Question

1.
A metal M is stored under Kerosene. It vigorously catches fire, if a small piece of this metal is kept
open in air. Dissolution of this metal in water releases great amount of energy and the metal
catches fire. The solution so formed turns red litmus blue,
a) Name the metal M
b) Write formula of the compound formed when this metal is exposed to air,
c) Why is metal 'M' stored under kerosene?
d) If oxide of this metal is treated with hydrochloric acid, what would be the products?
e) Write balanced equations for
i) Reaction of M with air
ii) Reaction of M with water
iii) Reaction of metal oxide with hydrochloric acid,​

Answer 1

a) Sodium (Na)

b) Na2O

c) Sodium metal is stored in kerosene oil in order to prevent it from coming in contact with oxygen and moisture otherwise it explodes .

d) NaCl (Salt) and H2O (water)

e) 1) 4Na + O2 -> 2Na2O

2) Na2O + H2O -> 2NaOH

3) Na2O + 2HCl -> 2NaCl + H2O

:-)