Question

12 g of Mg (at. Mass 24) will react completely with acid to give
A. (a)One mole of `H_(2)`
B. (b)`1//2` mole of `H_(2)`
C. (c )`2//3` mole of `O_(2)`
D. (d)Both `1//2` mol of` H_(2)` and `1//2`mol of` O_(2)`

Answer 1

Correct Answer - B
`Mg^(+2)=H_(2)`
`n=(12g)/(24g)=1/2` mole of `H_(2)`