Chemistry
Assertion (A): Reduction is defined as the process of removal of oxygen from a substance or the addition of hydrogen to a substance.
Reason (R): Hydrogen is a reducing as well as an oxidising 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
A is true but R is false.
Explanation — Reduction is also defined as the process that involves removal of oxygen from a substance or the addition of hydrogen to a substance. Hence, the assertion (A) is true.
Hydrogen is a reducing agent not oxidising agent. Hence, the reason (R) is false.
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Related Questions
Assertion (A): Zinc, lead and aluminium are unique metals.
Reason (R): Zinc, lead and aluminium all have the same valency.
- 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): Zinc is preferred for the laboratory preparation of hydrogen.
Reason (R): Zinc is unique in nature and does not contain any 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.
Choose terms from the options given in brackets to complete these sentences.
(a) When CuO reacts with hydrogen, …………… is reduced to …………… and …………… is oxidized to …………… . (CuO, H2, Cu, H2O)
(b) Hydrogen is …………… soluble in water. (sparingly, highly, moderately)
(c) Metals like ……………, …………… and …………… give H2 with steam. (iron, magnesium, aluminium, sodium, calcium)
(d) Sodium …………… reacts smoothly with cold water. (metal, amalgam, in the molten state)
(e) A metal …………… hydrogen in the activity series gives hydrogen with …………… acid or …………… acid. (above, below, dilute hydrochloric, concentrated hydrochloric, dilute sulphuric).
Name
(a) an oxidizing agent that does not contain oxygen.
(b) a substance that oxidizes concentrated HCl to chlorine.
(c) a substance that will reduce aqueous Iron (III) ions to Iron (II) ions.
(d) a liquid that is an oxidizing as well as a reducing agent.
(e) a gas that is an oxidizing as well as a reducing agent.
(f) a solid that is an oxidizing agent.