2600 + Interview Questions in Chemistry Page 2 InterviewSolution

51.	CH3CH2Cl NaCN−−−−→ XNi/H2−−−−→ YAcetic−−−−−→anhydrideZ 'Z' in the above sequence is:
Answer» $C H_{3} C H_{2} C l N a C N - --- \to X N i / H_{2} - --- \to Y Acetic - ---- \to anhydride Z$ 'Z' in the above sequence is:

Discussion

52.	The unit of ionic product of water (Kw) is:
Answer» The unit of ionic product of water $(K_{w})$ is:

Discussion

53.	Transitional elements exhibit variable valences because they release e− from
Answer» Transitional elements exhibit variable valences because they release $e^{-}$ from

Discussion

54.	The number of products (excluding stereoisomes) formed in the given reaction are
Answer» The number of products (excluding stereoisomes) formed in the given reaction are

Discussion

55.	Find the n-factor in the following chemical change. KMnO4 OH− −−−−→Mn6+
Answer» Find the n-factor in the following chemical change. $K M n O_{4} O H^{-} - --- \to M n^{6 +}$

Discussion

56.	Which of the following processes is not involved in the extraction of Fe?
Answer» Which of the following processes is not involved in the extraction of Fe?

Discussion

57.	The specific heats of iodine vapour and solid are 0.031 cal K−1g−1 and 0.055 cal K−1g−1 respectively. If heat of sublimation of iodine is 24 cal/g at 200∘C, calculate its value at 250∘C.
Answer» The specific heats of iodine vapour and solid are $0.031 c a l K^{- 1} g^{- 1}$ and $0.055 c a l K^{- 1} g^{- 1}$ respectively. If heat of sublimation of iodine is 24 cal/g at $200^{\circ} C$ , calculate its value at $250^{\circ} C$ .

Discussion

58.	The correct order of decreasing X−O−X bond angle is:
Answer» The correct order of decreasing $X - O - X$ bond angle is:

Discussion

59.	Find the shortest distance between the tetrahedral voids in face centred cubic unit cell. [Given : The edge length of unit cell is ‘a’]फलक केन्द्रित घनीय एकक कोष्ठिका में चतुष्फलकीय रिक्तियों के मध्य न्यूनतम दूरी ज्ञात कीजिए। [दिया गया है : एकक कोंष्ठका की कोर लम्बाई ‘a’ है]
Answer» Find the shortest distance between the tetrahedral voids in face centred cubic unit cell. [Given : The edge length of unit cell is ‘a’] फलक केन्द्रित घनीय एकक कोष्ठिका में चतुष्फलकीय रिक्तियों के मध्य न्यूनतम दूरी ज्ञात कीजिए। [दिया गया है : एकक कोंष्ठका की कोर लम्बाई ‘a’ है]

Discussion

60.	200 g of a calcium carbonate sample decomposes on heating to give carbon dioxide and 80 g of calcium oxide. What will be the percentage purity of calcium carbonate in the sample?(Given:CaCO3→CaO+CO2)
Answer» $200 g$ of a calcium carbonate sample decomposes on heating to give carbon dioxide and $80 g$ of calcium oxide. What will be the percentage purity of calcium carbonate in the sample? ( $G i v e n : C a C O_{3} \to C a O + C O_{2}$ )

Discussion

61.	Benzene hexachloride (BHC) is used as[MP PMT 1994; KCET 1999]
Answer» Benzene hexachloride (BHC) is used as [MP PMT 1994; KCET 1999]

61.

Benzene hexachloride (BHC) is used as[MP PMT 1994; KCET 1999]

Answer»

Benzene hexachloride (BHC) is used as

[MP PMT 1994; KCET 1999]

Discussion

62.	About 'X' and 'Y' the correct statements areI. 'X' is inorganic acid 'Y' on oxidation with acidified KMnO4 gives organic acidII. In 'X' central atom exhibit sp3 and in 'Y' 1st and 2nd carbon exhibit sp2 and sp3 hybridisationsIII. Both 'X' and 'Y' acts as reducing agentsIV. Both 'X' and 'Y' are oxidized products in the reaction
Answer» About 'X' and 'Y' the correct statements are I. 'X' is inorganic acid 'Y' on oxidation with acidified KMnO₄ gives organic acid II. In 'X' central atom exhibit sp³ and in 'Y' 1^st and 2^nd carbon exhibit sp² and sp³ hybridisations III. Both 'X' and 'Y' acts as reducing agents IV. Both 'X' and 'Y' are oxidized products in the reaction

62.

