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ICSE Class 10 Chemistry 2015 Paper

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The following questions are pertaining to the laboratory preparation of hydrogen chloride gas :
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Question : 77 of 85
Marks: +1, -0
Write the equation for its preparation mentioning the condition required.
Solution:  
NaCl+H2SO4(Conc.)→<200∘CNaHSO4\mathrm{NaCl} + \mathrm{H_2SO_4}_{\text{(Conc.)}} \xrightarrow{< 200^{\circ}\mathrm{C}} \mathrm{NaHSO_4} +HCl+ \mathrm{HCl}
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