Chemistry Class-11: Chapter –11. The p-Block Elements Part – 2
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Question: 10
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 in the same plane.
Answer: (ii)
Question: 11
A compound X, of boron reacts with on heating to give another compound Y which is called inorganic benzene. The compound X can be prepared by treating with Lithium aluminium hydride. The compounds X and Y are represented by the formulas.
(i)
(ii)
(iii)
(iv)
Answer: (i)
Question: 12
Quartz is extensively used as a piezoelectric material, it contains ___________.
(i)
(ii)
(iii)
(iv)
Answer: (ii)
Question: 13
The most commonly used reducing agent is
(i)
(ii)
(iii)
(iv)
Answer: (iv)
Question: 14
Dry ice is
(i) Solid
(ii) Solid
(iii) Solid
(iv) Solid
Answer: (iii)
Question: 15
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?
(i) Group 2
(ii) Groups 2, 13 and 14
(iii) Groups 2 and 13
(iv) Groups 2 and 14
Answer: (ii)
II. Multiple Choice Questions (Type-II)
In the following questions two or more options may be correct.
Question: 16
The reason for small radius of compared to Al is _______.
(i) Poor screening effect of d and f orbitals
(ii) Increase in nuclear charge
(iii) Presence of higher orbitals
(iv) Higher atomic number
Answer: (i), (ii)
Question: 17
The linear shape of is due to _________.
(i) Hybridization of carbon
(ii) Hybridization of carbon
(iii) pπbonding between carbon and oxygen
(iv) Hybridisation of carbon
Answer: (ii), (iii)