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Standard X

Chemistry

Chemical Reaction

Z is a compou...

Question

Z is a compound. With dilute HCl it gives a gas turning dichromatic solution green. Z gives lilac flame. Name Z.

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Solution

'Z' is potassium sulphite (K₂SO₃). It burns with a lilac or pink flame. When potassium sulphite is warmed with dilute HCl, it reacts and releases sulphur dioxide gas, which turns dichromate solution (orange colour) green. The equation for the reaction between potassium sulphite and dilute HCl is given below:

$K_{2} {SO}_{3} (aq) + 2 HCl (aq) \to 2 KCl (aq) + H_{2} O (l) + {SO}_{2} (g) Potassium Potassium Sulphur dioxide sulphite chloride 3 {SO}_{2} (g) + K_{2} {Cr}_{2} O_{7} (aq) + H_{2} {SO}_{4} (aq) \to K_{2} {SO}_{4} (aq) + {Cr}_{2} {({SO}_{4})}_{3} (aq) + H_{2} O (l) Sulphur Acidified Potassium Potassium Chromium dioxide dichromate sulphate sulphate$

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Which of the following anion is present in compound A when warmed with dilute sulphuric acid gives a colourless gas which turns acidified potassium dichromate solution green.

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