These questions contains, Statement I (assertion) and Statement II (reason). (A) Statement-I is ...

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These questions contains, Statement I (assertion) and Statement II (reason).
(A) Statement-I is true, Statement-II is true ; Statement-II is correct explanation for Statement-I.
(B) Statement-I is true, Statement-II is true ; Statement-II is NOT a correct explanation for statement-I
(C) Statement-I is true, Statement-II is false
(D) Statement-I is false, Statement-II is true
- Statement-I : The average mass of one Mg atom is \( 24.305 \mathrm{amu} \), which is not the actual mass of one Mg atom.
Because
Statement-II : Three isotopes, \( { }^{24} \mathrm{Mg},{ }^{25} \mathrm{Mg} \) and \( { }^{26} \mathrm{Mg} \), of \( \mathrm{Mg} \) are found in nature.
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