46295 + Interview Questions in Chemistry

1.	the correct order of basic strength 1.H2OCH3OH
Answer» the correct order of basic strength 1.H2OCH3OH

Discussion

2.	For the reaction N2(g)+O2(g)⇌2NO(g,) the equilibrium constant is K1. The equilibrium constant is K2 for the reaction 2NO(g)+O2(g)⇌2NO2(g).What is K for the reaction NO2(g)⇌12N2(g)+O2(g)?
Answer» For the reaction $N_{2} (g) + O_{2} (g) ⇌ 2 N O (g,)$ the equilibrium constant is $K_{1} .$ The equilibrium constant is $K_{2}$ for the reaction $2 N O (g) + O_{2} (g) ⇌ 2 N O_{2} (g) .$ What is $K$ for the reaction $N O_{2} (g) ⇌ \frac{1}{2} N_{2} (g) + O_{2} (g)$ ?

Discussion

3.	The element with the highest first ionisation potential is
Answer» The element with the highest first ionisation potential is

Discussion

4.	correct observation .1)0.1M urea ,2) 0.1M Nacl ,3) 0.1M cacl2 a)vapour pressure of 1 is lowest b)relative lowerimg of vapour pressure is maximum in 3 c)freezing poimt is maximum for 3 d)boilimg point is minimum for
Answer» correct observation .1)0.1M urea ,2) 0.1M Nacl ,3) 0.1M cacl2 a)vapour pressure of 1 is lowest b)relative lowerimg of vapour pressure is maximum in 3 c)freezing poimt is maximum for 3 d)boilimg point is minimum for

Discussion

5.	The first and second ionisation enthalpies (kJ/mol) of three elements A,B and c are given as A. B. C. (IE 1). 403. 549. 1142. 2640. 1040. 2080. Identify the element which is likely to be. (a) a non metal (b) an alkali metal (c) an alkaline earth metal.Also give reasons.
Answer» The first and second ionisation enthalpies (kJ/mol) of three elements A,B and c are given as A. B. C. (IE 1). 403. 549. 1142. 2640. 1040. 2080. Identify the element which is likely to be. (a) a non metal (b) an alkali metal (c) an alkaline earth metal.Also give reasons.

Discussion

6.	The weight of one litre sample of ozonized oxygen at 1 atm and 276 K was found to be 1.45 g. When 100 mL of this mixture was treated with turpentine oil the volume was reduced to 90 mL. Hence, calculate the molecular weight of ozone. (Take R=253×10−2 atmL/molK)
Answer» The weight of one litre sample of ozonized oxygen at 1 atm and 276 K was found to be 1.45 g. When 100 mL of this mixture was treated with turpentine oil the volume was reduced to 90 mL. Hence, calculate the molecular weight of ozone. $(Take R = \frac{25}{3} \times 10^{- 2} atmL/molK)$

Discussion

7.	a circular ring carries a charge Q,the variation of electric field with distance x measured from center along axis for x
Answer» a circular ring carries a charge Q,the variation of electric field with distance x measured from center along axis for x<

Discussion

8.	Which element is used in manufacturing cans, foils and kitchen utensils, pipes, and window frames?
Answer» Which element is used in manufacturing cans, foils and kitchen utensils, pipes, and window frames?

Discussion

9.	37. 2.5 F of electricity is passed through CuSO4 .The nos of gram equivalent of Cu deposited at cathode is?
Answer» 37. 2.5 F of electricity is passed through CuSO4 .The nos of gram equivalent of Cu deposited at cathode is?

Discussion

10.	Which of the following is an electrophilic addition reaction ?
Answer» Which of the following is an electrophilic addition reaction ?

