Question

Match the items in column I with its main use in column II:

Column I	Column II
A. Silica Gel	Transistor
B. Silicon	Ion Exchanger
C. Silicone	Dry Agent
D. Silicate	Sealant

A. (A)-(iv), (B)-(i), (C)-(ii), (D)-(iii)

B. (A)-(iii), (B)-(i), (C)-(iv), (D)-(ii)

C. (A)-(ii), (B)-(i), (C)-(iv), (D)-(iii)

D. (A)-(ii), (B)-(iv), (C)-(i), (D)-(iii)

Answer 1

Silicon is a naturally occurring chemical element, whereas silicone is a synthetic substance. Silicon readily bonds with oxygen and is rarely found in nature in its pure form.

Complete step by step answer:
A. Silica gel is a good dehydrating agent. It is used as a dehydrating agent. It is used to absorb moisture. Silica gel is often described as "absorbing" moisture, which may be appropriate when the gel's microscopic structure is ignored, as in silica gel packs or other products.

B. Silicon is used in transistors as it is a semiconductor. A semiconductor works when the electrons and the openings begin moving over the two intersections between the n-type and p-type silicon. ... By transforming a little information current into an enormous yield current, the semiconductor demonstrations like a speaker. In any case, it additionally acts like a switch simultaneously.

C. Silicon is a good resistance to heat, water. So it was used as a sealant to seal some elements. In contrast to different glues, silicone keeps its versatility and security in both high and low temperatures. Besides, silicone sealant is impervious to different synthetics, dampness, and enduring. ... In contrast to certain glues, silicone sealants must fix. Relieving silicone fundamentally implies allowing it to dry.

D. Silicate including zeolites used in ion-exchange beds in domestic and commercial water purification, softening and other applications.

**Hence, the correct option is B. (A)-(iii), (B)-(i), (C)-(iv), (D)-(ii)

Note:**
Silica exists in nine distinctive translucent structures or polymorphs with the three fundamental structures being quartz, which is by a long shot the most widely recognized, tridymite and cristobalite. It additionally happens in various cryptocrystalline structures.