Question

science
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Q/ans​

Answer 1

Answer:

1. sodium catches fire by reacting with oxygen present in water therefore it is kept in kerosene.

3. curd is of acidic nature. when any acid kept in metals it reacts and form hygroden gas that is poisonus. other example is lemon juice.

5. because ferum (iron) reacts with oxygen and vapour (water) present in atmosphere and form ferrous oxide that is a type of brown layer on iron items.

so to prevent it iron gates are painted frequently this process is called galvanisation

Answer 2

Answer:

ans 1= when sodium is placed in water they react vigorously and produce a lot of heat

ans 2= bells of temple are made up of metal because metal is sonorous

ans3=

Explanation:

it is because the curd us acidic in nature it react with metal when stored in it

ans 4 potassium

and sodium are stored in kerosine oil

ans 5=iron is most reactive element with water we paint them to.protect from rust