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Answer 1

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8(a)

Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions. In double replacement reactions, the positive ions exchange negative ion partners. A double replacement reaction is represented by the general equation.

AB + CD → AD + CB

In a double displacement reaction, atoms from two different compounds switch places. The reactants are two compounds and the products are two different compounds. Double displacement reactions can also be called double replacement reactions.

Fe$_2_$O$_3_$ + 6HCl → 2FeCl$_3_$ + 3H$_2_$O

8(b)

Na$_2_$S + 2HCl  →  2NaCl + H$_2_$S (↑)

H$_2_$S is a gas having a rotten egg smell.

9(a)

A decomposition reaction can be defined as a type of chemical reaction in which under suitable conditions, one single compound splits into multiple simpler substances. General Equation

AB → A + B

9(b)

Thermal / Heat decomposition reaction

A thermal decomposition reaction can be defined as a decomposition reaction which is activated by Heat energy. The reaction is generally endothermic as energy is required to break chemical bond in order to separate the constituent elements.

CaCO$_3_$ → CaO + CO$_2_$

Electrolytic decomposition reaction

An electrolytic decomposition reaction is a type of decomposition reaction in which the activation energy for decomposition is Electricity (AC).

2H$_2_$O→ 2H$_2_$ + O$_2_$

Photo decomposition/ photolytic decomposition/ photochemical decomposition

A photo decomposition is the type of decomposition reaction in which the reactant is broken down to its constituents by photons.

O$_3_$ + hν → O$_2_$ + [O]         (Nascent Oxygen )(Highly Reactive)

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