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Question

# An electric discharge is passed through a mixture contaning 50 cc of O2 and 50 cc of H2. The volume of the gases formed (i) at room temperature and (ii) at 1100C will be, respectively:

A
(i) 25 cc (ii) 50 cc
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B
(i) 50 cc (ii) 75 cc
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C
(i) 25 cc (ii) 75 cc
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D
(i) 75 cc (ii) 75 cc
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Solution

## The correct option is D (i) 25 cc (ii) 75 ccAt room temperature, 50 cc of hydrogen will react with 25 cc of oxygen to obtain liquid water. Thus, 25 cc of oxygen will be left behind.At 1100C, 50 cc of hydrogen will react with 25 cc of oxygen to obtain 50 cc of water vapor. Hence, the total volume of gas will be 75 cc.

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