Which of the following is false for Silica Gel Can be p

Which of the following is false for Silica Gel?

Can be prepared by dehydrating silicic acid.

Can be prepared by action of water on silicon tetraflouride

Used as a catalyst in petroleum industry.

None of these

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Silica gel which is an amorphous form of silica can be prepared by:

By the action of water on silicon tetra-fluoride or tetrachloride

$S i C l_{4} + 4 H_{2} O \to S i O_{2} .2 H_{2} O + 4 H C l$

Silica gel

By the action of acid (HCl) on soluble sodium silicate white gelatinous precipitate of silica gel is obtained.

$N a_{2} S i O_{3} + 2 H C l + H_{2} O \to S i O_{2} .2 H_{2} O + 2 N a C l$

By dehydrating silicic acid

$S i (O H)_{4 (a q)} \to S i O_{2} .2 H_{2} O$

Silicic acid

Silica gel is amorphous and very porous. It contains about 4% water and is used

As a catalyst in petroleum industry and as an absorbent in column chromatography.