9th Class Chemistry Chapter 18 Test18. Qualitative Analysis

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

1. Which gas turns lime water milky?
   1. ammonia
   2. carbon dioxide
   3. oxygen gas
   4. sulphur dioxide gas
2. Which gas turns starch iodide paper blue-black?
   1. ammonia
   2. carbon dioxide
   3. chlorine gas
   4. oxygen gas
3. Electrons of alkali metals excite by absorbing the light in:
   1. Visible wavelength
   2. UV wavelength
   3. IR wavelength
   4. Radio wavelength
4. Which gas has a pungent smell similar to bleach?
   1. ammonia
   2. carbon dioxide
   3. chlorine gas
   4. hydrogen gas
5. Which gas is known to turn moist blue litmus paper red?
   1. ammonia
   2. carbon dioxide
   3. chlorine gas
   4. oxygen gas
6. The colour imparted by the flame of sodium metal is:
   1. Blue
   2. Green
   3. Golden yellow
   4. Purple
7. Which gas can be detection by its distinctive choking smell?
   1. ammonia
   2. carbon dioxide
   3. chlorine gas
   4. hydrogen gas
8. Which guess turns the lime water, milky?
   1. Carbon monoxide
   2. Carbon dioxide
   3. Sulphur dioxide
   4. Oxygen
9. Ammonia is a gas:
   1. Acidic
   2. Basic
   3. Neutral
   4. Amphoteric
10. Which gas helps in combustion process?
    1. Oxygen
    2. Nitrogen
    3. Sulphur dioxide
    4. Carbon dioxide