Question

With the help of balanced chemical equation explain what happens when:(1)Zinc is put in dilute hydrochloric acid (2)Zinc is put in concentrated sodium hydroxide.(3)Hydrogen is passed over hot tungsten oxide.(40Hydrogen is reacted with carbon monoxide in presence of a catalyst.

Answer 1

1)
`Zn(s)+2HCl(aq)--->ZnCl_(2)+H_(2)(g)`

2)
`Zn+2H_(2)O+2NaO-->Na_(2)Zn(OH)_(4)+H_(2)(g)`

3)
`3H_(2)(g)+W_(2)O_(3)--->3H_(2)O+2W(s)`

4)
`CO(g)+2H_(2)(g)--->CH_(3)OH`

Step-by-step explanation:

The following happens:

(1)Zinc is put in dilute hydrochloric acid

There is an evolution of hydrogen gas as the Zinc undergoes oxidation by hydrogen and it reduces the hydrogen to hydrogen gas.

`Zn(s)+2HCl(aq)--->ZnCl_(2)+H_(2)(g)`

(2)Zinc is put in concentrated sodium hydroxide.

Again there is evolution of hydrogen gas and formation of zincate sodium. This happens when we heat the mixture.

`Zn+2H_(2)O+2NaO-->Na_(2)Zn(OH)_(4)+H_(2)(g)`

(3)Hydrogen is passed over hot tungsten oxide.

The hydrogen reduces the tungsten metal during the reaction and it gives solid tungsten metal.

`3H_(2)(g)+W_(2)O_(3)--->3H_(2)O+2W(s)`

(4) Hydrogen is reacted with carbon monoxide in presence of a catalyst.

This is producer gas reaction.

`CO(g)+2H_(2)(g)--->CH_(3)OH`