Chemistry - Redox Reactions Question with Solution | TestHub

ChemistryRedox ReactionsDetermination of Oxidation StateMedium2 minQB

ChemistryMediumsingle choice

Passage / Comprehension

"M" is a silver-white metal. It dissolves slowly in dilute acid with the evolution of H₂ and produces an aqueous, colorless solution of metal ion (X).

$(X)$ produce ppt with excess NaOH but produce colourless solution with excess of $NH_{3}$ . Yellow ppt obtain by reaction of $(X)$ with $H_{2} S$ is not soluble in ammonium polysulphide.

What is oxidation number of sulphur in product when dil. $H_{2} SO_{4}$ react with metal ' M ' :-

Options:

Answer:

Solution:

Metal M is Zn (zinc), a silver-white metal that reacts with dilute acids producing H₂ gas.
When Zn reacts with dilute H₂SO₄, it forms ZnSO₄ + H₂.
In SO₄²⁻ (sulfate ion), oxygen is −2 each, so total is −8 and overall charge is −2.
Therefore, sulfur oxidation number is +6.
Hence, correct answer is (B) +6.

Stream:JEESubject:ChemistryTopic:Redox ReactionsSubtopic:Determination of Oxidation State

⏱ 2mℹ️ Source: QB

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