Discussion

11.	26.Balance the equation Mg+HNO3=Mg(NO3)2+N2O+H2O
Answer» 26.Balance the equation Mg+HNO3=Mg(NO3)2+N2O+H2O

Discussion

12.	What is lanthanide contraction?Why does it occurs?
Answer» What is lanthanide contraction?Why does it occurs?

Discussion

13.	The best leaving group among the given options is:
Answer» The best leaving group among the given options is:

Discussion

14.	The correct order of acidic strength is
Answer» The correct order of acidic strength is

Discussion

15.	84. Which of the following elements of group 13 can react with alkali solutions to give H2 gas ?a)Boron b)Aluminiun c)Gallium d)All of these.
Answer» 84. Which of the following elements of group 13 can react with alkali solutions to give H2 gas ?a)Boron b)Aluminiun c)Gallium d)All of these.

Discussion

16.	64. Benzene and toluene forms nearly an ideal solution. At 300K P^° toluene=32.6 mm and P^° benzene=103.01 mm 1. A liquid mixture is composed of 3 mole of toluene and 2 mole of benzene. If the pressure over the mixture at 300K is reduced, at what pressure does the first vapour form? 2. What is the composition of the first trace of vapour formed? 3. If the pressure is reduced further, at what pressure does the last trace of liquid disappear? 4. What is the composition of last trace of liquid?
Answer» 64. Benzene and toluene forms nearly an ideal solution. At 300K P^° toluene=32.6 mm and P^° benzene=103.01 mm 1. A liquid mixture is composed of 3 mole of toluene and 2 mole of benzene. If the pressure over the mixture at 300K is reduced, at what pressure does the first vapour form? 2. What is the composition of the first trace of vapour formed? 3. If the pressure is reduced further, at what pressure does the last trace of liquid disappear? 4. What is the composition of last trace of liquid?

Discussion

17.	5. A hydrocarbon contains 91.3% carbon by mass. Find the empirical formula of hydrocarbon.
Answer» 5. A hydrocarbon contains 91.3% carbon by mass. Find the empirical formula of hydrocarbon.

Discussion

18.	For the given reaction,PCl5(g)⇌PCl3(g)+Cl2(g)Calculate Kp, if at equilibrium 2 moles each of PCl5, PCl3, and Cl2 is maintained at 250oC and a total pressure of 3 atm.
Answer» For the given reaction, $P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)$ Calculate $K_{p}$ , if at equilibrium $2$ moles each of $P C l_{5}, P C l_{3},$ and $C l_{2}$ is maintained at $250^{o} C$ and a total pressure of $3 atm$ .

Discussion

19.	The number of hydrogen atoms in cyclohexane are
Answer» The number of hydrogen atoms in cyclohexane are

Discussion

20.	The reduction potential of H\ast/H2(1bar)/Pt in 1M NaOH solution at 25^° C will be about(1) 0.412 V(2) 0.828 V(3) -0.414 V(4)-0.828 V
Answer» The reduction potential of H\ast/H2(1bar)/Pt in 1M NaOH solution at 25^° C will be about(1) 0.412 V(2) 0.828 V(3) -0.414 V(4)-0.828 V

Discussion

21.	Ammonia forms the complex ion [Cu(NH3)4]+2 with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it?
Answer» Ammonia forms the complex ion $[C u (N H_{3})_{4}]^{+ 2}$ with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it?

Discussion

22.	Name the part of the atom which is massive and positively charged. Write its constituents.
Answer» Name the part of the atom which is massive and positively charged. Write its constituents.

Discussion

23.	A polar and a non-polar molecule interact by:
Answer» A polar and a non-polar molecule interact by:

Discussion

24.	Rank the following compounds in order of increasing E2 reaction rate with alc KOH (A) CH2BrCH2CH2CH2CH3 (B) CH3CHBrCH2CH2CHCH2 (C) CH3CHBrCH2CHCH2
Answer» Rank the following compounds in order of increasing E2 reaction rate with alc KOH (A) CH2BrCH2CH2CH2CH3 (B) CH3CHBrCH2CH2CHCH2 (C) CH3CHBrCH2CHCH2

Discussion

25.	30.A mixture of zinc and Ag weigh 6.5g react with HCl and evolve H2 gas which react with 0.56 litre of Co2 at STP completely to form water. find percentage mass of Ag mixture?
Answer» 30.A mixture of zinc and Ag weigh 6.5g react with HCl and evolve H2 gas which react with 0.56 litre of Co2 at STP completely to form water. find percentage mass of Ag mixture?

