Question

Which of the following is released on heating \[Pb{\left( {N{O_3}} \right)_2}\] ?
A.$NO$
B.${N_2}O$
C. ${N_2}{O_3}$
D.$N{O_2}$

Answer 1

Hint: When lead nitrate is heated thermal decomposition reaction takes place and lead oxide is produced. Here energy is provided in the form of heat and the substance lead nitrate breaks into two or more components.

Complete step by step answer:
Lead nitrate is white crystalline solid. When lead nitrate\[Pb{\left( {N{O_3}} \right)_2}\]is heated it is decomposed into more than one product. Hence the reaction is called thermal decomposition reaction. In thermal decomposition reaction extra energy is provided for the reaction to proceed further in the form of heat energy. It produces toxic fumes of nitrogen oxide and lead oxide. The reaction is as follows:
$ \Rightarrow 2Pb{\left( {N{O_3}} \right)_2} \to 2PbO + 4N{O_2} + {O_2}$
A yellow colored lead monoxide is produced and nitrogen monoxide is liberated along with oxygen. Nitrogen monoxide is released as a reddish brown gas which undergoes dimerization on cooling and forms dinitrogen tetroxide $\left( {{N_2}{O_4}} \right)$.
$ \Rightarrow 4N{O_2}\xrightarrow{{{\text{on cooling}}}}2{N_2}{O_4}$

Hence, the correct answer is D.

Additional Information:
 Lead nitrate is a crystalline solid whose properties are as follows-
-It is soluble in water.
- It itself is noncombustible but it can accelerate the burning of combustible materials.
-It is only slightly soluble in alcohol.
-It reacts violently with combustible materials and reduces materials.
-It reacts violently with ammonium thio-cyanate and red-hot carbon.
-It is often used as a floatation agent in removal of titanium from clays.

Note:
Lead nitrate is used in-
-Manufacturing of special explosives.
-As mordant in dyeing and printing on textiles.
-Oxidizer in the dye industry.
-Sensitizer in photography.
-In manufacture of read lead manufacture and in pyrotechnics, in rayon delustering
-In the tanning industry and lithography.