Question

Correction?

Answer 1

Answer: The correct answer is $MgO+H_2O$

Explanation:

Synthesis reaction is defined as the reaction in which two smaller substances combine together to form a large single compound.

$A+B\rightarrow AB$

For the given options:

Option 1:  $Cl_2+HBr$

These two combination produces hydrochloric acid and bromine gas. The reaction is known as single displacement reaction.

$Cl_2+2HBr\rightarrow 2HCl+Br_2$

Option 2:  $Ca+H_2O$

These two combination produces calcium hydroxide and hydrogen gas. The reaction is known as single displacement reaction.

$Ca+2H_2O\rightarrow Ca(OH)_2+H_2$

Option 3:  $MgO+H_2O$

These two combination produces magnesium hydroxide only. The reaction is known as synthesis reaction.

$MgO+H_2O\rightarrow Mg(OH)2$

Option 4:  $C_2H_2+O_2$

These two combination produces carbon dioxide and water molecule. The reaction is known as combustion reaction.

$2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O$

From the above information, the correct answer is $MgO+H_2O$

Answer 2

Your answer is correct.

MgO(s) + H2O(l) ----> Mg(OH)2(aq)

:-) ;-)