46295 + Interview Questions in Chemistry

1.	On treating a mixture of two alkyl halides with sodium metal in dry ether, 2−methyl propane was obtained as one of the products. The alkyl halides are:
Answer» On treating a mixture of two alkyl halides with sodium metal in dry ether, $2 - methyl propane$ was obtained as one of the products. The alkyl halides are:

Discussion

2.	The molar conductance of NH4OH at 0.01M concentration is 11.3 ohm−1 cm2 mol−1. The degree of dissociationof NH4OH is(molar conductance at infinite dilution is 271.1)
Answer» The molar conductance of $N H_{4} O H$ at 0.01M concentration is 11.3 $o h m^{- 1} c m^{2} m o l^{- 1}$ . The degree of dissociation of $N H_{4} O H$ is (molar conductance at infinite dilution is 271.1)

Discussion

3.	How many neutrons and protons are there in the following nuclei? 136C ,168O ,2412Mg ,5626Fe ,8838Sr
Answer» How many neutrons and protons are there in the following nuclei? $_{6}^{13} C,_{8}^{16} O,_{12}^{24} Mg,_{26}^{56} Fe,_{38}^{88} Sr$

Discussion

4.	In which of the following reaction isalmost completed:-(1) K= 10^-1(2) K=1(3) K=10^3(4) K=10^-2
Answer» In which of the following reaction isalmost completed:- (1) K= 10^-1 (2) K=1 (3) K=10^3 (4) K=10^-2

Discussion

5.	Benzene diazonium chloride on reaction with phenol in weakly basic medium gives?Diphenyl etherp-Hydroxy azobenzeneChlorobenzeneBenzene
Answer» Benzene diazonium chloride on reaction with phenol in weakly basic medium gives? Diphenyl ether p-Hydroxy azobenzene Chlorobenzene Benzene

5.

Benzene diazonium chloride on reaction with phenol in weakly basic medium gives?Diphenyl etherp-Hydroxy azobenzeneChlorobenzeneBenzene

Answer»

Benzene diazonium chloride on reaction with phenol in weakly basic medium gives?

Diphenyl ether
p-Hydroxy azobenzene
Chlorobenzene
Benzene

Discussion

6.	Why phosphorus is termed as a typical element?
Answer» Why phosphorus is termed as a typical element?

Discussion

7.	Which of the following compounds will dissolve in an alkali solution after it has undergone reaction with Hinsberg reagent?
Answer» Which of the following compounds will dissolve in an alkali solution after it has undergone reaction with Hinsberg reagent?

Discussion

8.	Which of the following undergoes nucleophilic substitution exclusivelyby SN1 mechanism?
Answer» Which of the following undergoes nucleophilic substitution exclusivelyby S_N1 mechanism?

Discussion

9.	Which of the following pairs of compounds is isoelectric and isostructural?
Answer» Which of the following pairs of compounds is isoelectric and isostructural?

Discussion

10.	Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, E+ (a) Chlorobenzene, 2,4-dinitrochlorobenzene, p-nitrochlorobenzene (b) Toluene, p-H3C–C6H4–NO2, p-O2N–C6H4–NO2.
Answer» Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, E⁺ (a) Chlorobenzene, 2,4-dinitrochlorobenzene, p-nitrochlorobenzene (b) Toluene, p-H₃C–C₆H₄–NO₂, p-O₂N–C₆H₄–NO₂.

10.

Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, E+ (a) Chlorobenzene, 2,4-dinitrochlorobenzene, p-nitrochlorobenzene (b) Toluene, p-H3C–C6H4–NO2, p-O2N–C6H4–NO2.

Answer»

Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, E⁺

(a) Chlorobenzene, 2,4-dinitrochlorobenzene, p-nitrochlorobenzene

(b) Toluene, p-H₃C–C₆H₄–NO₂, p-O₂N–C₆H₄–NO₂.

Discussion

11.	Octahedral voids has 6 spheres but why we call it as octahedral.?
Answer» Octahedral voids has 6 spheres but why we call it as octahedral.?

Discussion

12.	Explain deviation without dispersion or Achromatism.
Answer» Explain deviation without dispersion or Achromatism.

Discussion

13.	what is the equivalent mass of Al2O3 ?
Answer» what is the equivalent mass of Al2O3 ?

