M.C.Q [1M]

MCQ 11 Mark

Match the properties given in column I with the metals in column II

Column I	Column II
(1) Actinoid having configuration (RN)5f⁷6d¹7s²	(A) Ce
(2) Lanthanoid which has 4f¹⁴ electronic configuration in +3 oxidation state.	(B) Lu
(3) Lanthanoid which show +4 Oxidation state	(C) Cm

✓
(1)-(C), (2)-(B), (3)-(A)
B
(1)-(C), (2)-(A), (3)-(B)
C
(1)-(A), (2)-(B), (3)-(C)
D
(1)-(B), (2)-(A), (3)-(C)

Answer

Correct option: A.

(1)-(C), (2)-(B), (3)-(A)

(a) (1)-(C), (2)-(B), (3)-(A)

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MCQ 21 Mark

Ammonolysis of ethyl chloride followed by reaction of the amine so formed with 1 mole of methyl chloride gives an amine that

A
reacts with Hinsberg reagent to form a product soluble in an alkali.
B
on reaction with Nitrous acid, produced nitrogen gas.
✓
reacts with Benzenesulphonyl chloride to form a product that is insoluble in alkali.
D
does not react with Hinsberg reagent.

Answer

Correct option: C.

reacts with Benzenesulphonyl chloride to form a product that is insoluble in alkali.

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MCQ 31 Mark

'X' and 'Y' in the above table are

A
$X=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{2+} 3 \mathrm{Cl}^{-}, \mathrm{Y}=1: 3$
✓
$X=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+} \mathrm{Cl},-\mathrm{Y}=1: 3$
C
$X=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+} \mathrm{Cl}^{-}, \mathrm{Y}=1: 1$
D
$X=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{3+} 3 \mathrm{Cl}^{-}, \mathrm{Y}=1: 1$

Answer

Correct option: B.

$X=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+} \mathrm{Cl},-\mathrm{Y}=1: 3$

(b) $\mathrm{X}=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+} \mathrm{Cl}^{-}, \quad \mathrm{Y}=1: 3$

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MCQ 41 Mark

Which of the following compound gives an oxime with hydroxylamine:

✓
CH₃COCH₃
B
CH₃COCH
C
(CH₃CO)₂O
D
CH₃COCI

Answer

Correct option: A.

CH₃COCH₃

(a)CH₃COCH₃Aldehyde and ketones give nucleophilic addition reactions. Other carbonyl compounds do not give nucleophilic addition reactions_.

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MCQ 51 Mark

Which one of the following has the highest dipole moment?

A
$\mathrm{CH}_3 \mathrm{~F}$
✓
$\mathrm{CH}_3 \mathrm{Cl}$
C
$\mathrm{CH}_3 \mathrm{I}$
D
$\mathrm{CH}_3 \mathrm{Br}$

Answer

Correct option: B.

$\mathrm{CH}_3 \mathrm{Cl}$

(b)CH3Cl
The order followed is this CH3I<CH3Br<CH3F< CH3Cl, though F is most electronegative, the bond length is small as compared to C-Cl. Dipole moment is the product of the charge and the bond length.

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MCQ 61 Mark

A student was preparing aniline in the lab. She took a compound "X" and reduced it in the presence of Ni as a catalyst. What could be the compound "X"

✓
Nitrobenzene
B
1-Nitrohexane
C
Benzonitrile
D
1-Hexanenitrile

Answer

Correct option: A.

Nitrobenzene

(a) Nitrobenzene

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MCQ 71 Mark

Which one of the following sets correctly represents the increase in the paramagnetic property of the ions?

