Chemistry
Assertion (A): Hydrogen is used for the extraction of less reactive metals like copper and lead.
Reason (R): Hydrogen is a good reducing agent.
- 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 — A is true, when hydrogen gas is passed over hot metallic oxides of copper, lead, iron, etc., it removes oxygen from them and thus reduces them to their corresponding metals.
R is true as hydrogen acts as a good reducing agent.
Therefore, Both A and R are true and R is the correct explanation of A is the correct option.
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Related Questions
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.
Assertion (A): Oxyhydrogen flame is used for cutting and welding metals.
Reason (R): For cutting and welding metals, a low temperature is required.
- 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.
Fill in the blanks:
(a) Hydrogen is …………… than air.
(b) Hydrogen is …………… soluble in water.
(c) Hydrogen burns with a …………… flame and …………… sound is heard.
(d) A metal …………… hydrogen in the reactivity series gives hydrogen with …………… .
(e) Hydrogen reacts with metal oxides to form …………… and …………… .
(f) Oxidation is the removal of …………… or addition of …………… .
(g) In redox reactions, oxidation and reduction occurs …………… .