Discussion

14.	Two samples A and B of the same gas have equal volumes and pressures. The gas in sample A is expanded isothermally to double its volume and the gas in B is expanded adiabatically to double its volume. If the work done by the gas is the same for the two cases, then γ (specific heat) satisfies the equation
Answer» Two samples A and B of the same gas have equal volumes and pressures. The gas in sample A is expanded isothermally to double its volume and the gas in B is expanded adiabatically to double its volume. If the work done by the gas is the same for the two cases, then $γ$ (specific heat) satisfies the equation

Discussion

15.	the energy gap between the two sets of orbital is small enough to prevent electron enetring 3d orbital. What does the above statement mean
Answer» the energy gap between the two sets of orbital is small enough to prevent electron enetring 3d orbital. What does the above statement mean

Discussion

16.	20 ml of 0.5 N HCl and 35 ml of 0.1 N NaOH are mixed. The resulting solution will be
Answer» 20 ml of 0.5 N HCl and 35 ml of 0.1 N NaOH are mixed. The resulting solution will be

Discussion

17.	Select the rate law that conforms to the following data for the reaction : A+B→Products Exp No.[A](mol L−1)[B](mol L−1)Initial rate(mol L−1S−1)10.00120.00351×10−420.0240.0708×10−330.0240.0351×10−340.0120.0708×10−3
Answer» Select the rate law that conforms to the following data for the reaction : $A + B \to P r o d u c t s$ $\begin{matrix} E x p N o . & [A] (m o l L^{- 1}) & [B] (m o l L^{- 1}) & I n i t i a l r a t e (m o l L^{- 1} S^{- 1}) 1 & 0.0012 & 0.0035 & 1 \times 10^{- 4} 2 & 0.024 & 0.070 & 8 \times 10^{- 3} 3 & 0.024 & 0.035 & 1 \times 10^{- 3} 4 & 0.012 & 0.070 & 8 \times 10^{- 3} \end{matrix}$

Discussion

18.	is there any difference between the molarity and molality
Answer» is there any difference between the molarity and molality

Discussion

19.	A concentrated solution of sulphuric acid is 98% H2SO4 by mass and has a density of 1.84 g/mL. What volume of this concentrated acid solution is required to make 6 L of a 6.13 M H2SO4 solution?(Molar mass of H2SO4=98 g/mol)
Answer» A concentrated solution of sulphuric acid is 98% $H_{2} S O_{4}$ by mass and has a density of $1.84 g / m L$ . What volume of this concentrated acid solution is required to make $6 L$ of a $6.13 M H_{2} S O_{4}$ solution? (Molar mass of $H_{2} S O_{4} = 98 g / m o l$ )

Discussion

20.	The electronic arrangement that violates Pauli's exclusion principle among the following is:
Answer» The electronic arrangement that violates Pauli's exclusion principle among the following is:

Discussion

21.	26.If the de-broglie wavelengths for a proton and for alpha particle are equal, then the ratio of their velocities will be in the ratio a) 4:1 b) 2:1 c) 1:2 d) 1:4
Answer» 26.If the de-broglie wavelengths for a proton and for alpha particle are equal, then the ratio of their velocities will be in the ratio a) 4:1 b) 2:1 c) 1:2 d) 1:4

Discussion

22.	The entropy of a pure crystal is zero at absolute zero. This is statement of
Answer» The entropy of a pure crystal is zero at absolute zero. This is statement of

Discussion

23.	Calculate the number of sodium atoms present in 5.3 g of Na2CO3.
Answer» Calculate the number of sodium atoms present in $5.3 g$ of $N a_{2} C O_{3}$ .

Discussion

24.	The total number of amines among the following which can be synthesized by Gabriel synthesis is CH3CH2NH2
Answer» The total number of amines among the following which can be synthesized by Gabriel synthesis is $C H_{3} C H_{2} N H_{2}$

Discussion

25.	Consider a reaction:N2 (g)+3H2 (g)⇌2NH3 (g)Given that ,Keq=7×105ΔS∘NH3=−23.66 cal mol−1K−1Both the values are at 300KFind the value of ΔH∘NH3 ( in kcal mol−1) ( upto two decimal) at 300 KTake ln(7)=1.95
Answer» Consider a reaction: $N_{2} (g) + 3 H_{2} (g) ⇌ 2 N H_{3} (g)$ Given that , $K_{e q} = 7 \times 10^{5}$ $Δ S_{N H_{3}}^{\circ} = - 23.66 c a l m o l^{- 1} K^{- 1}$ Both the values are at 300K Find the value of $Δ H_{N H_{3}}^{\circ}$ ( in $k c a l m o l^{- 1}$ ) ( upto two decimal) at 300 K Take $l n (7) = 1.95$

Discussion

26.	Colloidal solution of arsenious sulphide can be prepared by [AMU 1985]
Answer» Colloidal solution of arsenious sulphide can be prepared by [AMU 1985]

26.

