Question

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Answer 1

Answer:

Synthesis :SO3 + H2O —> H2SO4

Single displacement : Pb(NO3)2 + 2NaI —> PbI2 + 2NaNO3

Decomposition : CaCO3 —> CaO + CO2

Combustion : 2ZnS + O2 —> 2ZnO + 2S

Explanation:

Answer 2

Answer :

(a) $SO_3+H_2O\rightarrow H_2SO_4$

This reaction is a synthesis reaction.

(b) $Pb(NO_3)_2+2NaI\rightarrow PbI_2+2NaNO_3$

This reaction is a double-displacement reaction.

(c) $CaCO_3\rightarrow CaO+CO_2$

This reaction is a decomposition reaction.

(d) $2ZnS+O_2\rightarrow 2ZnO+2S$

This reaction is a single displacement reaction.

Explanation :

Synthesis reaction : A chemical reaction where multiple substances or reactants combine to form a single product.

It is represented as,

$X+Y\rightarrow XY$

Combustion reaction : A chemical reaction in which a hydrocarbon reaction with the oxygen to give product as carbon dioxide and water.

It is represented as,

$CH_4+2O_2\rightarrow CO_2+2H_2O$

Single replacement reaction : A chemical reaction in which the more reactive element replace the less reactive element.

It is represented as,

$A+BC\rightarrow AC+B$

In this reaction, A is more reactive element and B is less reactive element.

Double replacement reaction : It is a type of chemical reaction where a positive cation and a negative anion of two reactants exchange places to form two new products.

It is represented as,

$XY+AB\rightarrow XB+AY$

(X and A are the cations, Y and B are the anions)

Decomposition reaction : A chemical reaction where single larger substance or reactant decompose to give two or more products.

It is represented as,

$XY\rightarrow X+Y$

(a) $SO_3+H_2O\rightarrow H_2SO_4$

This reaction is a synthesis reaction.

(b) $Pb(NO_3)_2+2NaI\rightarrow PbI_2+2NaNO_3$

This reaction is a double-displacement reaction.

(c) $CaCO_3\rightarrow CaO+CO_2$

This reaction is a decomposition reaction.

(d) $2ZnS+O_2\rightarrow 2ZnO+2S$

This reaction is a single displacement reaction.