First slide
Sulphuric acid
Question

2NaZ+H2SO4(conc.) Na2SO4+2HZ. Z cannot be

Moderate
Solution

2NaI+H2SO4(conc.) 2HI+Na2SO4

2HI+H2SO4(conc.) I2+2H2O+SO2

Conc.H2SO4   oxidizes  HI  to  I2

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