Colloidal solution of arsenious sulphide can be prepared by [AMU 1985]

Answer»

Colloidal solution of arsenious sulphide can be prepared by

[AMU 1985]

Discussion

27.	it half life of 1 order reaction is 2hrs then time required to complete 93.75% of reaction is
Answer» it half life of 1 order reaction is 2hrs then time required to complete 93.75% of reaction is

Discussion

28.	Give the significance of a ‘lattice point’.
Answer» Give the significance of a ‘lattice point’.

Discussion

29.	The heat of formation of C2H5OH(l) is −66 kcal mol−1. The heat of combustion of CH3OCH3 (g) is −348 kcal mol−1. △Hf for H2O and CO2 are −68 kcal mol−1 and −94 kcal mol−1 respectively. Then, the △H for reaction C2H5OH(l)→CH3OCH3(g) is :
Answer» The heat of formation of $C_{2} H_{5} O H (l)$ is $- 66 k c a l m o l^{- 1}$ . The heat of combustion of $C H_{3} O C H_{3} (g)$ is $- 348 k c a l m o l^{- 1}$ . $△ H_{f}$ for $H_{2} O$ and $C O_{2}$ are $- 68 k c a l m o l^{- 1}$ and $- 94 k c a l m o l^{- 1}$ respectively. Then, the $△ H$ for reaction $C_{2} H_{5} O H (l) \to C H_{3} O C H_{3} (g)$ is :

Discussion

30.	39.What happens on hydrolysis of sodium benzoate
Answer» 39.What happens on hydrolysis of sodium benzoate

Discussion

31.	In Kjeldahl’s method for the estimation of nitrogen present in a soil sample, the ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M H2SO4. The percentage of nitrogen in the soil is:
Answer» In Kjeldahl’s method for the estimation of nitrogen present in a soil sample, the ammonia evolved from $0.75 g$ of sample neutralized $10 mL$ of $1 M H_{2} S O_{4}$ . The percentage of nitrogen in the soil is:

Discussion

32.	If the equilibrium constant (KC) for a reversible reaction is 5×1013 at 300 K, then the value of ΔrGo at the same temperature will be:
Answer» If the equilibrium constant $(K_{C})$ for a reversible reaction is $5 \times 10^{13}$ at 300 K, then the value of $Δ r G^{o}$ at the same temperature will be:

Discussion

33.	The oxidation states of ′P′ in H4P2O7, H4P2O5 and H4P2O6, respectively are:
Answer» The oxidation states of $^{'} P^{'}$ in $H_{4} P_{2} O_{7}$ , $H_{4} P_{2} O_{5}$ and $H_{4} P_{2} O_{6}$ , respectively are:

Discussion

34.	The specific rate constant of decomposition of a compound is represented by lnk=5.0−12000T. The activation energy (in Kcal/mol) of decomposition for this compound at 300 K is:
Answer» The specific rate constant of decomposition of a compound is represented by $ln k = 5.0 - \frac{12000}{T}$ . The activation energy (in $Kcal/mol$ ) of decomposition for this compound at $300 K$ is:

Discussion

35.	If nuclei of a radioactive element is produced at constant rate α and they decay with decay constant λ. At t = 0, number of nuclei is zero than the number of nuclei at time t is
Answer» If nuclei of a radioactive element is produced at constant rate $α$ and they decay with decay constant $λ$ . At t = 0, number of nuclei is zero than the number of nuclei at time t is

Discussion

36.	The frequency of radiation with wavelength 480 nm is:
Answer» The frequency of radiation with wavelength 480 nm is:

Discussion

37.	37. Whai formula for calculation of ph of aqueous solution of NaCN
Answer» 37. Whai formula for calculation of ph of aqueous solution of NaCN

Discussion

38.	16 g oxygen gas expands at STP to occupy double of its original volume. Calculate the work done during the process is:
Answer» $16 g$ oxygen gas expands at $S T P$ to occupy double of its original volume. Calculate the work done during the process is:

Discussion

39.	IP1 and IP2 of Mg are 178 and 348 K cal mol−1 respectively. The energy required for the reaction Mg→Mg2++2e− is:
Answer» $I P_{1}$ and $I P_{2}$ of $M g$ are 178 and $348 {K cal mol}^{- 1}$ respectively. The energy required for the reaction $M g \to M g^{2 +} + 2 e^{-}$ is:

Discussion

40.	Which of the following pairs of reagents will not form ether?
Answer» Which of the following pairs of reagents will not form ether?

Discussion

41.	Which of the following does not give oxygen on heating?
Answer» Which of the following does not give oxygen on heating?

