Question

Correction?

Which of the following combinations of reactants will result in a synthesis reaction? (My answer: C)

Cl2 + HBr

Ca + H2O

MgO + H2O

C2H2 + O2

Answer 1

Your answer is correct.

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

:-) ;-)

Answer 2

Answer: The correct answer is
`MgO+H_2O`

Step-by-step 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`