46295 + Interview Questions in Chemistry

1.	46. How does acetophenone react with Naoh
Answer» 46. How does acetophenone react with Naoh

Discussion

2.	The density of 3 molar solution of NaCl is 1.25gperml .Find out its motality
Answer» The density of 3 molar solution of NaCl is 1.25gperml .Find out its motality

Discussion

3.	Which is small between Li+1 and Al+3 and why
Answer» Which is small between Li+1 and Al+3 and why

Discussion

4.	63 Why keto form is more stable than enol form. Explain in detail.
Answer» 63 Why keto form is more stable than enol form. Explain in detail.

Discussion

5.	48. A sequence of reactions is shown below starting from an optically active compound P. P does not react with 2,4-dinitrophenylhydrazine (2,4-DNP) to form a hydrazone. Q reacts very rapidly with one molar equivalent of ethylamine at low temperature to form R. Select the most appropriate statement(s). (A) Q as well as R are optically active. (B) Q on heating with an excess of ethylamine in the presence of a base gives a basic compound. (C) R is a basic compound and can react with an acid to form a salt. (D) An optically inactive isomer of P on heating can form compound S (C4H6O2) which does not react with thionyl chloride.
Answer» 48. A sequence of reactions is shown below starting from an optically active compound P. P does not react with 2,4-dinitrophenylhydrazine (2,4-DNP) to form a hydrazone. Q reacts very rapidly with one molar equivalent of ethylamine at low temperature to form R. Select the most appropriate statement(s). (A) Q as well as R are optically active. (B) Q on heating with an excess of ethylamine in the presence of a base gives a basic compound. (C) R is a basic compound and can react with an acid to form a salt. (D) An optically inactive isomer of P on heating can form compound S (C4H6O2) which does not react with thionyl chloride.

Discussion

6.	Air is streaming past a horizontal airplane wing such that its speed is 120 m/s over the upper surface and 90 m/s at the lower surface. If the density of the air is 1.3 kg/m3 and the wing is 10 m long and has an average width of 2 m, then the difference of pressure on the two sides of the wing is
Answer» Air is streaming past a horizontal airplane wing such that its speed is 120 m/s over the upper surface and 90 m/s at the lower surface. If the density of the air is 1.3 kg/m³ and the wing is 10 m long and has an average width of 2 m, then the difference of pressure on the two sides of the wing is

Discussion

7.	the percentage by weight of methanol in a mixture of methanol and ethanol is 50 percent. therefore, the mole fraction of methanol in the mixture is
Answer» the percentage by weight of methanol in a mixture of methanol and ethanol is 50 percent. therefore, the mole fraction of methanol in the mixture is

Discussion

8.	iaryWhich of the following is not an allylic halide?la) 4-Bromopent-2-eneb)3-Bromo-2-methylbut-1-eneIc) 1-Bromobut-2-ene(d) 4-Bromobut-1-eneHaloalkanes contain halogen atom(s) attached11
Answer» iaryWhich of the following is not an allylic halide?la) 4-Bromopent-2-eneb)3-Bromo-2-methylbut-1-eneIc) 1-Bromobut-2-ene(d) 4-Bromobut-1-eneHaloalkanes contain halogen atom(s) attached11

Discussion

9.	Q. A Carnot engine has an efficiency of 1/6.When the temperature of the sink is reduced by 62^° C, its efficiency is doubled.The temperatures of the source and the sink are, respectively,Options 1. 124^° C, 62^° C 2. 99^° C, 37^° C 3. 37^° C, 99^° C 4. 62^° C, 124^° C
Answer» Q. A Carnot engine has an efficiency of 1/6.When the temperature of the sink is reduced by 62^° C, its efficiency is doubled.The temperatures of the source and the sink are, respectively,Options 1. 124^° C, 62^° C 2. 99^° C, 37^° C 3. 37^° C, 99^° C 4. 62^° C, 124^° C

Discussion

10.	For a first order reaction, the time required for 99.9% of the reaction to take place is n times the time required for half of the reaction to take place.What is the value of n to the nearest integer?(Take log102=0.3)
Answer» For a first order reaction, the time required for $99.9 %$ of the reaction to take place is $n$ times the time required for half of the reaction to take place. What is the value of $n$ to the nearest integer? (Take $l o g_{10} 2 = 0.3$ )

Discussion

11.	In the reaction given below, the major product formed is?
Answer» In the reaction given below, the major product formed is?

