Question

Assertion (A): In triad, the three elements have same gaps of atomic masses.
Reason (R): Elements in a triad have similar properties.

(i) Both (A) and (R) are true and (R) is the correct explanation of (A).

(ii) Both (A) and (R) are true, but (R) is not the correct explanation of (A),

(iii) (A) is true but (R) is false,

(iv) (A) is false but (R) is true​

Answer 1

Answer:

(ii)  Both (A) and (R) are true, but (R) is not the correct explanation of (A)

Explanation:

Triads have the same gaps in atomic masses but elements in triads do not have similar properties due to this reason. That is why the triad system for the classification of elements was rejected!