Q2 of 37 Page 7

What happens when hydrogen gas is added to copper oxide?

When Hydrogen gas is added to copper oxide reduction of copper oxide to metallic copper takes Place. Following is the Reaction:

CuO + H2 → Cu + H2O : Reduction of Copper oxide


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6

What do the symbols (aq) and (s) indicate in a balanced chemical equation?

 1

Identify the type of reaction:

(i) CH4(g) + 2O2(g) → CO2(g)+ 2H2O(g)


(ii) 2NaCI(l) 2Na(s) + Cl2(g)


(iii) MnO2 + 4HCI MnCl2 + 2H2O+ Cl2

 3

Name one reaction which is accompanied by the evolution of heat.

 4

Name the type of reaction for the following:

(i) Vegetable matter changing into compost.


(ii) Burning of natural gas.