Discussion

12.	KMnO4 on heating gives:
Answer» $K M n O_{4}$ on heating gives:

Discussion

13.	The equilibrium constant Kc for the gaseous phase reaction at 523 K: PCl3+Cl2⇌PCl5 is 23.10 L mol−1. Calculate Kp at 503 K
Answer» The equilibrium constant $K_{c}$ for the gaseous phase reaction at $523 K$ : $P C l_{3} + C l_{2} ⇌ P C l_{5}$ is $23.10 {L mol}^{- 1}$ . Calculate $K_{p}$ at $503 K$

Discussion

14.	Deuterium used as moderator in nuclear reactor and tracers. What are moderators and tracers?
Answer» Deuterium used as moderator in nuclear reactor and tracers. What are moderators and tracers?

Discussion

15.	The depletion of ozone layer is a cause of concern. Why?
Answer» The depletion of ozone layer is a cause of concern. Why?

Discussion

16.	Name the most common type of silk and its characteristics.
Answer» Name the most common type of silk and its characteristics.

Discussion

17.	55. A hydrocarbon contains 91.3% carbon by mass.find the empirical formula of hydrocarbon.
Answer» 55. A hydrocarbon contains 91.3% carbon by mass.find the empirical formula of hydrocarbon.

Discussion

18.	What is the difference between permutation and combination?
Answer» What is the difference between permutation and combination?

Discussion

19.	Calculate the energy required for the process He+(g)→He2+(g)+e− The ionization energy for the H atom in the ground state is 2.18 ×10–18Jatom–1
Answer» Calculate the energy required for the process $H e_{(g)}^{+} \to H e_{(g)}^{2 +} + e^{-}$ The ionization energy for the H atom in the ground state is 2.18 × $10^{- 18} J a t o m^{- 1}$

Discussion

20.	The volume of 0.05N Na2CO3, solution required to neutralise 200ml of 0.02M H2SO4solution is1) 80ml3) 160ml2) 140ml4) 240ml
Answer» The volume of 0.05N Na2CO3, solution required to neutralise 200ml of 0.02M H2SO4solution is1) 80ml3) 160ml2) 140ml4) 240ml

Discussion

21.	calculate the pressure of gas whose molar mass is 29.3 gram per mole having density 1.29 ki\log ram per metre cube at 273 Kelvin temperature
Answer» calculate the pressure of gas whose molar mass is 29.3 gram per mole having density 1.29 ki\log ram per metre cube at 273 Kelvin temperature

Discussion

22.	Which of the following will have sp2 hybridisation?
Answer» Which of the following will have $s p^{2}$ hybridisation?

Discussion

23.	Can MERCURY conduct electricity ??And if yes , then how ??
Answer» Can MERCURY conduct electricity ?? And if yes , then how ??

Discussion

24.	Calculate the wavelength associated with an electron moving with a velocity of 109 cm/s.
Answer» Calculate the wavelength associated with an electron moving with a velocity of $10^{9} c m / s .$

Discussion

25.	Iupac name of Gammexene?Is it Gammexene or Gammexene?
Answer» Iupac name of Gammexene? Is it Gammexene or Gammexene?

Discussion

26.	Consider the following transformation [Co(H2O)x]3+ (Pink complex) Excess HCl−−−−−−→[CoCly]n− (Blue complex). Find the value of expression x+yn.
Answer» Consider the following transformation ${[C o (H_{2} O)_{x}]}_{2}^{3 +}$ (Pink complex) $Excess HCl - ----- \to {[C o C l_{y}]}_{y}^{n -}$ (Blue complex). Find the value of expression $\frac{x + y}{n}$ .

