Class XI

If atoms attain stability by sharing electron, it is referred to as
  1. Ionic bonds
  2. Covalent bonds
  3. Metallic bonds
  4. Dative bond
 Weak acids include
  1. H2CO3
  2. H2SO3
  3. H2SO4
  4. Both A and B
CuO + H2SO4 → CuSO4. other by product is
  1. Water
  2. Hydrogen gas
  3. Oxygen gas
  4. Copper crystals
Optimal temperature for enzymes is
  1. Room temperature
  2. 35-37 °C
  3. 40-45 °C
  4. above 45 °C
Chemical formula of aluminum oxide is
  1. Al2O3
  2. AlO4
  3. Al2O5.H2O
  4. Al2O5
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