(A) : The specific charge of Na⁺ is less than that of Mg⁺².
(R) : The relative atomic mass of Mg is greater than that of Na.

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Both ‘A’ and ‘R’ are true and ‘R’ is the correct explanation of ‘A’.

‘A’ is true but ‘R’ is false

Both 'A' and 'R' are false

Both ‘A’ and ‘R’ are true and ‘R’ is not the correct explanation of ‘A’

answer is B.

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Detailed Solution

(A)The specific charge of Na⁺ is less than that of Mg⁺².

(e/m)specific charge of Na⁺ = 1/23

(e/m)specific charge of Mg⁺²= 2/24 =1/12

(R) : The relative atomic mass of Mg is greater than that of Na.

The relative atomic mass of Mg =24

The relative atomic mass of Na =23

So both are true but not correct explanation of 'A'

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