Discussion

26.	Nitrobenzene \xrightarrow[{weakly acidic medium}]{electroreduction}niline n factor of nitrobenzene in this process
Answer» Nitrobenzene \xrightarrow[{weakly acidic medium}]{electroreduction}niline n factor of nitrobenzene in this process

Discussion

27.	The nucleus of an atom can be assumed to be spherical. The radius of the nucleus of mass number A is given by 1.25×10−13×A13 Radius of atom is one A . If the mass number is 64, then the fraction of the atomic volume that is occupied by the nucleus is
Answer» The nucleus of an atom can be assumed to be spherical. The radius of the nucleus of mass number A is given by $1.25 \times 10^{- 13} \times A^{\frac{1}{3}}$ Radius of atom is one A . If the mass number is 64, then the fraction of the atomic volume that is occupied by the nucleus is

27.

The nucleus of an atom can be assumed to be spherical. The radius of the nucleus of mass number A is given by 1.25×10−13×A13 Radius of atom is one A . If the mass number is 64, then the fraction of the atomic volume that is occupied by the nucleus is

Answer»

The nucleus of an atom can be assumed to be spherical. The radius of the nucleus of mass number A is given by $1.25 \times 10^{- 13} \times A^{\frac{1}{3}}$ Radius of atom is one A . If the mass number is 64, then the fraction of the atomic volume that is occupied by the nucleus is

Discussion

28.	6 In an atom, which has 2K, 8L, 18M and 2N electrons in the ground state. The total number of electrons having magnetic quantum number, m = 0 is (1) 6 (2) 10 (3) 7 (4) 14
Answer» 6 In an atom, which has 2K, 8L, 18M and 2N electrons in the ground state. The total number of electrons having magnetic quantum number, m = 0 is (1) 6 (2) 10 (3) 7 (4) 14

Discussion

29.	56. 20 ml of CO is exploded with excess of O_2 at constant pressure and temperature. Find volume of the gases in ml will be
Answer» 56. 20 ml of CO is exploded with excess of O_2 at constant pressure and temperature. Find volume of the gases in ml will be

Discussion

30.	The radioactive decay, 83Bi211→81Tl207 , takes place in 10L closed container at 0∘C. Half - life of 83Bi211 is 2.15 min. Starting with 1 mole of 83Bi211, the pressure developed in the container after 4.30min. will be
Answer» The radioactive decay, $_{83} B i^{211} \to_{81} T l^{207}$ , takes place in 10L closed container at $0^{\circ} C$ . Half - life of $_{83} B i^{211}$ is 2.15 min. Starting with 1 mole of $_{83} B i^{211}$ , the pressure developed in the container after 4.30min. will be

Discussion

31.	Total number of ions in aquous solution of sodium sulphate is
Answer» Total number of ions in aquous solution of sodium sulphate is

Discussion

32.	The solubility of Mg(OH)2 in a particular buffer is found to be 0.95 gL−1. What is the pH of the buffer solution? [Ksp(Mg(OH)2)=1.8×10−11]
Answer» The solubility of $M g (O H)_{2}$ in a particular buffer is found to be $0.95 g L^{- 1} .$ What is the pH of the buffer solution? $[K_{s p} (M g (O H)_{2}) = 1.8 \times 10^{- 11}]$

Discussion

33.	In areaction, 2A →Products, the concentration of A decreases from 0.5 mol L−1to 0.4 mol L−1in 10 minutes. Calculate the rate during this interval?
Answer» In a reaction, 2A → Products, the concentration of A decreases from 0.5 mol L⁻¹ to 0.4 mol L⁻¹ in 10 minutes. Calculate the rate during this interval?

Discussion

34.	Which has more dipole CClH3 or CHCl3 and why?
Answer» Which has more dipole CClH3 or CHCl3 and why?

Discussion

35.	1 mol of KClO3 is thermally decomposed and excess of aluminium is burnt in the gaseous product.How many moles of aluminium oxide are formed?
Answer» 1 mol of KClO3 is thermally decomposed and excess of aluminium is burnt in the gaseous product.How many moles of aluminium oxide are formed?

