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 B cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to 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 water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A.Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
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(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'
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