Class XI

Acids react with metal carbonates to form
  1. Salt, water, hydrogen gas
  2. Salt, water, CO2
  3. alt and gas only
  4. Salt and water only
 In electronic industry, silicon is used in making
  1. Microwave oven bodies
  2. Television sets
  3. Microchips
  4. Motherboards
 Same number of shells are found in elements of
  1. Same group
  2. Same period
  3. Same type
  4. Same mass number
Hydroxonium ions (H3O+)
  1. Can only exist in water
  2. Are highly ionic
  3. Are highly covalent
  4. Both A and B
Examples of conductors include
  1. Mercury
  2. Diamond
  3. Sulphur
  4. Phosphorus
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