Discussion

36.	in which cases Na/C2H5OH can be used as a reducing agent?
Answer» in which cases Na/C2H5OH can be used as a reducing agent?

Discussion

37.	23892U is known to undergo radioactive decay to form 20682Pb by emitting alpha and beta particles. A rock initially contained 68×10−6 g of 23892U. If the number of alpha particles that it would emit during its radioactive decay of 23892U→20682Pb in three half-lives is Z×1018, then what is the value of Z?
Answer» $_{92}^{238} U$ is known to undergo radioactive decay to form $_{82}^{206} P b$ by emitting alpha and beta particles. A rock initially contained $68 \times 10^{- 6} g$ of $_{92}^{238} U .$ If the number of alpha particles that it would emit during its radioactive decay of $_{92}^{238} U \to_{82}^{206} Pb$ in three half-lives is $Z \times 10^{18}$ , then what is the value of $Z$ ?

Discussion

38.	Out of aldehydes and ketones which one is more reactive and why?
Answer» Out of aldehydes and ketones which one is more reactive and why?

Discussion

39.	which of the following is insoluble in dilute HCl (1)CdCl2 (2)PbCl2 (3)BiOCl (4)SbCl
Answer» which of the following is insoluble in dilute HCl (1)CdCl2 (2)PbCl2 (3)BiOCl (4)SbCl

Discussion

40.	0.9031 g of mixture of NaCl and kCl on treatement with H2SO4 gave 1.0784 g of a mixture of Na2SO4 & k2SO4. Calculate the % composition of the original mixture
Answer» 0.9031 g of mixture of NaCl and kCl on treatement with H2SO4 gave 1.0784 g of a mixture of Na2SO4 & k2SO4. Calculate the % composition of the original mixture

Discussion

41.	How many particles per atoms are present in hexagonal unit cell?
Answer» How many particles per atoms are present in hexagonal unit cell?

Discussion

42.	17. Assertion:- Fehling's solution can be used to distinguish benzaldehyde from acetaldehyde Reason:- The C-H bond of CHO group in benzaldehyde is stronger than C-Hbond of CHO group in acetaldehyde
Answer» 17. Assertion:- Fehling's solution can be used to distinguish benzaldehyde from acetaldehyde Reason:- The C-H bond of CHO group in benzaldehyde is stronger than C-Hbond of CHO group in acetaldehyde

Discussion

43.	Why dipole moment of Mecl>than Mef
Answer» Why dipole moment of Mecl>than Mef

Discussion

44.	ntThe heat liberated when 1.89 gram of benzoic acid is burnt in a Bomb calorimeter at 25 degree Celsius increases the temperature of 18.94 kilogram of water by 0.632 degree Celsius if the specific heat of water at 25 degree centigrade is 0.998 calorie per gram degree. What is the value of heat of combustion of benzoic acid??n
Answer» ntThe heat liberated when 1.89 gram of benzoic acid is burnt in a Bomb calorimeter at 25 degree Celsius increases the temperature of 18.94 kilogram of water by 0.632 degree Celsius if the specific heat of water at 25 degree centigrade is 0.998 calorie per gram degree. What is the value of heat of combustion of benzoic acid??n

Discussion

45.	The coordination number for a close packing in 1-D lattice is :
Answer» The coordination number for a close packing in 1-D lattice is :

Discussion

46.	What will be the relationship between r and a in FCC?
Answer» What will be the relationship between r and a in FCC?

Discussion

47.	Write the structures of the following organic halogen compounds.(i)2-Chloro-3-methylpentane(ii)p-Bromochlorobenzene(iii)1-Chloro-4-ethylcyclohexane(iv)2-(2-Chlorophenyl)-1-iodooctane(v) Perfluorobenzene (vi)4-tert-Butyl-3-iodoheptane(vii)1-Bromo-4-sec-butyl-2-methylbenzene(viii)1,4-Dibromobut-2-ene
Answer» Write the structures of the following organic halogen compounds. (i)2-Chloro-3-methylpentane (ii)p-Bromochlorobenzene (iii)1-Chloro-4-ethylcyclohexane (iv)2-(2-Chlorophenyl)-1-iodooctane (v) Perfluorobenzene (vi)4-tert-Butyl-3-iodoheptane (vii)1-Bromo-4-sec-butyl-2-methylbenzene (viii)1,4-Dibromobut-2-ene

47.

