????? And how synergic effect strengthens the bond between metal and the carbonyl group ??????

Calculate the reasonance energy of N2O from the following data.of △Hof N2O = 82 kJ mol−1 Bond energy of N ≡ N, N = N, O = O and N = O bonds are 946, 418, 498 & 607 kJ mol−1 respectively.