Question

When electricity is passed through an aqueous solution of sodium chloride( called brine), it decomposes to form chemical ‘X’ . the solution of ‘X’ on heating with few pieces of granulated zinc metal gives chemical ‘Y’ and ‘Z’ gas is evolved. i. Identify the chemicals X, Y and Z ii. Also write both the equation involved in this entire process.

Answer 1

Answer:

X is Sodium hydroxide.  

Y is Chlorine  gas.

Z is Hydrogen gas.

2NaCl(aq) + 2H2O(l)--->2NaOH(aq) + Cl2(g) + H2(g)

Explanation:

Answer 2

Concept introduction:

When a concentrated sodium chloride solution is exposed to an electric current, hydrogen gas is produced at the negative electrode, chlorine gas is produced at the positive electrode, and sodium hydroxide solution is also produced.

Explanation:

Given that, electricity is passed through an aqueous solution of sodium chloride( called brine), it decomposes to form chemical ‘X’ . the solution of ‘X’ on heating with few pieces of granulated zinc metal gives chemical ‘Y’ and ‘Z’ gas is evolved.

We have to find, the chemicals X, Y and Z.

According to the question,

On passing electricity through NaCl we will get Na and NaOH Hence X is NaOH.

And gas to be evolved is Cl$2$. Hence Y is Cl$2$.

And another gas is H$2$. Therefore Z is H$2$.

And the chemical equation is:

$2NaCl(aq) + 2H2O(l)--- > 2NaOH(aq) + Cl2(g) + H2(g)$

Final Answer:

The chemical equation is:

$2NaCl(aq) + 2H2O(l)--- > 2NaOH(aq) + Cl2(g) + H2(g)$.

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