10th Class Chemistry Chapter 7 Test07. Nitrogen, Sulphur and Metals

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. The catalyst used in the Contact Process is:
   1. Iron oxide
   2. Vanadium pentoxide
   3. Nickel
   4. Platinum
2. Which oxide reacts with water to form carbonic acid (H₂CO₃)?
   1. SO₂
   2. CO₂
   3. CaO
   4. Na₂O
3. The Contact Process is used for the manufacture of:
   1. Nitric acid
   2. Sulphuric acid
   3. Hydrochloric acid
   4. Acetic acid
4. Which gas reacts with oxygen to form nitrogen dioxide (NO₂)?
   1. N₂
   2. NO
   3. CO₂
   4. O₃
5. The ratio of nitrogen to hydrogen used in the Haber process is:
   1. 0.042361111111111
   2. 0.043055555555556
   3. 0.04375
   4. 0.085416666666667
6. Which metals form protective oxide layers preventing further oxidation?
   1. Sodium and potassium
   2. Aluminium and zinc
   3. Copper and gold
   4. Iron and silver
7. The overall role of NOx in acid rain is:
   1. To neutralize acids
   2. To catalyse the oxidation of SO₂ to H₂SO₄
   3. To reduce sulphur content in the air
   4. To absorb sunlight
8. The process of converting SO₂ to SO₃ is:
   1. Endothermic
   2. Exothermic
   3. Neutral
   4. Reversible and endothermic
9. The final product formed in photochemical smog is:
   1. SO₂
   2. CO₂
   3. PAN
   4. HNO₃
10. Nitric oxide (NO) is primarily produced during:
    1. Photosynthesis
    2. Rainwater dissolution
    3. Industrial and combustion processes
    4. Soil erosion