NEET Chemistry MCQ - Boron Family Mcq Neet Chemistry - Quiz-4 Solution

Q.1.

Which of the following statement is not true for diborane

29%
a) When methylated it produces Me4B2H2
57%
b) All bond length B-H are equal
0%
c) Two boron atoms and four terminal hydrogen atoms lie in same plane
14%
d) Two bridging hydrogen atoms lie symmetrically above and below the plane of formed by B and Four H

Explanation

Q.2.

Boron compounds behave as Lewis acid because of their ....

17%
a) Acidic nature
50%
b) Electron deficiency
17%
c) Ionic property
17%
d) Smaller size

Explanation

Q.3.

Treatment of concentrated solution of borax with calculated quantity of H2SO4 gives

33%
a) H3BO3
50%
b) H2B4O7
0%
c) HBO2
17%
d) B2O3

Explanation

Q.4.

When powdered borax is heated strongly in Bunsen-flame it gives...

0%
a) B2O3
17%
b) NaBO2
83%
c) B2O3 + NaBO2
0%
d) Na2B4O7

Explanation

Q.5.

Anhydrous AlCl3 is prepared from ... [ MP CET 1998]

33%
a) Concentrated HCl and Al metal
0%
b) Aluminium and Cl2
50%
c) Dry HCl and heated Al metal
17%
d) Dil HCl and Al metal

Explanation

Q.6.

BF3 molecule has planar structure . Correct explanation for this is ...

33%
a) BF3 is sp3 hybridised
50%
b) BF3 is sp2 hybridised
17%
c) BF3 is sp hybridised
0%
d) BF3 spd2 hybridised

Explanation

Q.7.

Which of the element have highest melting point/

60%
a) B
0%
b) Al
40%
c) Ga
0%
d) Tl

Explanation

Q.8.

Which of the following statement is not correct? Boron differs from the other members of the group because..

33%
a) has much lower atomic radius
33%
b) is a non metal
33%
c) Has a maximum covalency 6
0%
d) is covalent in all its compound

Explanation

Q.9.

The bond angle Cl - B - Cl in BCl3 is

0%
a) 60°
40%
b) 109° 7'
40%
c) 120°
20%
d) 90°

Explanation

Q.10.

Which of the following is used in high temperature thermometry?

20%
a) Hg
60%
b) Ga
20%
c) Ca
0%
d) Sn

Explanation

Q.11.

hich of the following reaction is not shown by both "B" and "Al"

40%
a) They react with HCl to form chloride
0%
b) They burn in oxygen to give give oxide at higher temperature
20%
c) Their halides are Lewis acids
40%
d) They combine with nitrogen to form nitride

Explanation

Q.12.

Which of the following is a Lewis acid?

0%
a) PCl3
80%
b) AlCl3
20%
c) TiCl3
0%
d) NCl3

Explanation

Q.13.

Which of the following is most abundant in earth's crust

0%
a) Na
0%
b) Ca
100%
c) Al
0%
d) C

Explanation

Q.14.

Thermite is a mixture of iron oxide and

0%
a) Zinc powder
75%
b) Aluminium powder
0%
c) Copper metal
25%
d) Sodium metal

Explanation

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