In the laboratory, hydrogen is prepared by the action of
AConcentrated hydrochloric acid on gold
BDilute nitric acid on copper turnings
CDilute sulphuric acid on granulated zinc
DConcentrated sulphuric acid on glass
Answer & Solution
Correct answer: C. Dilute sulphuric acid on granulated zinc
1. The chapter section on laboratory preparation names the standard route.
2. Granulated zinc reacts with dilute H2SO4.
3. The products are zinc sulphate and hydrogen gas.
4. So option A is correct.
_Source: Selina Concise Chemistry Class 8, Ch on Hydrogen (Mistral OCR'd PDF), section on laboratory preparation_
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