Question

When a current is passed through a solution of salt water, sodium chloride decomposes according to the following reaction:

2NaCl + 2H2O → 2NaOH + Cl2 + H2

What is the chemical symbol for the starting substance?
A NaCl
B H2O
C Cl2
D NaOH

What is the chemical symbol for the ending substance?
A H2O
B NaOH
C Cl2
D NaCl

Answer 1

A, NaCl

B. NaOH

Step-by-step explanation:

As the current is passed through a solution of salt water it means the solution is formed by dissolving sodium chloride in water.

Thus the chemical symbol of starting material must be NaCl and H₂O.

Where

Na : Sodium

Cl : Chlorine

Now when this solution is electrolysed there is formation of sodium hydroxide , chlorine and hydrogen thus the chemical symbol of product will be:

NaOH : sodium hydroxide

Cl₂ : chlorine

H₂ : hydrogen

Answer 2

The chemical symbol for the starting substance is A. NaCl
and the end is
B. NaOH