1. State true or false: Corrosin is an oxidation reaction. (i) TRUE (ii) FALSE

Question

You must have observed that iron articles are shiny when new, but get coated with a reddish brown powder when left for some time. This process is commonly known as rusting of iron or corrosion. Some other metals also get tarnished in this manner.

1. State true or false: Corrosin is an oxidation reaction.

(i) TRUE

(ii) FALSE

2. Which of the following metal(s) get tarnished when they come in contact with oxygen and water?

(i) Iron

(ii) Silver

(iii) Copper

(iv) All of the above

3. Which of the following statements are correct about the reaction

3Fe + 4H₂O → FeO₄(s) + 4H₂(g) ?

(i) Iron metal is gettting oxidised

(ii) Water is getting reduced

(iii) Water is acting as an oxidising agent

(iv) All of the above

4. Which of the following statements is not true?

(i) Corrosion is a chemical change

(ii) Corrosion of iron is called rusting

(iii) Corrosion of iron is called rusting

(iv) Corrosion can take place in vaccum

5. Which of the following is(are) example(s) of corrosion?

(i) Black coating on silver

(ii) Green coating on copper

(iii) Rust on iron articles

(iv) All of the above

Answer 1

1. (i) TRUE

2. (iv) All of the above

3. (iv) All of the above

4. (iv) Corrosion can take place in vaccum

5. (iv) All of the above