Question

Check Point 02
on
Se
I
1 Identify the type of reaction:
(1) CH4(g) + 20, (g) → CO2 (g) + 2H20 (g)
(ii) 2NaCl(1) Electric current 2Na (s) + Cl, (g)
(iii) MnO2 + 4HCI → MnCl2 + 2H2O + Cl2
2 What happens when hydrogen gas is added to copper
oxide?
3 Name one reaction which is accompanied by the evolution
of heat.
4 Name the type of reaction for the following:
(1) Vegetable matter changing into compost.
(ii) Burning of natural gas.
5 Write the four factors responsible for the corrosion of iron.
6 Name one element in which corrosion is not proved to be
wasteful.​

Answer 1

Answer:

Ans1 exothermic reaction

electrolysis decomposition reaction

redox reaction

Ans.2. reduction reaction take place

CuO+H2 - Cu + H2O

ans3. burning of magnesium ribbon

2Mg+O2 - 2MgO + heat

Ans4. exothermic reaction

endothermic reaction

Ans5. reaction with oxygen

due to moisture

poor maintenance

reaction with chemicals present in the atmosphere

Ans6. Aluminium