Question

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(b) dry hydrogen gas was reacted with iron fillings using the set up below:-
(i) write occur in the combustion tube.
(ii) write an equation at the point of the flame.

Explanation:

Step1: Reaction in combustion tube

When dry hydrogen chloride gas reacts with iron fillings, iron (II) chloride is formed and hydrogen gas is released.
$$Fe + 2HCl \xrightarrow{\Delta} FeCl_{2}+H_{2}$$

Step2: Reaction at the flame

The hydrogen gas released burns in air (oxygen) to form water.
$$2H_{2}+O_{2}\xrightarrow{\text{Flame}}2H_{2}O$$

Answer:

(i) $$Fe + 2HCl \xrightarrow{\Delta} FeCl_{2}+H_{2}$$
(ii) $$2H_{2}+O_{2}\xrightarrow{\text{Flame}}2H_{2}O$$