Question

The table shows the reaction of different metals with water S. No. Metals Reaction with water Reaction with steam 1 E None Mild 2 F Mild Vigorous 3 G Very slow Vigorous 4 H Vigorous Violent a) Arrange the metals in the order of increasing reactivity. b) Identify ‘G’. c) Which metal can displace ‘G’ from its salt solution? (i) E (ii) F (iii) H (iv) Both F and H d) Which metal is likely to be displaced by ‘G’? (i) E (ii) F (iii) G (iv) H

Answer 1

a)  K > Mg > Cu > Ag

b) Magnesium

c) Both F

d) (iv)

Explanation:

The metals in the choices have the following reactivity: K > Mg > Cu > Ag. Magnesium reacts quickly with steam but takes a long time with water. As a result, X is magnesium. Magnesium reacts very little with cold water. It slowly interacts with hot water to produce magnesium hydroxide and hydrogen, which is mildly soluble.

Magnesium produces white magnesium oxide and hydrogen gas when it is burned in steam. With cold water, a very clean magnesium ribbon exhibits a very minor response. After a few minutes, few hydrogen bubbles emerge on its surface, and the magnesium ribbon coil normally floats to the top.