Previous Year Paper year:2021 : NEET-XII-Chemistry

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NEET-XII-Chemistry

Previous Year Paper year:2021

with Solutions - page 3

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Qstn #29
The correct option for the number of body centred unit cells in all \( 14 \) types of Bravais lattice unit cells is :
(A) 7
(B) 5
(C) 2
(D) 3
digAnsr: D
Ans : D

Qstn #30
Which one of the following polymers is prepared by addition polymerisation?
(A) Teflon
(B) Nylon-66
(C) Novolac
(D) Dacron
digAnsr: A
Ans : A

Qstn #31
A particular station of All India Radio, New Delhi, broadcasts on a frequency of \( 1,368\, kHz \) (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is : [speed of light, \( \left.c=3.0 \times 10^{8} ms ^{-1}\right] \)
(A) 219.3 m
(B) 219.2 m
(C) 2192 m
(D) 21.92 cm
digAnsr: A
Ans : A

Qstn #32
Which of the following reactions is the metal displacement reaction ? Choose the right option.
(A) \( 2KClO_3 \ce{->[\Delta]} 2KCl + 3O_2 \)

(B) \( Cr_2O_3 + 2Al \ce{->[\Delta]} Al_2O_3 + 2Cr \)
(C) \( Fe + 2HCl \to FeCl_2 + H_2 \uparrow \)
(D) \( 2Pb(NO_3)_2 \to 2PbO + 4NO_2 + O_2 \uparrow \)
digAnsr: B
Ans : B

Qstn #33
The incorrect statement among the following is :
(A) Actinoid contraction is greater for element to element than Lanthanoid contraction.
(B) Most of the trivalent Lanthanoid ions are colorless in the solid state.
(C) Lanthanoids are good conductors of heat and electricity.
(D) Actinoids are highly reactive metals, especially when finely divided
digAnsr: A
Ans : A

Qstn #34
Dihedral angle of least stable conformer of ethane is:
(A) \( 120^{\circ} \)
(B) \( 180^{\circ} \)
(C) \( 60^{\circ} \)
(D) \( 0^{\circ} \)
digAnsr: D
Ans : D

Qstn #35
Match List - 1 with List - II.

List I List II

a \( PCl_5 \) i Square pyramidal

b \( SF_6 \) ii Trigonal planar

c \( BrF_5 \) iii Octahedral

d \( BF_3 \) iv Trigonal bipyramidal

Choose the correct answer from the options given below.
(A)
(a)-(iv),
(b)-(iii),
(c)-(i),
(d)-(ii)
(B)
(a)-(ii),
(b)-(iii),
(c)-(iv),
(d)-(i)
(C)
(a)-(iii),
(b)-(i),
(c)-(iv),
(d)-(ii)
(D)
(a)-(iv),
(b)-(iii),
(c)-(ii),
(d)-(i)
digAnsr: A
Ans : A

List I	List II
a	\( PCl_5 \)	i	Square pyramidal
b	\( SF_6 \)	ii	Trigonal planar
c	\( BrF_5 \)	iii	Octahedral
d	\( BF_3 \)	iv	Trigonal bipyramidal

Qstn #36
\( CH_3CH_2COO^- Na^+ \ce{->[NaOH, + ?][\text{Heat}]} CH_3CH_3 + Na_2CO_3 \) . Consider the above reaction and identify the missing reagent/chemical.
(A) \( B _{2} H _{6} \)
(B) Red Phosphorus
(C) \( CaO \)
(D) DIBAL-H
digAnsr: C
Ans : C

Qstn #37
The intermediate compound \( 'X' \) in the following chemical reaction is :
(A)

(B)

(C)

(D)

digAnsr: A
Ans : A

Qstn #38

Match L ist-I with List-II.

List I		List II
a	\( 2SO_2(g) + O_2(g) \to 2SO_3(g) \)	i	Acid rain
b	\( HOCl(g) \ce{->[h\nu]} \overset{.}{O}H + \overset{.}{C}l \)	ii	Smog
c	\( CaCO_3 + H_2SO_4 \to CaSO_4 + H_2O + CO_2 \)	iii	Ozone depletion
d	\( NO_2 (g) \ce{->[h\nu]}NO(g) + O(g) \)	iv	Tropospheric pollution

Choose the correct answer from the options given below.

(A)
(a)-(i),
(b)-(ii),
(c)-(iii),
(d)-(iv)
(B)
(a)-(ii),
(b)-(iii),
(c)-(iv),
(d)-(i)
(C)
(a)-(iv),
(b)-(iii),
(c)-(i),
(d)-(ii)
(D)
(a)-(iii),
(b)-(ii),
(c)-(iv),
(d)-(i)

digAnsr: C

Ans : C

Qstn #39

Match List-I with List-II.

List I		List II
a		i	Hell-Volhard- Zelinsky reaction
b	\( R- \overset{\underset{\|\|}{O}}{C}-CH_3 + NaOX \to \)	ii	Gattermann-Koch reaction
c	\( R- CH_2 - OH + R'COOH \ce{->[Conc. H_2SO_4]} \)	iii	Haloform reaction
d	\( R-CH_2COOH \ce{->[(i)X_2/Red P][(ii)H_2O]} \)	iv	Esterification

Choose the correct answer from the options given below.
(A)
(a)-(iv),
(b)-(i),
(c)-(ii),
(d)-(iii)
(B)
(a)-(iii),
(b)-(ii),
(c)-(i),
(d)-(iv)
(C)
(a)-(i),
(b)-(iv),
(c)-(iii),
(d)-(ii)
(D)
(a)-(ii),
(b)-(iii),
(c)-(iv),
(d)-(i)

digAnsr: A

Ans : A

Qstn #40

Match List-I with List-II.

List I		List II
a	\( \left[ Fe ( CN )_{6}\right]^{3-} \)	i	\( 5.92 BM \)
b	\( \left[ Fe \left( H _{2} O \right)_{6}\right]^{3+} \)	ii	0 BM
c	\( \left[ Fe ( CN )_{6}\right]^{4-} \)	iii	4.90 BM
d	\( \left[ Fe \left( H _{2} O \right)_{6}\right]^{2+} \)	iv	1.73 BM

Choose the correct answer from the options given below.
(A)
(a)-(iv),
(b)-(ii),
(c)-(i),
(d)-(iii)
(B)
(a)-(ii),
(b)-(iv),
(c)-(iii),
(d)-(i)
(C)
(a)-(i),
(b)-(iii),
(c)-(iv),
(d)-(ii)
(D)
(a)-(iv),
(b)-(i),
(c)-(ii),
(d)-(iii)

digAnsr: D

Ans : D

Qstn #41
The reagent \( 'R' \) in the given sequence of chemical reaction is :
(A) \( H _{2} O \)

(B) \( CH _{3} CH _{2} OH \)
(C) \( HI \)
(D) \( CuCN / KCN \)
digAnsr: B
Ans : B

Qstn #42
The product formed in the following chemical reaction is :
(A)

(B)

(C)

(D)

digAnsr: D
Ans : D

Qstn #43
From the following pairs of ions which one is not an iso-electronic pair?
(A) \( O ^{2-}, F ^{-} \)
(B) \( Na ^{+}, Mg ^{2+} \)
(C) \( Mn ^{2+}, Fe ^{3+} \)
(D) \( Fe ^{2+}, Mn ^{2+} \)
digAnsr: D
Ans : D