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ICSE Class 10 Chemistry 2015 Solved Paper

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The following questions are pertaining to the laboratory preparation of hydrogen chloride gas :
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Question : 79
Total: 85
State a safety precaution you would take during the preparation of hydrochloric acid.
Solution:  
The temperature should be raised above 200∘C during the preparation of hydrochloric acid because above this temperature it forms sticky substance sodium sulphate that sticks to glass apparatus which becomes difficult to remove and also cause wastage of heat.
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