Choose
the correct answer:
1. An aqueous solution
of borax is
a) neutral
b) acidic
c) basic
d) amphoteric
Solution:
2. Boric acid is an acid because its molecule
a) contains replaceable H+ ion
b) gives up a proton
c) combines with proton to form water molecule
d) accepts OH- from
water ,releasing proton.
Solution:
B(OH)3 + H2O ↔
[B (OH)4 + H+
3. Which among the following is not a borane?
a) B2 H6
b) B3 H6
c) B4 H10
d) none of these
Solution:
nido borane : BnH4+n
aracno borane : BnH6+n
B3H6 is not a
borane
4. Which of the
following metals has the largest abundance in the earth’s crust?
a) Aluminium
b) calcium
c) Magnesium
d) sodium
5. In diborane, the number of electrons that accounts for banana
bonds is
a) six
b) two
c) four
d) three
Solution:
There are two 3c – 2e-bonding in the bridges account for 4
electrons.
6. The element that does not show catenation among the following
p-block elements is
a) Carbon
b) silicon
c) Lead
d) germanium
7. Carbon atoms in fullerene with formula C60 have
a) sp3
hybridised
b) sp hybridised
c) sp2 hybridised
d) partially sp2
and partially sp3 hybridised
8. Oxidation state of carbon in its hydrides
a) +4
b) -4
c) +3
d) +2
Solution:
Example : CH4+
in which the oxidation state of carbon is +4
9. The basic structural
unit of silicates is
a) ( SiO3 )2−
b) ( SiO4 )2−
c) ( SiO)−
d) ( SiO4 )4−
10. The repeating unit
in silicone is
a) SiO2
Ans: b
11. Which of these is
not a monomer for a high molecular mass silicone polymer?
a) Me3SiCl
b) PhSiCl3
c) MeSiCl3
d) Me2SiCl2
12. Which of the
following is not sp2 hybridised?
a) Graphite
b) graphene
c) Fullerene
d) dry ice
Solution:
dry ice – solid CO2 in
which carbon is in sp hybridized state
13. The geometry at
which carbon atom in diamond are bonded to each other is
a) Tetrahedral
b) hexagonal
c) Octahedral
d) none of these
14. Which of the
following statements is not correct?
a) Beryl is a cyclic
silicate
b) Mg2SiO4
is an orthosilicate
c) SiO4 4−is the basic structural
unit of silicates
d) Feldspar is not aluminosilicate
15. AlF3 is
soluble in HF only in the presence of KF. It is due to the formation of
a) K3 [ AlF3H3
]
b) K3 [ AlF6 ]
c) AlH3
d) K[ AlF3H]
Solution:
AlF3 + 3KF →
K3[AlF6]
16. Match items in
column - I with the items of column – II and assign the correct code.
a)
A-2 , B-1 , C-4 , D-3
b) A-1 , B-2 , C-4 , D-3
c) A-1 , B-2 , C-4 , D-3
d) none of these
17. Duralumin is an alloy of
a) Cu,Mn
b) Cu,Al,Mg
c) Al,Mn
d) Al,Cu,Mn,Mg
Solution:
Al-95% , Cu-4% , Mn-0.5% , Mn-0.5%
18. Thermodynamically the most stable form of carbon is
a) Diamond
b) graphite
c) Fullerene
d) none of these
19. The compound that is
used in nuclear reactors as protective shields and control rods is
a) Metal borides
b) metal oxides
c) Metal carbonates
d) metal carbide
20. The stability of +1 oxidation state increases in the sequence
a) Al < Ga < In < Tl
b) Tl < In < Ga
< Al
c) In < Tl < Ga
< Al
d) Ga< In < Al
< Tl
Solution
stability of +1 oxidation state
decreases down the group due to inert pair effect
Copyright © 2018-2021 BrainKart.com; All Rights Reserved. (BS) Developed by Therithal info, Chennai.