1.

Write a balanced chemical equation for each of the following : (i) Action of concentrated sulphuric acid on carbon. (ii) Reaction of sodium hydroxide solution with iron (III) chloride solution.(iii) Action of heat on aluminium hydroxide. (iv) Reaction of zinc with potassium hydroxide solution. (v) Action of dilute hydrochloric acid on magnesium sulphite.

Answer»

(i) C + 2H2SO4 (Conc.) ---> CO2 + 2SO2 + 2H2

(ii) FeCl3 + 3NaOH ---> Fe(OH)3 + 3NaCl 

(iii) Aluminium hydroxide on heating decomposes into aluminium oxide along with water.

AI(OH)3 ---> Al2O3 +3H2

(iv) Elemental zinc reacts with strong bases to give zinc hydroxide, which on availability of extra OH- ions get dissolved in solution due to formation of zincate : 

Zn(s) + 2OH-(aq) --> Zn(OH)2(s) 

Zn(OH)2(s) + OH- ---> [Zn(OH)4]2-(aq) 

(v) Magnesium sulphite reacts with dilute hydrochloric acid to give magnesium chloride : 

MgSO3 + 2HCl ---> MgCl2 + H2O + SO2



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