| Nidhi took two China dishes and marked them as I and II. |
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| In China dish I, she mixed iron filings and sulphur powder. In China dish II, she mixed iron filings and dilute hydrochloric acid. What were her observations in both the dishes? |
A) In China dish I, a mixture is formed, where iron filings and sulphur powder can be seen separately.
B) In China dish II, a new compound is formed, which is different from iron filings and dilute hydrochloric acid.
C) A colourless and odourless gas comes out from China dish II.
D) All the above observations are correct.
Correct Answer: D
Solution :
In China dish I, iron filings and sulphur powder are mixed without heating so, no new compound is formed and both these substances can be seen separately. In China dish II, iron filings react with dilute hydrochloric acid to form a new compound (ferrous chloride) and a colourless, odourless gas (hydrogen) is evolved. \[\underset{\text{Iron}}{\mathop{\text{Fe}}}\,\text{+}\underset{\begin{smallmatrix} \text{Hydrochloric} \\ \text{acid} \end{smallmatrix}}{\mathop{\text{2HCI}\left( \text{dil}\text{.} \right)}}\,\xrightarrow{{}}\underset{\begin{smallmatrix} \text{Ferrous} \\ \text{chloride}\,\,\text{gas} \end{smallmatrix}}{\mathop{\text{FeC}{{\text{l}}_{\text{2}}}}}\,\text{+}\underset{\text{Hydrogen}}{\mathop{{{\text{K}}_{\text{2}}}}}\,\]
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