Question

Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	Used as lubricant	(i)	Carbon dioxide
(B)	Oxide with three dimensional structure	(ii)	Graphite
(C)	Used in solar calls	(iii)	Silica
(D)	Anhydride of carbonic acid	(iv)	Silicone

• A. $\left(A\right)\to \left(iv\right),\left(B\right)\to \left(iii\right),\left(C\right)\to \left(ii\right),\left(D\right)\to \left(i\right)$
• B. $\left(A\right)\to \left(iv\right),\left(B\right)\to \left(i\right),\left(C\right)\to \left(iii\right),\left(D\right)\to \left(ii\right)$
• C. $\left(A\right)\to \left(iii\right),\left(B\right)\to \left(ii\right),\left(C\right)\to \left(i\right),\left(D\right)\to \left(iv\right)$
• D. $\left(A\right)\to \left(ii\right),\left(B\right)\to \left(iii\right),\left(C\right)\to \left(iv\right),\left(D\right)\to \left(i\right)$

Answer 1

Answer: (D)

$\left(A\right)\to \left(ii\right),\left(B\right)\to \left(iii\right),\left(C\right)\to \left(iv\right),\left(D\right)\to \left(i\right)$

Answer:-

(A) Used as a lubricant $\to$ Graphite is a mineral made of loosely bonded sheets of carbon atoms, giving it a slippery texture that makes it a very effective lubricant. $\Rightarrow \left(i\right)\text{Graphite}$

(B) Oxide with three-dimensional structure $\to$ The Si atoms have a tetrahedral configuration and are sp3 hybridized. Oxygen has 6 valence electrons and uses just two to form the two $Si:O$ bonds. Thus silica has 3-D structure. $\left(iii\right)\text{Silica}$

(C) Used in solar cells $\to$ Silicon is a semiconductor material. When it is doped with the impurities gallium and arsenic its ability to capture the sun's energy and convert it into electricity is improved considerably. Thus used in solar cells. $\Rightarrow \left(iv\right)\text{Silicone}$

(D) Anhydride of carbonic acid $\to$ Anhydrides of inorganic acids are usually oxides of non-metallic elements. Thus Carbon dioxide, $C{O}_2$, is the anhydride of carbonic acid, $H_{2}C{O}_3.\left(i\right)\text{Carbon dioxide}$