Question

1. What is the colour of the powder collected in a watch glass ?

(i) White

(ii) Grey

(iii) Black

(iv) Brown

2. Which type of change occurs in the above experiment ?

(i) Physical

(ii) Chemical

(iii) No change

3. What is the chemical name of the powder collected in a watch glass?

(i) Magnesium Sulphide

(ii) Magnesium Peroxide

(iii) Magnesium Oxide

(iv) None of the above

4. Which of the following determines the occurrence of a chemical reaction?

(i) Change in state

(ii) Change in colour

(iii) Change in temperature

(iv) All of the above

Answer 1

1. (i) White

2. (ii) Chemical

3. (iii) Magnesium Oxide

4. (iv) All of the above

5. (ii) FALSE