Chemistry
Assertion (A): While preparing hydrogen in laboratory, no leakage of gas should take place and no flame must be present near the apparatus.
Reason (R): Hydrogen-air mixture burns with a characteristic pop sound.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Hydrogen
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Answer
Both A and R are true but R is not the correct explanation of A.
Explanation — While preparing hydrogen in laboratory, no leakage of gas should take place and no flame must be present near the apparatus because the mixture of hydrogen and air explodes violently when it is brought near a flame. Hence assertion (A) is true.
When hydrogen is pre-mixed with air or oxygen, it explodes with a pop sound. Hence reason (R) is true.
But reason (R) does not explain why no leakage of gas and no flame must be maintained in laboratory. Hence reason (R) is not correct explanation of assertion (A).
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