Explanation
Correct Answer: Option B
Explanation:
Among the hydrogen halides, $$HI$$ is ionic while $$HCl$$, $$HBr$$ and $$HF$$ are covalent.
The boiling points of ionic compounds are higher than that of covalent compounds.
The boiling point of covalent compounds is proportional to their molecular mass.
But in $$HF$$, there is intermolecular hydrogen bonding. So $$HF$$ has a higher boiling point than $$HCl$$.
Hence, the boiling point of $$HCl$$ is the lowest.
Water and coal are made to react by passing steam over red hot coke at very high temperature, producing a mixture of carbon monoxide and hydrogen which is called water gas.
Carbon monoxide is converted into carbon dioxide by passing the water gas and excess steam over the catalyst iron (III) oxide and chromium (III) oxide at very high temperature.
Carbon monoxide is separated from hydrogen gas by passing it through water at a pressure of 30 atmospheres due to which carbon monoxide is absorbed in water unlike hydrogen gas.
When water is boiled to 100$$^{\circ}$$ C, it converts into steam which on condensation gives back water. Here, the heat given out is called latent heat of condensation which is equal to the latent heat of vapourisation.
The reaction between anhydrous copper sulfate and water is reversible:
Anhydrous copper sulfate (white) $$+$$ water $$=$$ Hydrated copper sulfate (blue)
$$CuSO4 + 5H_2O \rightarrow CuSO_4.5H_2O$$.
White anhydrous amorphous copper sulfate combines with $$5$$ molecules of water to form hydrous blue copper sulfate (blue vitriol).
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