About 'X' and 'Y' the correct statements areI. 'X' is inorganic acid 'Y' on oxidation with acidified KMnO4 gives organic acidII. In 'X' central atom exhibit sp3 and in 'Y' 1st and 2nd carbon exhibit sp2 and sp3 hybridisationsIII. Both 'X' and 'Y' acts as reducing agentsIV. Both 'X' and 'Y' are oxidized products in the reaction

Answer»

About 'X' and 'Y' the correct statements are

I. 'X' is inorganic acid 'Y' on oxidation with acidified KMnO₄ gives organic acid

II. In 'X' central atom exhibit sp³ and in 'Y' 1^st and 2^nd carbon exhibit sp² and sp³ hybridisations

III. Both 'X' and 'Y' acts as reducing agents

IV. Both 'X' and 'Y' are oxidized products in the reaction

Discussion

63.	The pair(s) of reagents that yield paramagnetic species is/are :
Answer» The pair(s) of reagents that yield paramagnetic species is/are :

Discussion

64.	Which of the following set of quantum numbers is permissible?
Answer» Which of the following set of quantum numbers is permissible?

Discussion

65.	Which of the following is the correct structure of D.D.T.?
Answer» Which of the following is the correct structure of D.D.T.?

Discussion

66.	The correct statement(s) about the compound given below
Answer» The correct statement(s) about the compound given below

66.

The correct statement(s) about the compound given below

Answer»

The correct statement(s) about the compound given below

Discussion

67.	One mole of magnesium in the vapour state absorbed 1200 kJ mole−1 of energy. If the first and second ionization energies of Mg are 750 and 1450 kJ mole−1 respectively, the final composition of the mixture is
Answer» One mole of magnesium in the vapour state absorbed 1200 kJ ${m o l e}^{- 1}$ of energy. If the first and second ionization energies of Mg are 750 and 1450 kJ ${m o l e}^{- 1}$ respectively, the final composition of the mixture is

Discussion

68.	Which will show geometrical isomerism?
Answer» Which will show geometrical isomerism?

Discussion

69.	Which of the following has chiral structure ?
Answer» Which of the following has chiral structure ?

Discussion

70.	Which one of the following statements for the order of a reaction is incorrect?
Answer» Which one of the following statements for the order of a reaction is incorrect?

Discussion

71.	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

72.	In calcium fluoride, having the fluorite structure the coordination numbers for the calcium ion Ca2+ and fluoride ion (F−) are
Answer» In calcium fluoride, having the fluorite structure the coordination numbers for the calcium ion $C a^{2 +}$ and fluoride ion $(F^{-})$ are

Discussion

73.	The threshold frequency ν0 for a metal is 7.0×1014 s−1. Calculate the kinetic energy of an electron emitted when a radiation of frequency ν=1.0×1015 s−1 hits the metal.
Answer» The threshold frequency $ν_{0}$ for a metal is $7.0 \times 10^{14} s^{- 1}$ . Calculate the kinetic energy of an electron emitted when a radiation of frequency $ν = 1.0 \times 10^{15} s^{- 1}$ hits the metal.

Discussion

74.	Find the number of O-atoms in 23 moles of NO2.
Answer» Find the number of O-atoms in $\frac{2}{3}$ moles of $N O_{2}$ .

Discussion

75.	4-chloro-3, 5-dimethyl phenol is called [KCET 2003]
Answer» 4-chloro-3, 5-dimethyl phenol is called [KCET 2003]

Discussion

76.	Propan-1-ol can be prepared from propene by [AIIMS 2003]
Answer» Propan-1-ol can be prepared from propene by [AIIMS 2003]

Discussion

77.	The order of stability of the following carbocations :is :
Answer» The order of stability of the following carbocations : is :

77.

The order of stability of the following carbocations :is :

Answer»

The order of stability of the following carbocations :

is :

Discussion

78.	Which of the following can be called as a conjugate acid - base pair?
Answer» Which of the following can be called as a conjugate acid - base pair?

Discussion

79.	The effective atomic number of central Cu (At. No. 29) metal in [Cu(NH3)4]SO4 is
Answer» The effective atomic number of central Cu (At. No. 29) metal in $[C u (N H_{3})_{4}] S O_{4}$ is

Discussion

80.	Be2+ is isoelectronic with
Answer» $B e^{2 +}$ is isoelectronic with

Discussion

81.	A compound with formula AB2O4 adopts a crystal structure in which O2− ions forms ccp arrangement. A2+ ions occupy octahedral voids while B3+ ions are distributed equally between tetrahedral and octahedral voids. The fraction of octahedral and tetrahedral voids occupied respectively are:
Answer» A compound with formula $A B_{2} O_{4}$ adopts a crystal structure in which $O^{2 -}$ ions forms ccp arrangement. $A^{2 +}$ ions occupy octahedral voids while $B^{3 +}$ ions are distributed equally between tetrahedral and octahedral voids. The fraction of octahedral and tetrahedral voids occupied respectively are:

