Class XI

CuO + H2SO4 → CuSO4. other by product is
  1. Water
  2. Hydrogen gas
  3. Oxygen gas
  4. Copper crystals
Sea water has a pH of
  1. 5
  2. 8
  3. 9
  4. 11
Optimal temperature for enzymes is
  1. Room temperature
  2. 35-37 °C
  3. 40-45 °C
  4. above 45 °C
Distilled water is an example of
  1. Strong electrolyte
  2. Non-electrolyte
  3. Weak electrolyte
  4. Catalyst
Molar mass of urea NH2CONH2 is
  1. 59.51g/mol
  2. 5 5.89g/mol
  3. 60.055 g/mol
  4. 5.32g/mol
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