Give balanced equations for the following conversions.

(a) Sodium zincate from zinc

(b) Sodium plumbite from lead

(c) Sodium aluminate from aluminium.

In the laboratory preparation of hydrogen from zinc and dil. acid. Give reasons for the following :

(a) The complete apparatus is air-tight.

(b) Dilute nitric acid is not preferred as the reactant acid.

(c) The lower end of the thistle funnel should dip below the level of the acid in the flask.

(d) Hydrogen is not collected over air.

State the conditions and give balanced equations for the conversion of –

(a) coke to water gas,

(b) water gas to hydrogen

in the Bosch process.

How are the unreacted gases separated out in 'Bosch process' in the manufacture of hydrogen.