State the type of chemical reaction. 2 Pb ( NO 3 ) 2 → ∆ 2 PbO + 4 NO 2 + O 2

2 Pb ( NO 3 ) 2 → ∆ 2 PbO + 4 NO 2 + O 2 In the above reaction we see that lead nitrate is heated up and it breaks into lead oxide, nitrogen dioxide and oxygen. When any compound is decomposed by the action of heat then the reaction is known as thermal decomposition reaction.

State the type of chemical reaction. 2 Pb ( NO 3 ) 2 → ∆ 2 PbO + 4 NO 2 + O 2

2 Pb ( NO 3 ) 2 → ∆ 2 PbO + 4 NO 2 + O 2 In the above reaction we see that lead nitrate is heated up and it breaks into lead oxide, nitrogen dioxide and oxygen. When any compound is decomposed by the action of heat then the reaction is known as thermal decomposition reaction.

State the type of chemical reaction. 2 AgBr ( s ) → sunlight 2 Ag ( s ) + Br 2 ( l )

2 AgBr ( s ) → sunlight 2 Ag ( s ) + Br 2 ( l ) In the above reaction we see that silver bromide is broken into a silver and bromine by the action of sunlight. When any compound decomposes into two or more products by the action of sunlight then the reaction is known as photochemical decomposition reaction.

State the type of chemical reaction. C + O 2 → ∆ CO 2

C + O 2 → ∆ CO 2 In the above reaction we see that carbon reacts with oxygen and forms carbon dioxide. When two elements combine to form single product then the reaction is known as combination reaction.

A white salt on heating decomposes to give brown fumes and a residue is left behind. Name the salt. Write the equation for the decomposition reaction

1. The white salt is lead nitrate which on heating decomposes to give brown fumes of nitrate and residue left behind is lead oxide. 2. 2 Pb ( NO 3 ) 2 ( s ) → heat 2 PbO ( s ) + 4 NO 2 ( g ) + O 2 ( g ) The above reaction is known as thermal decomposition.