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ICSE Class 10 Chemistry 2013 Solved Paper

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Give a chemical test to distinguish between the following pairs of compounds :
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Question : 20
Total: 84
Hydrogen chloride gas and hydrogen sulphide gas.
Solution:  
When a rod dipped in NH3 is brought to the mouth of test tube. In case of HCl gas dense white fumes observed. Whereas no such fumes observed in case of H2S gas.
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