Write the structures of the following organic halogen compounds.(i)2-Chloro-3-methylpentane(ii)p-Bromochlorobenzene(iii)1-Chloro-4-ethylcyclohexane(iv)2-(2-Chlorophenyl)-1-iodooctane(v) Perfluorobenzene (vi)4-tert-Butyl-3-iodoheptane(vii)1-Bromo-4-sec-butyl-2-methylbenzene(viii)1,4-Dibromobut-2-ene

Answer»

Write the structures of the following organic halogen compounds.

(i)2-Chloro-3-methylpentane

(ii)p-Bromochlorobenzene

(iii)1-Chloro-4-ethylcyclohexane

(iv)2-(2-Chlorophenyl)-1-iodooctane

(v) Perfluorobenzene

(vi)4-tert-Butyl-3-iodoheptane

(vii)1-Bromo-4-sec-butyl-2-methylbenzene

(viii)1,4-Dibromobut-2-ene

Discussion

48.	Write down the reactions involved during the formation of photochemical smog.
Answer» Write down the reactions involved during the formation of photochemical smog.

Discussion

49.	Identify A in the following chemical reaction.
Answer» Identify A in the following chemical reaction.

49.

Identify A in the following chemical reaction.

Answer»

Identify A in the following chemical reaction.

Discussion

50.	In which of the following pairs both the species have sp3 hybridization?
Answer» In which of the following pairs both the species have $s p^{3}$ hybridization?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

the correct order of basic strength 1.H2OCH3OH

For the reaction N2(g)+O2(g)⇌2NO(g,) the equilibrium constant is K1. The equilibrium constant is K2 for the reaction 2NO(g)+O2(g)⇌2NO2(g).What is K for the reaction NO2(g)⇌12N2(g)+O2(g)?

The element with the highest first ionisation potential is

correct observation .1)0.1M urea ,2) 0.1M Nacl ,3) 0.1M cacl2 a)vapour pressure of 1 is lowest b)relative lowerimg of vapour pressure is maximum in 3 c)freezing poimt is maximum for 3 d)boilimg point is minimum for

The first and second ionisation enthalpies (kJ/mol) of three elements A,B and c are given as A. B. C. (IE 1). 403. 549. 1142. 2640. 1040. 2080. Identify the element which is likely to be. (a) a non metal (b) an alkali metal (c) an alkaline earth metal.Also give reasons.

The weight of one litre sample of ozonized oxygen at 1 atm and 276 K was found to be 1.45 g. When 100 mL of this mixture was treated with turpentine oil the volume was reduced to 90 mL. Hence, calculate the molecular weight of ozone. (Take R=253×10−2 atmL/molK)

a circular ring carries a charge Q,the variation of electric field with distance x measured from center along axis for x

Which element is used in manufacturing cans, foils and kitchen utensils, pipes, and window frames?

37. 2.5 F of electricity is passed through CuSO4 .The nos of gram equivalent of Cu deposited at cathode is?

Which of the following is an electrophilic addition reaction ?

26.Balance the equation Mg+HNO3=Mg(NO3)2+N2O+H2O

What is lanthanide contraction?Why does it occurs?

The best leaving group among the given options is:

The correct order of acidic strength is

84. Which of the following elements of group 13 can react with alkali solutions to give H2 gas ?a)Boron b)Aluminiun c)Gallium d)All of these.

