Question

16. What happens when calcium is treated with water?
(a) It does not react with water
(b) It reacts violently with water.
(c) It reacts less violently with water
(d) Bubbles of hydrogen gas formed stick to the surface of calcium. ?
(a) () and (iv)
(b) (i) and (iii)
(c) (i) and (ii)
(d) (iii) and (iv)
17 Which one of the following four metals would be displaced from the solution of its salts by other three metals?
(a) Mg
(b) Ag
(c) Zn
(d) Cu
18Generally, non-metals are not conductors of electricity. Which of the following is a good conductor of electricity?
(a) Diamond
(b) Graphite
(c) Sulphur
(d) Fullerene​

Answer 1

Answer:

16 (c) It reacts less violently with water

17 (b) Ag

18 (b) Graphite

Answer 2

$\sf \frak \red{Answer:-}$

16) bubbles of hydrogen gas formed

17) Cu

18) Graphite