Answer: Option D
:
D
Potassium reacts with water to form potassium hydroxide along with hydrogen. The chemical equation for this reactionis given below:
$\text{K}\text{(s)}+{\text{H}}_2\text{O}\text{(l)}\to \text{KOH(aq)}+{\text{H}}_2\text{(g)}$
We can see that:
Reactant
Product
Elements Symbol
No. of atoms
Elements Symbol
No. of atoms
K
1
K
1
H
2
H
3
O
1
O
1
Now in order to balance the equation the number of atoms on both reactants and the products side should be equal. By applying hit and trialmethod the balanced equation of the given reaction is:
$\text{2K}\text{(s)}+{\text{2H}}_2\text{O}\text{(l)}\to \text{2KOH(aq)}+{\text{H}}_2\text{(g)}$