Question

classify the following reactions into different types
AgNO3+NaCl= AgCl+NaNO3
CaO+H2O=Ca(OH)2
2KCl O3=2KCl+3O2
Zn+CuSO4=ZnSO4+Cu

Answer 1

Answer:

• $\mathrm{AgNO}_{3}+\mathrm{NaCl} \rightarrow \mathrm{AgCl}+\mathrm{NaNO}_{3}$ : This is a double displacement reaction where the two reactants react and exchange their ions to form new compounds. A solid precipitate of silver chloride along with aqueous sodium nitrate, both of which together gives a milky white suspension. The general format is: AB + CD ⇢AD + CB. Since a precipitate is formed, it is also called a precipitation reaction.

• $\mathrm{CaO}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Ca}(\mathrm{OH})$: This is an “exothermic combination reaction” where calcium oxide reacts with “water to form calcium hydroxide” or slaked lime. When calcium hydroxide is formed a ‘hissing sound’ is produced because of the heat released and hence is exothermic.

• $2 \mathrm{KCl}+\mathrm{O}_{3} \rightarrow 2 \mathrm{KCl}+3 \mathrm{O}_{2}$: This is a decomposition reaction where potassium chlorate upon heating undergoes “thermal decomposition reaction” to form the potassium chloride with the ‘release of oxygen’.

• $\mathrm{Zn}+\mathrm{CuSO}_{4} \cdots \mathrm{ZnSO}_{4}+\mathrm{Cu}$: This is a displacement and a redox reaction where zinc displaces the copper in copper sulphate to form zinc sulphate and copper. Since copper gets reduced and zinc gets oxidized, it is also a redox reaction.

Answer 2

Explanation:

AgNO3+NaCl→AgCl+NaNO3 : This is a double displacement reaction where the two reactants react and exchange their ions to form new compounds. A solid precipitate of silver chloride along with aqueous sodium nitrate, both of which together gives a milky white suspension. The general format is: AB + CD ⇢AD + CB. Since a precipitate is formed, it is also called a precipitation reaction.

\mathrm{CaO}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Ca}(\mathrm{OH})CaO+H2O→Ca(OH) : This is an “exothermic combination reaction” where calcium oxide reacts with “water to form calcium hydroxide” or slaked lime. When calcium hydroxide is formed a ‘hissing sound’ is produced because of the heat released and hence is exothermic.

2 \mathrm{KCl}+\mathrm{O}_{3} \rightarrow 2 \mathrm{KCl}+3 \mathrm{O}_{2}2KCl+O3→2KCl+3O2 : This is a decomposition reaction where potassium chlorate upon heating undergoes “thermal decomposition reaction” to form the potassium chloride with the ‘release of oxygen’.

\mathrm{Zn}+\mathrm{CuSO}_{4} \cdots \mathrm{ZnSO}_{4}+\mathrm{Cu}Zn+CuSO4⋯ZnSO4+Cu : This is a displacement and a redox reaction where zinc displaces the copper in copper sulphate to form zinc sulphate and copper. Since copper gets reduced and zinc gets oxidized, it is also a redox reaction.