A
$\mathrm{Ti}^{3+}<\mathrm{Fe}^{2+}<\mathrm{Cr}^{3+}<\mathrm{Mn}^{2+}$
B
$\mathrm{Ti}^{3+}<\mathrm{Mn}^{2+}<\mathrm{Fe}^{2+}<\mathrm{Cr}^{3+}$
C
$\mathrm{Mn}^{2+}<\mathrm{Fe}^{2+}<\mathrm{Cr}^{3+}<\mathrm{Ti}^{3+}$
✓
$\mathrm{Ti}^{3+}<\mathrm{Cr}^{3+}<\mathrm{Fe}^{2+}<\mathrm{Mn}^{2+}$

Answer

Correct option: D.

$\mathrm{Ti}^{3+}<\mathrm{Cr}^{3+}<\mathrm{Fe}^{2+}<\mathrm{Mn}^{2+}$

(d) $\mathrm{Ti}^{3+}<\mathrm{Cr}^{3+}<\mathrm{Fe}^{2+}<\mathrm{Mn}^{2+}$
No. of unpaired electrons Ti³⁺(1), Cr³⁺(3), Fe²⁺(4) and Mn²⁺ (5) Paramagnetism depends on the number of unpaired electrons

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MCQ 81 Mark

Which of the following contains only ẞ-D- glucose as its monosaccharide unit:

A
Sucrose
✓
Cellulose
C
Starch
D
Maltose

Answer

Correct option: B.

Cellulose

(b) Cellulose
Starch contains only a glucose, sucrose contains α-D-glucose and ß-D-fructose glucose, maltose contains α-D-glucose and cellulose is a polymer of ß-D-glucose.

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MCQ 91 Mark

When C₆H₅COOCOCH₂ is treated with H₂O, the product obtained is:

A
Benzoic acid and ethanol
✓
Benzoic acid and ethanoic acid
C
Acetic Acid and phenol
D
Benzoic anhydride and methanol

Answer

Correct option: B.

Benzoic acid and ethanoic acid

(b) Benzoic acid and ethanoic acid
C₆H₅COOCOCH₃ H₂O C₆H₅COOH + CH₃COOH

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MCQ 101 Mark

The initial concentration of R in the reaction R→P IS 4.62 × 10^-2 mol / L What is the half life for the reaction if k = 2.31 × 10^-2 molL ^-1S^-1

A
30 s
B
3 s
✓
1 s
D
10 s

Answer

Correct option: C.

1 s

(c) the order of reaction is zero as the unit of k is moll^-1s^-1. Thus half life = [R]_° / 2k = 4.62 x 10^-2/2 x 2.31 x 10^-2

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MCQ 111 Mark

Study the graph showing the boiling points of bromoalkanes and identify the compounds.

A
1 = Bromomethane, 2= 2-Bromobutane, 3= 1-Bromobutane, 4= 2-Bromo-2-methylpropane
B
1=1-Bromobutane, 2= 2-Bromo-2-methylpropane, 3= 2-Bromobutane, 4= Bromomethane
C
1 = Bromomethane, 2=1-Bromobutane, 3= 2-Bromo-2-methylpropane, 4= 2-Bromobutane,
✓
1 =Bromomethane, 2= 2-Bromo-2-methylpropane, 3-2- Bromobutane, 4= 1-Bromobutane

Answer

Correct option: D.

1 =Bromomethane, 2= 2-Bromo-2-methylpropane, 3-2- Bromobutane, 4= 1-Bromobutane

(d) 1 =Bromomethane, 2= 2-Bromo-2-methylpropane, 3=2- Bromobutane, 4= 1-Bromobutane

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MCQ 121 Mark

A first-order reaction is found to have a rate constant, k = 5.5 x 10^-14s^-1.The time taken for completion of the reaction is:

A
1.26 x 10¹³ s
B
2.52 x 10¹³ s
C
0.63 x 10¹³ s
✓
It never goes to completion

Answer

Correct option: D.

It never goes to completion

(d) It never goes to completion
First order reaction [R] = [Ro] e^-kt If [R]=0 then
e^{- kt} = 0 which is not possible for any finite value of t. Here, t is ∞.

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Chemistry M.C.Q [1M]

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