Q1 of 152 Page 45

What type of reaction is represented by the digestion of food in our body?

Decomposition Reaction is represented by digestion of food in our body.

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54 The white solid compound A decomposes quite rapidly on heating in the presence of a black substance X to form a solid compound B and a gas C. When an aqueous solution of compound B is reacted with silver nitrate solution, then a white precipitate of silver chloride is obtained along with potassium nitrate solution. Gas C does not burn itself but helps burn other things.

(a) What is compound A?


(b) What is compound B?


(c) What is gas C?


(d) What do you think is the black substance X? What is its function?


(e) What is the general name of substances like X?

 55 Gas A, which is the major cause of global warming, combines with hydrogen oxide B in nature in the presence of an environmental factor C and a green material D to form a six carbon organic compound E and a gas F. The gas F is necessary for breathing.

(a) What is gas A?


(b) What is the common name of B?


(c) What do you think could be C?


(d) What is material D? Where is it found?


(e) Name the organic compound E.


(f) What is gas F? Name the natural process during which it is released?

 2 Name the various types of chemical reactions. 3 Why does the colour of copper sulphate solution change when an iron nail is kept immersed in it ?