Chemistry
Assertion (A): On the earth, hydrogen is mostly found in the form of compounds.
Reason (R): Hydrogen is a highly reactive element.
- 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 and R is the correct explanation of A.
Explanation — Hydrogen readily reacts with other elements, especially oxygen, to form compounds like water, and with metals as well. This reactivity is one of the reasons it is mostly found in compounds.
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Hydrogen is
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- supporter of combustion
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Assertion (A): In the laboratory preparation of hydrogen, granulated zinc is reacted with dilute acid.
Reason (R): Granulated zinc contains copper as an impurity.
- 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.
Assertion (A): Pure hydrogen burns with a pop sound in air.
Reason (R): Hydrogen forms an explosive mixture with air.
- 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.