Discussion

42.	Choose the correct order of alkyl group attached to aldehyde that prefer the nucleophilic addition at carbonyl carbon?
Answer» Choose the correct order of alkyl group attached to aldehyde that prefer the nucleophilic addition at carbonyl carbon?

Discussion

43.	Al + KMnO4 + H2SO4 = KHSO4 + Al2(SO4)3 + MnSO4 + H2OKNO3 + FeSO4 + H2SO4 = KHSO4 + Fe2(SO4)3 + NO H2OH2S + K2Cr2O7 + H2SO4 =KHSO4 + Cr2(SO4)3 + S + H2OBalance the equations using ion-electron method.
Answer» Al + KMnO4 + H2SO4 = KHSO4 + Al2(SO4)3 + MnSO4 + H2O KNO3 + FeSO4 + H2SO4 = KHSO4 + Fe2(SO4)3 + NO H2O H2S + K2Cr2O7 + H2SO4 =KHSO4 + Cr2(SO4)3 + S + H2O Balance the equations using ion-electron method.

Discussion

44.	A straight chain dicarboxylic acid on heating gives five membered homocyclic ring. Total number of carbon atoms in the dicarboxylic acid is
Answer» A straight chain dicarboxylic acid on heating gives five membered homocyclic ring. Total number of carbon atoms in the dicarboxylic acid is

Discussion

45.	Two possible stereo-structures of CH3CH(OH)COOH which are optically active, are called:
Answer» Two possible stereo-structures of $C H_{3} C H (O H) C O O H$ which are optically active, are called:

Discussion

46.	Numerical value of the ratio of displacement to distance is
Answer» Numerical value of the ratio of displacement to distance is

Discussion

47.	Consider two hydrogen like ions A and B. Ionization energy of A is greater than that of B. Let r, u, E and L represent the radius of the orbit, speed of the electron, energy of the atom and orbital angular momentum of the electron respectively. In ground state-
Answer» Consider two hydrogen like ions $A$ and $B .$ Ionization energy of $A$ is greater than that of $B .$ Let $r, u, E$ and $L$ represent the radius of the orbit, speed of the electron, energy of the atom and orbital angular momentum of the electron respectively. In ground state-

Discussion

48.	At 500 K, the equilibrium constant for cis−C2H2Cl2(g)⇋trans−C2H2Cl2(g) is 0.6. At the same temperature, the equilibrium constant for the reaction, trans−C2H2Cl2(g)⇋cis−C2H2Cl2(g) will be:
Answer» At $500 K$ , the equilibrium constant for $cis - C_{2} H_{2} C l_{2} (g) ⇋ trans - C_{2} H_{2} C l_{2} (g)$ is $0.6$ . At the same temperature, the equilibrium constant for the reaction, $trans - C_{2} H_{2} C l_{2} (g) ⇋ cis - C_{2} H_{2} C l_{2} (g)$ will be:

Discussion

49.	Explain Purification of organic compounds by all method.
Answer» Explain Purification of organic compounds by all method.

Discussion

50.	Is octahedral and tetrahedral voids are only present in face centerd lattice
Answer» Is octahedral and tetrahedral voids are only present in face centerd lattice

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

On treating a mixture of two alkyl halides with sodium metal in dry ether, 2−methyl propane was obtained as one of the products. The alkyl halides are:

The molar conductance of NH4OH at 0.01M concentration is 11.3 ohm−1 cm2 mol−1. The degree of dissociationof NH4OH is(molar conductance at infinite dilution is 271.1)

How many neutrons and protons are there in the following nuclei? 136C ,168O ,2412Mg ,5626Fe ,8838Sr

In which of the following reaction isalmost completed:-(1) K= 10^-1(2) K=1(3) K=10^3(4) K=10^-2

Benzene diazonium chloride on reaction with phenol in weakly basic medium gives?Diphenyl etherp-Hydroxy azobenzeneChlorobenzeneBenzene

Why phosphorus is termed as a typical element?

Which of the following compounds will dissolve in an alkali solution after it has undergone reaction with Hinsberg reagent?

Which of the following undergoes nucleophilic substitution exclusivelyby SN1 mechanism?

Which of the following pairs of compounds is isoelectric and isostructural?

Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, E+ (a) Chlorobenzene, 2,4-dinitrochlorobenzene, p-nitrochlorobenzene (b) Toluene, p-H3C–C6H4–NO2, p-O2N–C6H4–NO2.

Octahedral voids has 6 spheres but why we call it as octahedral.?

