Question

Q.7.FeS + H2SO4 ------> FeSO4 + 2H2S ↑ In the above equation ↑ indicates:

1 point

(a) gas evolved

(b) insoluble substance formed

(c) reactive element

(d) element is not useful in chemical equation​

Answer 1

The correct answer is (a) gas evolved - ↑ indicates the gas evolved in a chemical equation.

Explanation:

• When 1 molecule of ferrous sulfide$(FeS)$ reacts with 1 molecule of sulfuric acid$(H_{2}SO_{4})$, 1 molecule of ferrous sulfate$(FeSO_{4})$ is formed and one molecule of hydrogen sulfide$(H_{2}S)$ is evolved.

• The above equation could also be written as:

$FeS(s) + H_{2}SO_{4}(aq)\rightarrow FeSO_{4}(s) + H_{2}S(g)$

Here,

• (s) represents solid state,
• (aq) represents aqueous state, and
• (g) represents the gaseous state.

Answer 2

Answer:

Gas Evolved

Explanation:

Gas which evolved are shown like that

i remember it as gases go up (↑) and the direction is also upwards