Discussion

27.	Theory of mediating particles
Answer» Theory of mediating particles

Discussion

28.	benzene is oxidised by H202 in the presence of FeSO4 t
Answer» benzene is oxidised by H202 in the presence of FeSO4 t

Discussion

29.	79. In the reaction 2A3B, at t = 0 starting with only A, the extent of reaction when the concentration of A and B are equal is
Answer» 79. In the reaction 2A3B, at t = 0 starting with only A, the extent of reaction when the concentration of A and B are equal is

Discussion

30.	At 25∘C, the dissociation constant of a base BOH is 1.0 × 10−12. The concentration of Hydroxyl ions in 0.01 M aqueous solution of the base would be
Answer» At $25^{\circ} C$ , the dissociation constant of a base BOH is $1.0 \times 10^{- 12}$ . The concentration of Hydroxyl ions in 0.01 M aqueous solution of the base would be

30.

At 25∘C, the dissociation constant of a base BOH is 1.0 × 10−12. The concentration of Hydroxyl ions in 0.01 M aqueous solution of the base would be

Answer»

At $25^{\circ} C$ , the dissociation constant of a base BOH is $1.0 \times 10^{- 12}$ . The

concentration of Hydroxyl ions in 0.01 M aqueous solution of the base

would be

Discussion

31.	Trans-alkenes are formed by the reduction of alkynes with:
Answer» Trans-alkenes are formed by the reduction of alkynes with:

Discussion

32.	Which has a maximum Boiling point - propanal or acetone?? And how??
Answer» Which has a maximum Boiling point - propanal or acetone?? And how??

Discussion

33.	49. A solution containing 10 g per dm³ of urea (molecular mass=60g/mol) is isotonic with 5% solution of a Jon volatile solute. The molecular mass of this non-volatile solute is ??
Answer» 49. A solution containing 10 g per dm³ of urea (molecular mass=60g/mol) is isotonic with 5% solution of a Jon volatile solute. The molecular mass of this non-volatile solute is ??

Discussion

34.	mass of naoh solution required (50% w/w ) to neutralize 2 litre of 1M h2so4 solution
Answer» mass of naoh solution required (50% w/w ) to neutralize 2 litre of 1M h2so4 solution

Discussion

35.	explain by the process of oxidation number why rusting of iron is redox reaction with eqn
Answer» explain by the process of oxidation number why rusting of iron is redox reaction with eqn

Discussion

36.	21. For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of M/10 sulphuric acid. The unreacted acid required 20 mL of M /10 sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is (1) 6% (2) 10% (3) 3% (4) 5%
Answer» 21. For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of M/10 sulphuric acid. The unreacted acid required 20 mL of M /10 sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is (1) 6% (2) 10% (3) 3% (4) 5%

Discussion

37.	Correct order of electronegativity for the given elements is:
Answer» Correct order of electronegativity for the given elements is:

Discussion

38.	the difference between total no. of hyd_{}rogen atoms in78g of ethyne and 168 g of baking soda is: (a)2N_A (b)3N_A (c)6N_A (d)4N_{
Answer» the difference between total no. of hyd_{}rogen atoms in78g of ethyne and 168 g of baking soda is: (a)2N_A (b)3N_A (c)6N_A (d)4N_{

Discussion

39.	Highest bond energy exists for
Answer» Highest bond energy exists for

Discussion

40.	Calculate molarity of the resulting mixture, when 0.1 N of 100 ml H2SO4 is mixed with 0.2 N of 100 ml of NaOH solution:
Answer» Calculate molarity of the resulting mixture, when 0.1 N of 100 ml $H_{2} S O_{4}$ is mixed with 0.2 N of 100 ml of NaOH solution:

Discussion

41.	Write the major monohalo product(s) in each of the following reactions:
Answer» Write the major monohalo product(s) in each of the following reactions:

Discussion

42.	Oxidation number of nitrogen "N" in N2H+5 is :
Answer» Oxidation number of nitrogen " $N$ " in $N_{2} H_{5}^{+}$ is :

Discussion

43.	Which of the following electronic transitions in a hydrogen atom is accompanied with the emission of a radiation that has the least wavelength?
Answer» Which of the following electronic transitions in a hydrogen atom is accompanied with the emission of a radiation that has the least wavelength?

