Question

Q.4. Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid whereas copper does not. Explain why.

Q. 5. Write the following in the form of balanced chemical equations:-

(a) Calcium carbonate decomposes on heating to form calcium oxide and carbon di- oxide.

(b) When ammonium hydroxide is added to a solvent of iron (ll) Sulphate, a green ppt of iron (ll) hydroxide and ammonium Sulphate are formed.

(c) When a nail of iron is added to a solution of copper Sulphate, iron (ll) Sulphate and copper metal are formed.

(d) Zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen gas is liberated.

Q6. A chemical reaction which is both combination as well as exothermic, is used by us for white washing purposes. Write the equation for the same.

Q.7. What is a decomposition reaction? Give 2 examples each of decomposition taking place due to heat, light and electricity.

Q.8. How does a displacement reaction differ from a double displacement reaction? Give examples to explain.


pls help


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Answer 1

Explanation:

u can compare those values in the text book fr question 4 th only lower SRP values can liberate the hydrogen gas

Answer 2

Answer:

copper does not liberate H2 because it is less reactive than zinc