Question

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Answer 1

Answer:

1. reaction in which heat is released along with the formation of product all exothermic reaction
2. in this reaction of company splits into two or more substances called is decomposition reaction
3. when decomposition is carried out by passing electricity than it is said to be electric decomposition reaction

Answer 2

Exothermic Reaction-

A chemical change which proceeds with the evolution of heat energy is called an exothermic reaction.

Examples-

i) N2(g) + 3H2(g) ⇔ 2NH3(g).+ HEAT

ii) 2H2(g)+O2(g)→2H2O(l) + HEAT

Double decomposition Reaction-

A chemical reaction in which both reactants are decomposed to give two new compounds by exchanging their radicals is called double decomposition reaction.

Examples-

i) Na2CO3 + CaCl2 → 2 NaCl + CaCO3

ii)HCl+NaOH→H2O+NaCl

Electrochemical Reaction-

A chemical reaction which proceeds with the absorption of electric energy is called an electrochemical reaction.

Examples-

i)2H2O (acidified) ->(electric current) 2H2+ O2.

ii)NaCl(fused) ->(elecric current) Na+Cl.

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