Question

Identify $A$ and $B$ in the following reaction.

$A+B\to MgC{l}_2\left(aq\right)+2H_{2}O\left(l\right)$

• A. $Mg(OH{)}_2$(s) + $2H_{2}S{O}_4\left(aq\right)$
• B. $Mg\left(OH{)}_2\right(s)$ + $2HCl\left(aq\right)$
• C. $MgOH\left(s\right)$ + $2HCl\left(aq\right)$
• D. None of the above

Answer 1

The correct option is B $Mg\left(OH{)}_2\right(s)$ + $2HCl\left(aq\right)$

Acid gets neutralized when it reacts with a metal oxide to give salt and water.
Magnesium hydroxide + hydrochloric acid $\to$ magnesium chloride + water
$Mg\left(OH{)}_2\right(s)+2HCl(aq)\to MgC{l}_2(aq)+2H_{2}O(l)$