How can you prove that hydrochloric acid contains
(i) hydrogen,
(ii) chlorine?

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Solution

(i) When hydrochloric acid reacts with metals, it forms the respective chlorides, liberating hydrogen gas in the process.
Metal + Hydrochloric acid → Metal chloride + Hydrogen

For example, hydrochloric acid reacts with magnesium to form magnesium chloride and hydrogen gas.

Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)
Magnesium Magnesium chloride Hydrogen

(ii) When hydrochloric acid reacts with strong oxidising agents, chlorine gas is liberated.
Oxidising agent + Conc. hydrochloric acid → Salt + Water + Chlorine

For example, concentrated hydrochloric acid reacts with manganese dioxide to form manganese chloride and chlorine gas.

MnO₂(s) + 4HCl(aq) → MnCl₂(aq) + 2H₂O(l) + Cl₂(g)
Manganese Manganese chloride Chlorine
dioxide
(black)

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Similar questions

How will you prove that Hydrochloric acid contains (i) hydrogen (ii) chlorine? Write equations for the reactions.

Q. State how and under what conditions you would obtain (a) hydrogen and (b) chlorine from hydrochloric acid without using electrolysis. [4 MARKS]

(a) Name two gases which combine chemically to form a solid.
(b) Name a chloride which is soluble in excess of ammonium hydroxide.
(c) How will you show that hydrochloric acid contains both hydrogen and chlorine (other than by electrolysis)?
(d) Complete and balance the following equations:
KMnO₄ + HCl $\overset{}{\to}$ _______ + _______ + ________ + 8H ₂O

Q. Hydrogen + Chlorine

\to

Hydrochloric acid

This is a:

Q. How many grams of hydrochloric acid are formed when

2

grams of hydrogen combine with the excess of chlorine?

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How can you prove that hydrochloric acid contains (i) hydrogen, (ii) chlorine?

How can you prove that hydrochloric acid contains
(i) hydrogen,
(ii) chlorine?