74.

75.

76.

77.

78.

79.

80.

Read the following statement and reason, pick out a suitable answer from the following
option :
Statement : In Inorganic Chemistry, one of the analogues of benzene is borazine. This is
misnomer because the chemical properties of borazine and benzene are quite different.
Reason : Due to the difference in electronegativity between boron and nitrogen, the more
electron density is localized on boron atom so weakens the 1-bonding in the ring.
(A) Both statement and reason are acceptable.
(B) Both statement and reason are unacceptable.
(C) Statement is acceptable but the reason needs to correct.
(D) Reason is acceptable but the statement needs to correct.
Arrange the following molecules in decreasing order of infrared P=O stretching frequency :
F;PO, 020, Br;PO, ೮7೦.
(A) F,PO>CLPO>Br,PO > CIF,PO (ए) CIF,PO >F,PO > (170 > Br,PO
(൭ F,PO>CIF,PO>C1,PO>Br,PO (0) ‏ہھ‎ ٥< 0170 > F,PQ > CIF,PO

Predict the product of the following reaction :
NH, 7
3
பெட்ட) + 0० =

و01
‎NH; 7° NH 9 ۶ 29‏

(A) No 79900൩ (8) |ci—Pt—no, (೮) படர (0) 0-1-10
ங்‌ 55 CH;

Among the following complex, which one has high rate of water exchange :
[Na(OH,)¢]*, [Cr(OH,),]>*, ച), [Mg(OH,),]?*
(ಸ) [Na(OH,)J* ®) [Cr(OH,),5* ൭ [AIOH,)°*(D) Mg(OH,),]?*

Usually, a redox reaction occur between 003” complex and [೧೦2 through
inner sphere mechanism. Pick out a correct order based on rate constant for the
reaction between [Cr(OH,),]?* and various 003+ complexes, i.e, [Co(NH,),]**,
[Co(NH,),Cl}?*, [Co(NH;),I]?*.
(A) [Co(NH,),]** > [Co(NH,).CI}?* [ന്ത്‌
(8) [Co(NH,),]** > [Co(NH,),CI}?* > [Co(NH,).I]?*
(©) [Co(NH,),]3* > [Co(NH,),CIP* > [Co(NH,),I]?*
(D) [Co(NH,),]3* > [Co(NH,)An iron rod is placed parallel to magnetic field of intensity 1000 A/m. The magnetic flux
through the rod is 3 x 10-4 Wb and its cross-sectional area is 3 ണോ. The magnetic
permeability of the rod in WbA~!m is

(A) 104 (8) 101 (൭ 103 (0) 10?

Recently, a new allotrope of carbon was discovered by three Scientists : Przemyslaw
Gawel, Leo Gross & Harry L. Anderson and published (Science, 2019, Vol. 365, Issue

6459, pp. 1299-1301). Pick out that finding from the given options.
(4) sp hybridized cyclo[18]carbon (B) ಲೈ fullerene rugby ball
(C) Carbon nanotubes (D) Graphene
13 020/2021

[P.T.O.]