A compound obtained by burning of an element belongs to `2^(nd)` group and `3^(rd)` period when passes through red litmus paper it turns blue the equivalent weight of compounds is :
| A. |
58 |
| B. |
29 |
 |
| C. |
116 |
| D. |
14.5 |
Element belongs to `2^(nd)` group and `3^(rd)` period is Mg. Mg on buring in air given MgO whose aqueous solution is basic in nature due to formation of `Mg(OH)_2` . Molecular mass of `Mg(OH)_2` = 24 + 17 × 2 = 24+ 34 = 58
Equivalent weight of `Mg(OH)_2 = 58/2 =29`