Question

3. Which of the following can be reversed?
(a) water into ice
(b) nails becoming rusty
(c) bread turning moudly
(d) paper into ash
4. Name the chemical change
(a) lifting up a chair
(b) filling a glass
(c) cooking of rice
(d) bursting a balloon
5. The gas that turns lime water milky is:
(a) sulphur dioxide
(b) nitrogen dioxide
(C) hydrogen chloride
(d) carbon dioxide
ng
6. Impure copper sulphate powder can be
purified by the process of:
(a) galvanization
(e) evaporation
(b) crystallization
(d) all of the above​

Answer 1

Answer:

3 (a)

Explanation:

water can be reversed into ice and ice into water