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Which of the following salt gives nitrogen dioxide gas on heating? a.) Pb(NO3)2 b.) ZnSO4.7H2O c.) NaHSO4 d.) CuSO4.5H2O

Which of the following salt gives nitrogen dioxide gas on heating?
a.) Pb(NO3)2
b.) ZnSO4.7H2O
c.) NaHSO4
d.) CuSO4.5H2O

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 60787 Points
2 years ago
On heating a solution, if the gas evolved is brown in colour, then the gas evolved is of nitrogen component and it is nitrogen dioxide. It is an acidic gas and turns moist blue litmus paper red. The chemical formula of nitrogen dioxide is NO2. Complete step by step solution: Nitrogen dioxide is an acidic gas which produces an acidic solution in water. It is one of the strong acidic gases in chemistry. It reacts with water to give nitrous acid and nitric acid. The chemical formula of nitrogen dioxide is NO2. Let us now see the reaction involved when the compounds given are heated. Pb(NO3)2: When Pb(NO3)2 is heated it decomposes to liberate lead monoxide, nitrogen dioxide and oxygen gas. The gas evolved is reddish brown in color which shows the presence of nitrogen dioxide gas. 2Pb(NO3)2⟶2PbO+4NO2+O2 ZnSO4.7H2O: When ZnSO4.7H2O is heated, it emits toxic fumes of zinc oxide and sulphur oxides and no nitrogen dioxide gas is evolved. NaHSO4: When NaHSO4 is heated, it forms Na2SO4 along with H2O and O2 But no nitrogen dioxide gas is evolved. 2NaHSO4⟶Na2SO4+H2O+SO3 CuSO4.5H2O: When CuSO4.5H2O is heated, it decomposes into dehydrate form and given out water. CuSO4.5H2O⟶CuSO4+5H2O Thus, from the above reactions we can see that only Pb(NO3)2 gives out NO2 gas when it is heated. Hence, option (a) is the correct answer. Note: All the nitrate salts when heated form nitrogen dioxide gas along with oxygen. Only sodium nitrate and potassium nitrate decomposes to liberate only oxygen gas. Since, nitrogen dioxide is liberated when Pb(NO3)2 is heated, it is used in pyrotechnics such as fireworks.

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