1st Year Chemistry 2nd Quarter Book Paper

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

1. The activation energy for a reaction can be:
   1. Increased by increasing temprature
   2. Increased by decreasing temprature
   3. Decreased by increasing concentration of reactants
   4. None of these
2. As we go down Group 1, ionization energy:
   1. Increases
   2. Decreases
   3. Remains same
   4. Becomes irregular
3. Which halogen has greenish yellow colour?
   1. $F_2$
   2. $Cl_2$
   3. $Br_2$
   4. $I_2$
4. A reversible reaction is one in which:
   1. Reactants completely convert into products
   2. Products cannot react further
   3. Products react to form reactants again
   4. Reaction occurs only in one direction
5. In a catalytic converter, NO reacts with CO to form:
   1. CO₂ + H₂O
   2. N₂ + CO₂
   3. NH₃ + CO
   4. NO₂ + C
6. The common ion effect occurs when:
   1. Two strong acids are mixed
   2. Two salts are decomposed
   3. Two bases are neutralized
   4. Two compounds produce the same ion in solution
7. In a graph of concentration vs. time, the slope of the curve represents:
   1. Activation energy
   2. Rate of reaction
   3. Temperature
   4. Pressure
8. The oxide of chlorine (Cl₂O₇) is:
   1. Basic
   2. Weakly acidic
   3. Strongly acidic
   4. Amphoteric
9. The thermal stability of hydrogen halides decreases in the order:
   1. HI > HBr > HCl > HF
   2. HF > HCl > HBr > HI
   3. HCl > HF > HBr > HI
   4. HI > HCl > HBr > HF
10. The oxidation of SO₂ to SO₃ is:
    1. Endothermic
    2. Exothermic
    3. Neutral
    4. Reversible only at high temperature
11. Sulphuric acid acts as a dehydrating agent because it:
    1. Contains water
    2. Removes water from compounds
    3. Forms crystals easily
    4. Produces oxygen
12. When air is bubbled through pure water, the pH is lowered from 7.0 to 5.6, which gas in the air is responsible for this change.
    1. Argon
    2. Carbon dioxide
    3. Nitrogen
    4. Oxygen