1st Year Chemistry Chapter 12 TestNitrogen and Sulfur

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

1. Nitrosomonas helps in conversion of:

   1. NO₄^- to NO₂^-

   2. NO₄⁺ to NO₂^-

   3. NO₄^- to N₂

   4. N₂ to NO₃^-

2. The role of vanadium(V) oxide (V₂O₅) in the Contact Process is:

   1. Purifying gas

   2. Absorbing water

   3. Acting as catalyst

   4. Neutralizing acid

3. Vehicles tested near a smog-prone area show higher emissions of:

   1. O₂ and H₂

   2. NO and NO₂

   3. H₂O and CO₂only

   4. Argon and helium

4. A technician uses SF₆ gas in a high-voltage circuit breaker. What property of this gas makes it suitable?

   1. It is flammable

   2. It is an oxidizing agent

   3. It is inert and insulates well

   4. It is a good conductor

5. What is the chemical formula of ammonia?

   1. NH₄

   2. NH₃

   3. NO₂

   4. N₂O

6. The reduction of NO by CO in a catalytic converter produces:

   1. NO₂

   2. N₂ and CO₂

   3. CO only

   4. NO and H₂O

7. During the Contact Process, production slows due to catalyst poisoning. What might be the cause?

   1. Low air pressure

   2. Dust and arsenic in SO? gas

   3. Too much water in absorption

   4. Excess temperature

8. What is the atomic number of sulfur?

   1. 14

   2. 16

   3. 18

   4. 20

9. The catalytic converter works efficiently only when it reaches:

   1. 0°C

   2. 100°C

   3. 200°C

   4. 300-400°C

10. In a lab, a student adds zinc to cold dilute H₂SO₄ What gas will be observed?

    1. CO₂

    2. H₂

    3. SO₂

    4. O₂