10th Class Chemistry Second half Book Paper

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

1. In Baeyer’s test, saturated hydrocarbons show:
   1. No reaction
   2. Colourless solution
   3. Formation of precipitate
   4. Blue colouration
2. 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
3. Vitamin C supports:
   1. Digestion
   2. Collagen synthesis and immunity
   3. Red blood cells
   4. Hormone regulation
4. Which of the following is an example of a carboxylic acid?
   1. Ethanol
   2. Ethanoic acid
   3. Ethyl acetate
   4. Methanol
5. The formula of ethyne is:
   1. C₂H₆
   2. C₂H₂
   3. C₂H₄
   4. C₂H₈
6. 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
7. The general formula of alkanes is:
   1. CnH2n
   2. CnH2n+2
   3. CnH2n-2
   4. CnHn
8. Corn-based ethanol reduces greenhouse gas emissions by roughly:
   1. 10–20%
   2. 25–30%
   3. 40–50%
   4. 60–70%
9. Which vitamin is essential for blood clotting?
   1. Vitamin A
   2. Vitamin C
   3. Vitamin D
   4. Vitamin E
10. The oxidizing agents used to convert alcohols to carboxylic acids are:
    1. HCl and H₂SO₄
    2. KMnO₄ and K₂Cr₂O₇
    3. NaOH and CaO
    4. HNO₃ and NaCl
11. The IUPAC name of HCOOH is:
    1. Ethanoic acid
    2. Propanoic acid
    3. Methanoic acid
    4. Butanoic acid
12. Polymers are formed by joining together many:
    1. Ions
    2. Atoms
    3. Monomers
    4. Molecules