Column – I	Column - II
A) Chemical combination	1) $\text{C}{l}_2+2\text{NaOH}\to \text{NaC}l+\text{NaOC}l+{\text{H}}_{\text{2}}\text{O}$
B) Chemical decomposition	2) $\text{Zn + 2HC}l\to \text{ZnC}{l}_2+{\text{H}}_{\text{2(g)}}$
C) Chemical displacement	3) ${\text{H}}_2{\text{O}}_{\text{(g)}}\to {\text{H}}_{\text{2(g)}}+\frac{1}{2}{\text{O}}_{\text{2(g)}}$
D) Chemical disproportionation	4) $C_{\left(s\right)}+{O_2}_{\left(g\right)}\to C{O_2}_{\left(g\right)}$

A) In chemical combination two (or) more reactants combine with to form one product

and Energy.Carbon react with oxygen to form carbondioxide and heat

B) An opposing reaction of chemical combination is called decomposition reaction. water is

decompose into Hydrogen and Oxygen

C) In a reaction one reactant displace with other reactant to form new products. Hydrogen is

displaced by Zn.

D) The reaction in which same element undergo both oxidation and reduction simultaneously is

called disproportionation reaction in above reaction chlorine undergoes oxidation and reduction.