Discussion

82.	For a sample of perfect gas when its pressure is changed isothermally from pi to pf, the entropy change is given by
Answer» For a sample of perfect gas when its pressure is changed isothermally from $p_{i}$ to $p_{f},$ the entropy change is given by

Discussion

83.	The values of EN of A and B are 1.2 and 4.0 respectively. % ionic character in bond A - B is
Answer» The values of EN of A and B are 1.2 and 4.0 respectively. $%$ ionic character in bond A - B is

Discussion

84.	Which of the following will undergo a faster SN2?.
Answer» Which of the following will undergo a faster $S_{N} 2$ ?.

Discussion

85.	The equilibrium :Cr2O2−7 →← 2CrO2−4 exists in
Answer» The equilibrium : $C r_{2} O_{7}^{2 -}_{\leftarrow}^{\to} 2 C r O_{4}^{2 -}$ exists in

Discussion

86.	For the balanced chemical reaction,4KO2(s)+2CO2(g)→2K2CO3(s)+3O2(g)Determine the weight of solid potassium carbonate obtained when 710 g of KO2 having 60 % purity reacts.(Molar mass of K=39 g/mol)
Answer» For the balanced chemical reaction, $4 K O_{2} (s) + 2 C O_{2} (g) \to 2 K_{2} C O_{3} (s) + 3 O_{2} (g)$ Determine the weight of solid potassium carbonate obtained when $710 g$ of $K O_{2}$ having 60 % purity reacts. (Molar mass of $K = 39 g/mol$ )

Discussion

87.	Convert the following condensed structure into bond line structure CH3CONHCH2OCH3
Answer» Convert the following condensed structure into bond line structure $C H_{3} C O N H C H_{2} O C H_{3}$

Discussion

88.	Maximum -I effect exerted by which of the following group ?
Answer» Maximum -I effect exerted by which of the following group ?

Discussion

89.	Among the following, incorrect order is:
Answer» Among the following, incorrect order is:

Discussion

90.	Ksp of CdS=8×10−27, Ksp of ZnS=1×10−21, Ka of H2S=1×10−21.What [H+] must be maintained in saturated H2S(0.1 M) to precipitate CdS but not ZnS, if [Cd2+]=[Zn2+]=0.1 M initially?
Answer» $K_{s p}$ of $C d S = 8 \times 10^{- 27}$ , $K_{s p}$ of $Z n S = 1 \times 10^{- 21}$ , $K_{a}$ of $H_{2} S = 1 \times 10^{- 21}$ . What $[H^{+}]$ must be maintained in saturated $H_{2} S (0.1 M)$ to precipitate $C d S$ but not $Z n S$ , if $[C d^{2 +}] = [Z n^{2 +}] = 0.1 M$ initially?

Discussion

91.	In which block 106th element belongs?
Answer» In which block $106^{t h}$ element belongs?

Discussion

92.	Among the elements Ca, Mg, P and Cl there order of increasing atomic radii is
Answer» Among the elements Ca, Mg, P and Cl there order of increasing atomic radii is

Discussion

93.	Out of the following which will show geometrical isomerism as facial and meridional isomers?
Answer» Out of the following which will show geometrical isomerism as facial and meridional isomers?

Discussion

94.	Equal volumes of 0.1 M AgNO3 and 0.2 M NaCl are mixed. The concentration of NO−3 ions in the mixture will be:
Answer» Equal volumes of $0.1 M A g N O_{3}$ and $0.2 M N a C l$ are mixed. The concentration of $N O_{3}^{-}$ ions in the mixture will be:

Discussion

95.	Select the correct wedge dash projection of following compound.
Answer» Select the correct wedge dash projection of following compound.

Discussion

96.	The salt bridge in the electrochemical cell serves to
Answer» The salt bridge in the electrochemical cell serves to

Discussion

97.	A compound ′X′ having molecular formula C5H8, reacts with ammoniacal AgNO3 to give a white precipitate and reacts with excess of KMnO4 to give the acid, (CH3)2CH−COOH. Therefore, X is:
Answer» A compound $^{'} X^{'}$ having molecular formula $C_{5} H_{8}$ , reacts with ammoniacal $A g N O_{3}$ to give a white precipitate and reacts with excess of $K M n O_{4}$ to give the acid, $(C H_{3})_{2} C H - C O O H$ . Therefore, $X$ is:

Discussion

98.	What is the n-factor of H3PO3 ?
Answer» What is the n-factor of $H_{3} P O_{3}$ ?

Discussion

99.	Which of the following halogen group when attached to a carbon chain shows minimum −I effect?
Answer» Which of the following halogen group when attached to a carbon chain shows minimum $- I$ effect?

