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JEE Advanced levelSingle correct optionDifficulty 3 of 3pb161

Assertion (A): is a high-melting solid whereas is a gas. Reason (R): Silicon forms strong - double bonds with oxygen, just as carbon does.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: C

A is true: is a giant covalent network of Si-O single bonds, whereas is a discrete O=C=O molecule. R is false: Si, being larger, forms poor - overlap, so it prefers four Si-O single bonds.
Practice p-Block Elements: Groups 13 and 14 More on Silicon compounds: silicates, silicones, zeolites

More questions on Silicon compounds: silicates, silicones, zeolites