Ncert Exercises & Solutions

Given below are two statements:

Assertion (A):	Some metals like platinum and palladium, can be used as storage medium for hydrogen.
Reason (R):	Platinum and palladium can absorb large volumes of hydrogen.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: Platinum and palladium can absorb large volumes of hydrogen.

Transition metal and their compound are known for their catalytic activity because
(i) show variable oxidation state
(ii) Provide a large surface area with vacant space.

Since metals, Pd and Pt are d block element and acts as a catalyst. They provide a large surface area for the adsorption large volume of hydrogen, hence, these are used as storage media for it.

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