Class XI

K2O + H2O →
  1. K(OH)3
  2. KOH
  3. KOH.H2O
  4. KO + H2 + O2
When an acid (H+) is added to alkali (OH-), product is
  1. hydroxides
  2. water
  3. salts
  4. hydrogen gas
Giant crystal lattices are only formed in
  1. Ionic compounds
  2. Covalent compounds
  3. Metallic compounds
  4. Dative bond
In Na2CO3.10H2O, percentage of sodium is
  1. 0.1678
  2. 0.1608
  3. 0.1659
  4. 0.1684
Valency of Carbon (C) is
  1. 1
  2. 2
  3. 3
  4. 4
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