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Question

Analyse the data given below and choose the option correctly depicting A, X, Y, and Z.​
KNO3 + H2SO4 Chemical A (g)

Reactant Product Product
Metal X + A​ Metallic salt​ Gas Y
Nitrate salt of metal X + A Metallic oxide Gas Z + Gas Y

A
A: HNO3; X: Zn; Y: NO3; Z: O2
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B
A: HNO3; X: Zn; Y: NO2; Z: O2
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C
A: HCl; X: Zn; Y: NO3; Z: O2
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D
A: HNO3; X:Na; Y: NO2; Z:O2
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Solution

The correct option is B A: HNO3; X: Zn; Y: NO2; Z: O2
  • KNO3 (aq) + Conc. H2SO4 (g) heat HNO3 (g) + KHSO4 (aq)
  • Chemical A is HNO3
  • Metal can’t be Na as its nitrate salt on decomposition will not yield metal oxide.​
  • The reaction of Zn with HNO3is : Zn (s) + 4HNO3 (aq) Zn(NO3)2 (aq) + 2H2O (l) + 2NO2 (g)
  • The decomposition reaction of zinc nitrate is: 2Zn(NO3)2 (s) heat2ZnO (s) + 4NO2 (g) + O2 (g)
  • So A isHNO3; X isZn; Y isNO2; Z isO2
  • Correct option is B

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