Question

1. Rusting of an iron nail is a ..... reaction.

a. combination
b. displacement
c. decomposition
d. double displacement



2. The following change is
observed on dipping a litmus paper in aqueous solution of Mgo.

a. Red litmus turns blue, therefore MgO is alkaline.

b. Blue litmus turns red, therefore MgO is acidic.

c. No colour change in litmus paper, therefore MgO is neutral.
d. Litmus paper decolourised, therefore MgO acts sa bleaching agent.


3. What is the colour of a solution formed on dipping a piece of zinc in dilute sulphuric acid ?
a. colourless
b. colourless solution turns red c. black
d. red
​

Answer 1

Answer:

Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Iron and steel rust when they come into contact with water and oxygen – both are needed for rusting to occur.

Explanation:

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Answer 2

Answer:

1.combination

2.Red litmus turns blue, therefore MgO is alkaline.

3.colourless