1st Year Chemistry Chapter 16 TestLab Safety and Practical Skills

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

1. Ion gives a yellow precipitate with ammonium molybdate and nitric acid:

   1. Sulfate

   2. Carbonate

   3. Phosphate

   4. Chloride

2. ......must be neutralized before disposal.

   1. Alcohols

   2. Salts

   3. Acids and bases

   4. Water

3. A fire hazard in the lab may occur due to:

   1. Water spills

   2. Metal wires

   3. Ether vapors

   4. Plastic beakers

4. Which cation gives a white gelatinous precipitate upon the addition of aqueous ammonia?

   1. Cr³⁺

   2. Cr²⁺

   3. Zn²⁺

   4. Al³⁺

5. What is the first action in case of a chemical burn?

   1. Apply butter

   2. Rinse with cold water

   3. Use antiseptic

   4. Bandage immediately

6. Symbol indicates toxic substance:

   1. Flame

   2. Skull and crossbones

   3. Exclamation mark

   4. Gas cylinder

7. Which gas is evolved when carbonate reacts with dilute HCI?

   1. O₂

   2. CO₂

   3. SO₂

   4. NO₂

8. Phenolphthalein turns pink in:

   1. Neutral solution

   2. Acid

   3. Base

   4. Salt solution

9. The end point of a titration is when:

   1. The solution is heated

   2. The colour changes permanently

   3. Both solutions are mixed fully

   4. The burette is empty

10. Lead ions form a yellow ppt with:

    1. NaOH

    2. KI

    3. HCI

    4. AgNO₃