Q. 685.0( 1 Vote )

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 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 sold 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.

Answer :

(a) Chemical change; Because the properties of products B and C are entirely different from those of solid A and water

(b) Physical change; Because the product E shows the properties of both, solid D and water


(c) Sodium; Sodium hydroxide and Hydrogen


(d) Ammonium chloride


(e) Evaporation


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PREVIOUSThree mixtures A, B and C are obtained by stirring three different solids in water taken in separate beakers. When mixture A is allowed to stand for some time, then its particles settle at the bottom of the beaker. When a beam of light is passed through mixture A in a dark room, the path of light becomes visible when observed from the side of the beaker. When mixture B is allowed to stand for a considerable time, even then its particles do not settle down. Mixture B, however, scatters the beam of light just like mixture A. The particles of mixture C do not settle down on keeping and it also does not scatter a beam of light passing through it.(a) What are the mixtures like A known as?(b) What are the mixtures like B known as?(c) What are the mixtures like C known as?(d) Name the phenomenon exhibited by A and B which occurs on passing a beam of light through them.(e) Name one mixture each which is like (i) A (ii) B, and (iii) C.NEXT100 ml of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker. The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.(a) What name is given to solutions like X?(b) What name is given to solution like Y?(c) What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice? Why?(d) What term is used to denote the amount of solid dissolved in 100 grams of water in a solution like Y?
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