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Practice each question, then open the answer or worked solution.
Boric acid is an acid because its molecule
(i) contains replaceable H+ ion
(ii) gives up a proton
(iii) accepts OH– from water releasing a proton
(iv) combines with a proton from the water molecule
Option (iii) is the answer.
Catenation i.e., linking of similar atoms depends on size and electronic
configuration of atoms. The tendency of catenation in Group 14 elements
follows the order:
(i) C > Si > Ge > Sn
(ii) C >> Si > Ge ≈ Sn
(iii) Si > C > Sn > Ge
(iv) Ge > Sn > Si > C
Option (ii) is the answer.
Silicon has a strong tendency to form polymers like silicones. The chain length
of silicone, a polymer can be controlled by adding
(i) MeSiCl3
(ii) Me2SiCl2
(iii) Me3SiCl
(iv) Me4Si
Option (iii) is the answer.
Ionisation enthalpy (∆i H1
kJ mol–1) for the elements of Group 13 follows the order.
(i) B > Al > Ga > In > Tl
(ii) B < Al < Ga < In < Tl
(iii) B < Al > Ga < In > Tl
(iv) B > Al < Ga > In < Tl
Option (iv) is the answer.
In the structure of diborane
(i) All hydrogen atoms lie in one plane and boron atoms lie in a plane
perpendicular to this plane.
(ii) 2 boron atoms and 4 terminal hydrogen atoms lie in the same plane
and 2 bridging hydrogen atoms lie in the perpendicular plane.
(iii) 4 bridging hydrogen atoms and boron atoms lie in one plane and two
terminal hydrogen atoms lie in a plane perpendicular to this plane.
(iv) All the atoms are on the same plane.
Option (ii) is the answer.
A compound X, of boron, reacts with NH3 on heating to give another compound
Y which is called inorganic benzene. The compound X can be prepared by
treating BF3 with Lithium aluminium hydride. The compounds X and Y are
represented by the formulas.
Option (i) is the answer.
Quartz is extensively used as a piezoelectric material, it contains ___________.
(i) Pb
(ii) Si
(iii) Ti
(iv) Sn
Option (ii) is the answer.
The most commonly used reducing agent is
(i) AlCl3
(ii) PbCl2
(iii) SnCl4
(iv) SnCl2
Option (iv) is the answer.
Dry ice is
(i) Solid NH3
(ii) Solid SO2
(iii) Solid CO2
(iv) Solid N2
Option (iii) is the answer.
Cement, the important building material is a mixture of oxides of several
elements. Besides calcium, iron and sulphur, oxides of elements of which of
the group (s) are present in the mixture?
Option (ii) is the answer