10th Class Chemistry Full Book Paper

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

1. Which insoluble base reacts with H₂SO₄ to produce copper(II) sulphate?
   1. CaCO₃
   2. CuO
   3. NaOH
   4. Zn
2. The formula of ethyne is:
   1. C₂H₆
   2. C₂H₂
   3. C₂H₄
   4. C₂H₈
3. Which of the following is NOT a factor affecting the rate of reaction according to collision theory?
   1. Number of particles per unit volume
   2. Activation energy
   3. Presence of a catalyst
   4. Molar mass of reactants
4. Which of the following represents Avogadro’s law?
   1. V ∝ n
   2. V ∝ P
   3. V ∝ T
   4. PV = constant
5. The catalyst used in the Contact Process is:
   1. Iron oxide
   2. Vanadium pentoxide
   3. Nickel
   4. Platinum
6. In Baeyer’s test, saturated hydrocarbons show:
   1. No reaction
   2. Colourless solution
   3. Formation of precipitate
   4. Blue colouration
7. Alcohol swabs are commonly used to disinfect the skin:
   1. After meals
   2. Before injection or surgery
   3. During exercise
   4. For cosmetic use only
8. 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.
9. One mole of $H_2O$ has a mass of:
   1. 10 g
   2. 18 g
   3. 16 g
   4. 23 g
10. Which of the following is an example of a carboxylic acid?
    1. Ethanol
    2. Ethanoic acid
    3. Ethyl acetate
    4. Methanol
11. Which of the following best defines polymers?
    1. Small molecules bonded together to form large molecules
    2. Large molecules built up from many smaller molecules called monomers
    3. Simple molecules consisting of one type of atom
    4. Large molecules made up of metals and non-metals
12. 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