Class XII

Hydrogen sulphide reacts with lead acetate forming a black compound which reacts with hydrogen peroxide to form another compound. The colour of the compound is
  1. Yellow
  2. Pink
  3. White
  4. Black
N2O3 is
  1. A neutral oxide and the anhydride of HNO3
  2. An acidic oxide and an anhydride of HNO2
  3. A basic oxide and the anhydride of HNO2
  4. An acidic oxide and the anhydride of H2N2O2
Which of the following is prepared by cyanamide process?
  1. Urea
  2. Cyanamide
  3. Nitrogen
  4. Ammonia
Elements of which group are known as ore forming elements?
  1. Group 15
  2. Group 17
  3. Group 18
  4. Group 16
Which of the following oxides reacts with both HCl and NaOH?
  1. ZnO
  2. N2O5
  3. CO2
  4. CaO
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