Question

1. Identify the substances oxidised and the substance reduced in

the following reactions . Also identify oxidising and reducing

agents .

i. CuO + H2 Cu + H2O

ii. 4Na + O2 2Na2O

iii. MnO2 + 4HCl MnCl2 + Cl2 + 2H2O

iv. Fe2O3 + 2Al Al2O3 + 2Fe

v. ZnO + C Zn + CO

2. 2KClO3 Heat 2KCl + 3O2

Which of the following statements is correct about the reaction ?

a) It is Decomposition and Endothermic reaction

b) It is Combination reaction

c) It is Photochemical Decomposition reaction

d) None of these

3. Which of the following is getting reduced and acting as

oxidising agent In the reaction ?

Fe2O3 + 3CO 2Fe + 3CO 2

a) CO b) Fe c) CO2 d) Fe2O3
4. Which of the statements about the reaction below is / are

incorrect ?

2 PbO + C 2 Pb + CO2

a) Pb is getting reduced

b) CO2 is getting oxidised

c) Carbon is getting oxidised

d) PbO is getting reduced

5. What is a redox reaction ?

6. Differentiate between exothermic and endothermic reactions

with one example each .​

Answer 1

Answer:

1.i)oxidised substance-H2

Reduced substance-Cuo

Oxidizing agent-Cuo

Reducing agent-H2

ii)Oxidised substance-Na

Reduced substance-O2

Oxidizing agent-O2

Reducing agent-Na

iii)oxidised substance-Cl2

Reduced substance-Mno2

Oxidizing agent-Mno2

Reducing agent-Cl2

iv)Oxidised substance-Al

Reduced substance-Fe2O3

Oxidizing agent-Fe2O3

Reducing agent-Al

v)oxidised substance-C

Reduced substance-Zno

Oxidizing agent-Zno

Reducing agent-C

2.Option A it is a decomposition and endothermic reaction.

3.Fe2Co3

4.Co2 is getting oxidised

5.Redox is a type of chemical reaction in which the oxidation states of atoms are changed.

6.Endothermic Reaction

i) A reaction that the system absorbs energy from its surrounding in the form of heat.

ii)The energy is absorbed from the surrounding into the reaction.

2AgBr + sunlight →2Ag + Br2

Exothermic Reaction

i)A reaction that releases energy from the system in the form of heat.

ii)The energy is released from the system to its environment.

CaO + H2O → Ca(OH)2 + heat.

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