Discussion

100.	If 'Cu' forms two mono atomic cations with oxidation number +1 and +2, then it will respectively be called as:
Answer» If 'Cu' forms two mono atomic cations with oxidation number +1 and +2, then it will respectively be called as:

Discussion

Explore topic-wise InterviewSolutions in .

CH3CH2Cl NaCN−−−−→ XNi/H2−−−−→ YAcetic−−−−−→anhydrideZ 'Z' in the above sequence is:

The unit of ionic product of water (Kw) is:

Transitional elements exhibit variable valences because they release e− from

The number of products (excluding stereoisomes) formed in the given reaction are

Find the n-factor in the following chemical change. KMnO4 OH− −−−−→Mn6+

Which of the following processes is not involved in the extraction of Fe?

The specific heats of iodine vapour and solid are 0.031 cal K−1g−1 and 0.055 cal K−1g−1 respectively. If heat of sublimation of iodine is 24 cal/g at 200∘C, calculate its value at 250∘C.

The correct order of decreasing X−O−X bond angle is:

200 g of a calcium carbonate sample decomposes on heating to give carbon dioxide and 80 g of calcium oxide. What will be the percentage purity of calcium carbonate in the sample?(Given:CaCO3→CaO+CO2)

Benzene hexachloride (BHC) is used as[MP PMT 1994; KCET 1999]

The pair(s) of reagents that yield paramagnetic species is/are :

Which of the following set of quantum numbers is permissible?

Which of the following is the correct structure of D.D.T.?

The correct statement(s) about the compound given below

One mole of magnesium in the vapour state absorbed 1200 kJ mole−1 of energy. If the first and second ionization energies of Mg are 750 and 1450 kJ mole−1 respectively, the final composition of the mixture is

Which will show geometrical isomerism?

Which of the following has chiral structure ?

Which one of the following statements for the order of a reaction is incorrect?

The number of atoms in 4.25 g of NH3 is approximately

In calcium fluoride, having the fluorite structure the coordination numbers for the calcium ion Ca2+ and fluoride ion (F−) are

The threshold frequency ν0 for a metal is 7.0×1014 s−1. Calculate the kinetic energy of an electron emitted when a radiation of frequency ν=1.0×1015 s−1 hits the metal.

Find the number of O-atoms in 23 moles of NO2.

4-chloro-3, 5-dimethyl phenol is called [KCET 2003]

Propan-1-ol can be prepared from propene by [AIIMS 2003]

The order of stability of the following carbocations :is :

Which of the following can be called as a conjugate acid - base pair?

The effective atomic number of central Cu (At. No. 29) metal in [Cu(NH3)4]SO4 is

Be2+ is isoelectronic with

A compound with formula AB2O4 adopts a crystal structure in which O2− ions forms ccp arrangement. A2+ ions occupy octahedral voids while B3+ ions are distributed equally between tetrahedral and octahedral voids. The fraction of octahedral and tetrahedral voids occupied respectively are:

For a sample of perfect gas when its pressure is changed isothermally from pi to pf, the entropy change is given by

The values of EN of A and B are 1.2 and 4.0 respectively. % ionic character in bond A - B is

Which of the following will undergo a faster SN2?.

The equilibrium :Cr2O2−7 →← 2CrO2−4 exists in

For the balanced chemical reaction,4KO2(s)+2CO2(g)→2K2CO3(s)+3O2(g)Determine the weight of solid potassium carbonate obtained when 710 g of KO2 having 60 % purity reacts.(Molar mass of K=39 g/mol)

Convert the following condensed structure into bond line structure CH3CONHCH2OCH3

Maximum -I effect exerted by which of the following group ?

Among the following, incorrect order is:

Ksp of CdS=8×10−27, Ksp of ZnS=1×10−21, Ka of H2S=1×10−21.What [H+] must be maintained in saturated H2S(0.1 M) to precipitate CdS but not ZnS, if [Cd2+]=[Zn2+]=0.1 M initially?

In which block 106th element belongs?

Among the elements Ca, Mg, P and Cl there order of increasing atomic radii is

Out of the following which will show geometrical isomerism as facial and meridional isomers?

Equal volumes of 0.1 M AgNO3 and 0.2 M NaCl are mixed. The concentration of NO−3 ions in the mixture will be:

Select the correct wedge dash projection of following compound.

The salt bridge in the electrochemical cell serves to

A compound ′X′ having molecular formula C5H8, reacts with ammoniacal AgNO3 to give a white precipitate and reacts with excess of KMnO4 to give the acid, (CH3)2CH−COOH. Therefore, X is:

What is the n-factor of H3PO3 ?

Which of the following halogen group when attached to a carbon chain shows minimum −I effect?

If 'Cu' forms two mono atomic cations with oxidation number +1 and +2, then it will respectively be called as: