a white crystalline substance taken in a test tube when heated with dilute hydrogen chloric acid gives of a colorless gas this gas turns limewater milky and extinguishes burning metal stick (a) name the substance and the gas envolved (b) white the chemical equation of the reation between substance and hydrochloric
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Answer:
The salt is sulphite. When the salt reacts with sulphuric acid, sulphur dioxide gas is liberated.
SO
3
2−
+2H
+
→SO
2
↓+H
2
O
This gas when reacts with lime water, turns milky.
SO
2
+Ca(OH)
2
→CaSO
3
↓(white)+H
2
O
And, when it reacts with an acidified orange colored potassium dichromate, solution turns green due to the formation of chromium ions.
Cr
2
O
7
2−
+2H
+
+3SO
2
→Cr
3+
+3SO
4
2−
+H
2
O
Answered by master expert IRON MAN
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