Explain deviation without dispersion or Achromatism.

what is the equivalent mass of Al2O3 ?

the energy gap between the two sets of orbital is small enough to prevent electron enetring 3d orbital. What does the above statement mean

20 ml of 0.5 N HCl and 35 ml of 0.1 N NaOH are mixed. The resulting solution will be

Select the rate law that conforms to the following data for the reaction : A+B→Products Exp No.[A](mol L−1)[B](mol L−1)Initial rate(mol L−1S−1)10.00120.00351×10−420.0240.0708×10−330.0240.0351×10−340.0120.0708×10−3

is there any difference between the molarity and molality

A concentrated solution of sulphuric acid is 98% H2SO4 by mass and has a density of 1.84 g/mL. What volume of this concentrated acid solution is required to make 6 L of a 6.13 M H2SO4 solution?(Molar mass of H2SO4=98 g/mol)

The electronic arrangement that violates Pauli's exclusion principle among the following is:

26.If the de-broglie wavelengths for a proton and for alpha particle are equal, then the ratio of their velocities will be in the ratio a) 4:1 b) 2:1 c) 1:2 d) 1:4

The entropy of a pure crystal is zero at absolute zero. This is statement of

Calculate the number of sodium atoms present in 5.3 g of Na2CO3.

The total number of amines among the following which can be synthesized by Gabriel synthesis is CH3CH2NH2

Consider a reaction:N2 (g)+3H2 (g)⇌2NH3 (g)Given that ,Keq=7×105ΔS∘NH3=−23.66 cal mol−1K−1Both the values are at 300KFind the value of ΔH∘NH3 ( in kcal mol−1) ( upto two decimal) at 300 KTake ln(7)=1.95

Colloidal solution of arsenious sulphide can be prepared by [AMU 1985]

it half life of 1 order reaction is 2hrs then time required to complete 93.75% of reaction is

Give the significance of a ‘lattice point’.

The heat of formation of C2H5OH(l) is −66 kcal mol−1. The heat of combustion of CH3OCH3 (g) is −348 kcal mol−1. △Hf for H2O and CO2 are −68 kcal mol−1 and −94 kcal mol−1 respectively. Then, the △H for reaction C2H5OH(l)→CH3OCH3(g) is :

39.What happens on hydrolysis of sodium benzoate

In Kjeldahl’s method for the estimation of nitrogen present in a soil sample, the ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M H2SO4. The percentage of nitrogen in the soil is:

If the equilibrium constant (KC) for a reversible reaction is 5×1013 at 300 K, then the value of ΔrGo at the same temperature will be:

The oxidation states of ′P′ in H4P2O7, H4P2O5 and H4P2O6, respectively are:

The specific rate constant of decomposition of a compound is represented by lnk=5.0−12000T. The activation energy (in Kcal/mol) of decomposition for this compound at 300 K is:

If nuclei of a radioactive element is produced at constant rate α and they decay with decay constant λ. At t = 0, number of nuclei is zero than the number of nuclei at time t is

The frequency of radiation with wavelength 480 nm is:

37. Whai formula for calculation of ph of aqueous solution of NaCN

16 g oxygen gas expands at STP to occupy double of its original volume. Calculate the work done during the process is:

IP1 and IP2 of Mg are 178 and 348 K cal mol−1 respectively. The energy required for the reaction Mg→Mg2++2e− is:

Which of the following pairs of reagents will not form ether?

Which of the following does not give oxygen on heating?

Choose the correct order of alkyl group attached to aldehyde that prefer the nucleophilic addition at carbonyl carbon?

Al + KMnO4 + H2SO4 = KHSO4 + Al2(SO4)3 + MnSO4 + H2OKNO3 + FeSO4 + H2SO4 = KHSO4 + Fe2(SO4)3 + NO H2OH2S + K2Cr2O7 + H2SO4 =KHSO4 + Cr2(SO4)3 + S + H2OBalance the equations using ion-electron method.

A straight chain dicarboxylic acid on heating gives five membered homocyclic ring. Total number of carbon atoms in the dicarboxylic acid is

Two possible stereo-structures of CH3CH(OH)COOH which are optically active, are called:

Numerical value of the ratio of displacement to distance is

Consider two hydrogen like ions A and B. Ionization energy of A is greater than that of B. Let r, u, E and L represent the radius of the orbit, speed of the electron, energy of the atom and orbital angular momentum of the electron respectively. In ground state-

At 500 K, the equilibrium constant for cis−C2H2Cl2(g)⇋trans−C2H2Cl2(g) is 0.6. At the same temperature, the equilibrium constant for the reaction, trans−C2H2Cl2(g)⇋cis−C2H2Cl2(g) will be:

Explain Purification of organic compounds by all method.

Is octahedral and tetrahedral voids are only present in face centerd lattice