Question

-What property of hydrogen is observed in the following experiments
(i) Balloon, filled with hydrogen, floats.
(ii) Pop sound is heard when a burning splint is introduced at the mouth of hydrogen filled jar.
(iii) When black cupric oxide is heated in a stream of hydrogen, reddish colour is obtained .

-Give reasons for the following
(i) Silicon counts among metalloids
(ii) Carbon is not used for making aluminium from aluminium oxide
(iii) For making hydrogen by reaction with hydrochloric acid, granulated zinc is preferred to a block of zinc.Solution

-Do ionic compounds conduct electricity in all physical states ? Explain


-Why do ionic compounds have high M.P and B.P

Answer 1

Answer:

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