Question

$2Pb{{(N{{O}_{3}})}_{2}}\to 2PbO+nA+{{O}_{2}}$
What is the nA in the given reaction?
A. 4NO
B. $4N{{O}_{2}}$
C. $2PbN{{O}_{2}}$
D. $N{{O}_{2}}$

Answer 1

Hint: $Pb{{(N{{O}_{3}})}_{2}}$ is an organic compound named as lead nitrate. It commonly occurs as a white powder and colorless crystal and it is soluble in water. Lead(II) nitrate is toxic and must be handled with care to prevent inhalation, ingestion and skin contact. Due to its hazardous nature the limited applications of lead(II) nitrate are under constant scrutiny.

Complete Step by step solution: Reaction given above is thermal decomposition reaction. Thermal decomposition also known as thermolysis which is a chemical decomposition caused by heat. The reaction is usually endothermic in nature as heat is required to break chemical bonds in the compound undergoing decomposition. When metals are near the bottom of the reactivity series their compounds generally decompose easily at high temperatures. This is because stronger bonds form between atoms towards the top of the reactivity series and strong bonds break less easily. The nA in the reaction is given as: $2Pb{{(N{{O}_{3}})}_{2}}\to 2PbO+4N{{O}_{2}}+{{O}_{2}}$
-Lead nitrate crystals decompose to lead(II)oxide, oxygen and nitrogen dioxide. Hence, we can say that option D is the correct answer. $N{{O}_{2}}$ is an intermediate in the industrial synthesis of nitric acid and can also be used in the production of fertilizers. At higher temperatures it is a reddish-brown gas. Nitrogen dioxide is a paramagnetic, bent molecule.

Note: Lead nitrate is sometimes used in pyrotechnics such as fireworks and also used as a heat stabiliser in nylon and polyesters another use of lead nitrate is used as a coating for photo thermographic paper. While lead is used in pencils.