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 water.
i) A chemical change occurs when solid A is dissolved in water
ii) A physical change occurs when solid D is dissolved in water
iii) Metal sodium could behave like solid A
iv) Metal sodium and E is a mixture
Which of the following are correct for the above process

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i, ii

iii, iv

ii, iii

All

answer is D.

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Detailed Solution

i) When solid A is dissolved in water, chemical change takes place this is because the properties of products B and C are entirely different from those of solid A and water.
ii) Physical change occurs when solid D is dissolved in water. This is because product E shows the products of both solid D and water.
iii) Sodium metal could behave like solid A product B is sodium hydroxide, product C is hydrogen.
iv) Solid D is Ammonium chloride
v) D can be recovered from E by evaporation.

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