Corrosion, Class 12 Chemistry NCERT Solutions

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. Painting of the Iron surface is a type of:

Barrier protection

Sacrificial protection

Electrical protection

None of these

Your comments:

Question 1 of 10

2. Zinc is used to protect iron from rusting because reduction potential of zinc is:

more positive than that of iron

less than that of iron

equal to that of Iron

more than that of iron

Your comments:

Question 2 of 10

3. Which method is used to prevent rusting of automobile parts (Car radiators)?

Oiling and greasing

Use of anti rust solution

Painting

Galvanization

Your comments:

Question 3 of 10

4. Lead loses its lustre due to:

Corrosion

Reaction with some other metal

Due to some change in physical conditions

None of the above

Your comments:

Question 4 of 10

5. In electrochemical theory of rusting 'Fe' undergoes:

Oxidation

Reduction

Salt formation

None of the above

Your comments:

Question 5 of 10

6. Chemically anti rust solutions are :-

alkaline phosphate and alkaline sulphate solution

alkaline carbonate and alkaline borate solution

alkaline borate and alkaline chromate solution

alkaline phosphate and alkaline chromate solution

Your comments:

Question 6 of 10

7. What would happen if the protective tin coating over an iron bucket is broken from some places?

The Iron exposed in the broken parts will not be affected

The portion of Iron exposed will undergo corrosion

The part that is broken will absorb moisture

The broken part gets changed into green colour

Your comments:

Question 7 of 10

8. During electrical protection, the active metal used will be present in which of the following form:

Anode

Cathode

A salt of active metal as electrolyte

None of the above

Your comments:

Question 8 of 10

9. Four Iron sheets are coated with 4 different metals (A, B,C,D) whose standard potentials are -0.46V, -0.56V, -0.66V and -0.20 V respectively. Given that the standard reduction potential for Iron is -0.44V. In which case the rusting of Iron will be faster when the coating is damaged.

A

C

B

D

Your comments:

Question 9 of 10

10. Rust is chemically:

a hydrated oxide

a pure compound

a hydroxide

a hydrated salt

Your comments:

Question 10 of 10

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