5. A hydrocarbon contains 91.3% carbon by mass. Find the empirical formula of hydrocarbon.

For the given reaction,PCl5(g)⇌PCl3(g)+Cl2(g)Calculate Kp, if at equilibrium 2 moles each of PCl5, PCl3, and Cl2 is maintained at 250oC and a total pressure of 3 atm.

The number of hydrogen atoms in cyclohexane are

The reduction potential of H\ast/H2(1bar)/Pt in 1M NaOH solution at 25^° C will be about(1) 0.412 V(2) 0.828 V(3) -0.414 V(4)-0.828 V

Ammonia forms the complex ion [Cu(NH3)4]+2 with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it?

Name the part of the atom which is massive and positively charged. Write its constituents.

A polar and a non-polar molecule interact by:

Rank the following compounds in order of increasing E2 reaction rate with alc KOH (A) CH2BrCH2CH2CH2CH3 (B) CH3CHBrCH2CH2CHCH2 (C) CH3CHBrCH2CHCH2

30.A mixture of zinc and Ag weigh 6.5g react with HCl and evolve H2 gas which react with 0.56 litre of Co2 at STP completely to form water. find percentage mass of Ag mixture?

Nitrobenzene \xrightarrow[{weakly acidic medium}]{electroreduction}niline n factor of nitrobenzene in this process

The nucleus of an atom can be assumed to be spherical. The radius of the nucleus of mass number A is given by 1.25×10−13×A13 Radius of atom is one A . If the mass number is 64, then the fraction of the atomic volume that is occupied by the nucleus is

6 In an atom, which has 2K, 8L, 18M and 2N electrons in the ground state. The total number of electrons having magnetic quantum number, m = 0 is (1) 6 (2) 10 (3) 7 (4) 14

56. 20 ml of CO is exploded with excess of O_2 at constant pressure and temperature. Find volume of the gases in ml will be

The radioactive decay, 83Bi211→81Tl207 , takes place in 10L closed container at 0∘C. Half - life of 83Bi211 is 2.15 min. Starting with 1 mole of 83Bi211, the pressure developed in the container after 4.30min. will be

Total number of ions in aquous solution of sodium sulphate is

The solubility of Mg(OH)2 in a particular buffer is found to be 0.95 gL−1. What is the pH of the buffer solution? [Ksp(Mg(OH)2)=1.8×10−11]

In areaction, 2A →Products, the concentration of A decreases from 0.5 mol L−1to 0.4 mol L−1in 10 minutes. Calculate the rate during this interval?

Which has more dipole CClH3 or CHCl3 and why?

1 mol of KClO3 is thermally decomposed and excess of aluminium is burnt in the gaseous product.How many moles of aluminium oxide are formed?

in which cases Na/C2H5OH can be used as a reducing agent?

Out of aldehydes and ketones which one is more reactive and why?

which of the following is insoluble in dilute HCl (1)CdCl2 (2)PbCl2 (3)BiOCl (4)SbCl

0.9031 g of mixture of NaCl and kCl on treatement with H2SO4 gave 1.0784 g of a mixture of Na2SO4 & k2SO4. Calculate the % composition of the original mixture

How many particles per atoms are present in hexagonal unit cell?

17. Assertion:- Fehling's solution can be used to distinguish benzaldehyde from acetaldehyde Reason:- The C-H bond of CHO group in benzaldehyde is stronger than C-Hbond of CHO group in acetaldehyde

Why dipole moment of Mecl>than Mef

The coordination number for a close packing in 1-D lattice is :

What will be the relationship between r and a in FCC?

Write the structures of the following organic halogen compounds.(i)2-Chloro-3-methylpentane(ii)p-Bromochlorobenzene(iii)1-Chloro-4-ethylcyclohexane(iv)2-(2-Chlorophenyl)-1-iodooctane(v) Perfluorobenzene (vi)4-tert-Butyl-3-iodoheptane(vii)1-Bromo-4-sec-butyl-2-methylbenzene(viii)1,4-Dibromobut-2-ene

Write down the reactions involved during the formation of photochemical smog.

Identify A in the following chemical reaction.

In which of the following pairs both the species have sp3 hybridization?