Question

When the solid A is added to water, it dissolves with the
evolution of a lot of heat and making little explosions to
form two products B and C. The properties of products B
and C are entirely different from those of solid A as well
as water. Moreover, products B and C cannot be
reconverted into solid A and water. When another solid D
is added to water, it dissolves with absorption of a little
heat of form a product E which cools down. The product
E shows the properties of both, solid D as well as water.
Moreover, product E can be converted into solid D and

Answer 1

Answer:

(a) An irreversible chemical change occurs when solid A dissolves in water.

(b) A reversible physical change occurs when solid D is dissolved in water.

(c) Sodium could be the compund A with NaOH and H2 being final products.

(d) Solid D can be Zinc, existing in a coordination complex with water in the form of [Zn(H2O)6]+.

(e) The dissolved Zinc can be recovered by simply evaporating the water or by more complex processes like 'ion exchnage'

Answer 2

Explanation:

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