Discussion

44.	Thepressure of 2 moles of ammonia at 270 when its volume is 5 Laccording to van der WaaL's equation is (Given, α=4.17,b=0.03711)
Answer» The pressure of 2 moles of ammonia at 27⁰ when its volume is 5 L according to van der WaaL's equation is (Given, α=4.17, b=0.03711)

Discussion

45.	A beam of helium atoms moves with a velocity^{} of 2 ×10^{4 }m/s. Find the wavelength of particles constituting with the beam
Answer» A beam of helium atoms moves with a velocity^{} of 2 ×10^{4 }m/s. Find the wavelength of particles constituting with the beam

Discussion

46.	A solution contains Na2CO3 and NaHCO3. 10 mL of this solution required 2.5 mL of 0.1 MH2SO4 for neutralization using phenolphthalein as an indicator. Methyl orange is then added when a further 2.5 mL of 0.2 M H2SO4 was required. The amount of Na2CO3 and NaHCO3 respectively, in 1 litre of solution is:
Answer» A solution contains $N a_{2} C O_{3}$ and $N a H C O_{3}$ . $10 mL$ of this solution required $2.5 mL$ of $0.1 M H_{2} S O_{4}$ for neutralization using phenolphthalein as an indicator. Methyl orange is then added when a further $2.5 mL$ of $0.2 M H_{2} S O_{4}$ was required. The amount of $N a_{2} C O_{3}$ and $N a H C O_{3}$ respectively, in 1 litre of solution is:

Discussion

47.	Why cine product is major product in case of Benzyne mechanism?
Answer» Why cine product is major product in case of Benzyne mechanism?

Discussion

48.	The enthalpy of formation of ethane, ethylene and benzene from the gaseous atoms are -2839.2, -2275.2 andrespectively. Calculate the resonance energy of benzene. The bond enthalpy ofbond is given as equal to +410.87 kJ/mol.
Answer» The enthalpy of formation of ethane, ethylene and benzene from the gaseous atoms are -2839.2, -2275.2 and respectively. Calculate the resonance energy of benzene. The bond enthalpy of bond is given as equal to +410.87 kJ/mol.

Discussion

49.	Choose the correct −I effect order for halogens when attached to a carbon chain:
Answer» Choose the correct $- I$ effect order for halogens when attached to a carbon chain:

Discussion

50.	How to find that SnCl_2 has a vacant d orbital
Answer» How to find that SnCl_2 has a vacant d orbital

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

46. How does acetophenone react with Naoh

The density of 3 molar solution of NaCl is 1.25gperml .Find out its motality

Which is small between Li+1 and Al+3 and why

63 Why keto form is more stable than enol form. Explain in detail.

Air is streaming past a horizontal airplane wing such that its speed is 120 m/s over the upper surface and 90 m/s at the lower surface. If the density of the air is 1.3 kg/m3 and the wing is 10 m long and has an average width of 2 m, then the difference of pressure on the two sides of the wing is

the percentage by weight of methanol in a mixture of methanol and ethanol is 50 percent. therefore, the mole fraction of methanol in the mixture is

iaryWhich of the following is not an allylic halide?la) 4-Bromopent-2-eneb)3-Bromo-2-methylbut-1-eneIc) 1-Bromobut-2-ene(d) 4-Bromobut-1-eneHaloalkanes contain halogen atom(s) attached11

Q. A Carnot engine has an efficiency of 1/6.When the temperature of the sink is reduced by 62^° C, its efficiency is doubled.The temperatures of the source and the sink are, respectively,Options 1. 124^° C, 62^° C 2. 99^° C, 37^° C 3. 37^° C, 99^° C 4. 62^° C, 124^° C

For a first order reaction, the time required for 99.9% of the reaction to take place is n times the time required for half of the reaction to take place.What is the value of n to the nearest integer?(Take log102=0.3)

In the reaction given below, the major product formed is?

