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State one relevant observation for the f...

State one relevant observation for the following reaction :
Action of dilute Hydrochloric acid on iron (II) sulphide.

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Iron sulphide reacts with hydrochloric acid, releasing a highly toxic gas hydrogen sulphide having rotten egg smell and turns blue litmus paper red.
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ICSE-SAMPLE PAPER 2017-SECTION-II
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  11. Identify the salts Q from the observations given below: When dilute...

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  17. Select the ion in each case, that would get selectively discharged fro...

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