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2.Zinc will produce hydrogen gas on reaction with dilute sulphuric acid. Because zinc is more reactive than hydrogen so it displaces hydrogen from sulphuric acid. Whereas copper is less reactive than hydrogen in activity series it placed below hydrogen . hence copper can displace hydrogen from H2SO4.
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3.When potassium nitrate is heated. It decomposes into potassium nitrite and oxygen
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Zn is your answer
O2 is your answer
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