KMnO4 on heating gives:

The equilibrium constant Kc for the gaseous phase reaction at 523 K: PCl3+Cl2⇌PCl5 is 23.10 L mol−1. Calculate Kp at 503 K

Deuterium used as moderator in nuclear reactor and tracers. What are moderators and tracers?

The depletion of ozone layer is a cause of concern. Why?

Name the most common type of silk and its characteristics.

55. A hydrocarbon contains 91.3% carbon by mass.find the empirical formula of hydrocarbon.

What is the difference between permutation and combination?

Calculate the energy required for the process He+(g)→He2+(g)+e− The ionization energy for the H atom in the ground state is 2.18 ×10–18Jatom–1

The volume of 0.05N Na2CO3, solution required to neutralise 200ml of 0.02M H2SO4solution is1) 80ml3) 160ml2) 140ml4) 240ml

calculate the pressure of gas whose molar mass is 29.3 gram per mole having density 1.29 ki\log ram per metre cube at 273 Kelvin temperature

Which of the following will have sp2 hybridisation?

Can MERCURY conduct electricity ??And if yes , then how ??

Calculate the wavelength associated with an electron moving with a velocity of 109 cm/s.

Iupac name of Gammexene?Is it Gammexene or Gammexene?

Consider the following transformation [Co(H2O)x]3+ (Pink complex) Excess HCl−−−−−−→[CoCly]n− (Blue complex). Find the value of expression x+yn.

Theory of mediating particles

benzene is oxidised by H202 in the presence of FeSO4 t

79. In the reaction 2A3B, at t = 0 starting with only A, the extent of reaction when the concentration of A and B are equal is

At 25∘C, the dissociation constant of a base BOH is 1.0 × 10−12. The concentration of Hydroxyl ions in 0.01 M aqueous solution of the base would be

Trans-alkenes are formed by the reduction of alkynes with:

Which has a maximum Boiling point - propanal or acetone?? And how??

49. A solution containing 10 g per dm³ of urea (molecular mass=60g/mol) is isotonic with 5% solution of a Jon volatile solute. The molecular mass of this non-volatile solute is ??

mass of naoh solution required (50% w/w ) to neutralize 2 litre of 1M h2so4 solution

explain by the process of oxidation number why rusting of iron is redox reaction with eqn

Correct order of electronegativity for the given elements is:

the difference between total no. of hyd_{}rogen atoms in78g of ethyne and 168 g of baking soda is: (a)2N_A (b)3N_A (c)6N_A (d)4N_{

Highest bond energy exists for

Calculate molarity of the resulting mixture, when 0.1 N of 100 ml H2SO4 is mixed with 0.2 N of 100 ml of NaOH solution:

Write the major monohalo product(s) in each of the following reactions:

Oxidation number of nitrogen "N" in N2H+5​ is :

Which of the following electronic transitions in a hydrogen atom is accompanied with the emission of a radiation that has the least wavelength?

Thepressure of 2 moles of ammonia at 270 when its volume is 5 Laccording to van der WaaL's equation is (Given, α=4.17,b=0.03711)

A beam of helium atoms moves with a velocity^{} of 2 ×10^{4 }m/s. Find the wavelength of particles constituting with the beam

Why cine product is major product in case of Benzyne mechanism?

The enthalpy of formation of ethane, ethylene and benzene from the gaseous atoms are -2839.2, -2275.2 andrespectively. Calculate the resonance energy of benzene. The bond enthalpy ofbond is given as equal to +410.87 kJ/mol.

Choose the correct −I effect order for halogens when attached to a carbon chain:

How to find that SnCl_2 has a vacant d orbital

Oxidation number of nitrogen "N" in N2H+5 is :