Observations Quiz with Answers PDF Download – Test 53

MCQ 261: A salt on heating in a test tube produces cracking sound. The salt may be:

1. KCl
2. CuCO₃
3. Na₂S
4. ZnCO₃

MCQ 262: The efficiency of a chemical reaction can be checked by calculating its:

1. Actual Yield
2. Experimental yield
3. Theoretical yield
4. Percentage yield

MCQ 263: A substance that promotes the activity of a catalyst is called:

1. Poison
2. Activator
3. Inhibitor
4. Auto catalyst

MCQ 264: For alkali burns, wash with plenty of water and then with:

1. 10 % Acetic acid solution
2. 1 % Acetic acid solution
3. 20 % Acetic acid solution
4. 30 % Acetic acid solution

MCQ 265: The compound with the largest values of heat capacity is:

1. Solid
2. Liquid
3. Gas
4. All of above