Question

Question no. 18 all parts

Answer 1

Heya friend,

Here is it : -

1 ) Hydrogen gas is usually liberated when a reactive metal reacts with water.

for eg - Na +  H₂O = NaOH + H₂

2) We can extinguish fire involving electrical equipment by using fire extinguishers which can extinguish the oxygen which cause the fire by release of carbon dioxide gas.

3) Sodium is kept in kerosene oil because it is a highly reactive and flammable metal and react with the atmospheric moisture to cause accidental fire. So, to prevent it from accidental fires, it is kept immersed in kerosene oil.

4) Metals which are below hydrogen in the reactivity series or are less reactive than hydrogen can not displace it from water and hence cannot react with it.

Some of these metals are - Gold (Au) and Silver (Ag)

5) We can prevent iron from rusting through many techniques like -

(a) Oiling

(b) Greasing

(c) Galvanization

Thanks,

Manav

Answer 2

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hope the above answer helps u xD