10th Class Chemistry 1st Quarter Book Paper

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

1. One mole of $H_2O$ has a mass of:
   1. 10 g
   2. 18 g
   3. 16 g
   4. 23 g
2. What does a small standard error (e.g., 0.1°C) show?
   1. That the value is uncertain
   2. That the average value is accurate
   3. That data is not useful
   4. That the experiment should be redone
3. Which of the following does not involve an electrolytic process?
   1. Refining of copper
   2. Manufacture of Sodium from NaCl
   3. Electroplating of steel
   4. Reduction of metal oxide by a reducing agent.
4. Which of the following represents Avogadro’s law?
   1. V ∝ n
   2. V ∝ P
   3. V ∝ T
   4. PV = constant
5. A solution has a strength of 50 g/dm³. Expressed in g/cm³ it is:
   1. 0.05 g/cm³
   2. 0.5 g/cm³
   3. 5 g/cm³
   4. 0.005 g/cm³
6. What did the Phlogiston Theory try to explain?
   1. Atomic structure
   2. Radioactivity
   3. Burning (combustion) and rusting
   4. Energy level
7. The cathode always produces which gas in both dilute and concentrated halide solutions?
   1. Oxygen
   2. Hydrogen
   3. Chlorine
   4. None
8. Drug diffusion rate depends on:
   1. Volume of container only
   2. Pressure alone
   3. Concentration gradient
   4. Shape of drug molecules
9. The yield actually obtained from a reaction is called:
   1. Theoretical yield
   2. Practical yield
   3. Actual yield
   4. Experimental yield
10. Confidence intervals show:
    1. How hot a substance is
    2. How much data varies
    3. How precise a measurement is
    4. The probability of being wrong
11. Which of the following converts chemical energy into electrical energy?
    1. Electrolytic cell
    2. Galvanic cell
    3. Both a & b
    4. None of these
12. The latent heat of fusion is associated with which phase change?
    1. Solid to liquid
    2. Liquid to gas
    3. Gas to liquid
    4. Solid to gas