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KVPY2019Chemistryp Block Elements (Group 13 & 14)

PbO 2 is obtained from

Options

  1. Athe reaction of PbO with HCl
  2. Bthermal decomposition of Pb NO 3 2 at 200 ° C
  3. Cthe reaction of Pb 3 O 4 with HNO 3
  4. Dthe reaction of Pb with air at room temperature

Correct answer

C. the reaction of Pb 3 O 4 with HNO 3

Step-by-step solution

(a) PbO + HCl ⟶ PbCl 2 + H 2 O (not correct option) (b) 2   Pb NO 3 2 ⟶ 2 PbO + 4 NO 2 + O 2 (not correct option) (c) Pb 3 O 4 + 4 HNO 3 ⟶ 2   Pb NO 3 2 + PbO 2 + 2 H 2 O (correct option) (d) Pb + air (contains O 2 , H 2 O and CO 2 ) room temperature Protective layer of varying cornposition, mainly PbCO 3 is formed only on the surface. (not correct option)

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