Q27 / 160 · AP EAMCET 2018 (23 Apr Shift 2) · Chemistry

Identify the statements which are not correct? (i) $\mathrm{ZnO}, \mathrm{PbO}, \mathrm{Sb}_2 \mathrm{O}_3$ are neutral oxides. (ii) $\mathrm{CO}$ and $\mathrm{NO}$ are amphoteric oxides. (iii) $\mathrm{CrO}_3, \mathrm{Mn}_2 \mathrm{O}_7, \mathrm{~V}_2 \mathrm{O}_5$ are basic oxides.

  • A
    i, ii
  • B
    i, iii
  • C
    ii, iii
  • Correct answer
    D
    i, ii,iii

Solution

(i) $\mathrm{ZnO}, \mathrm{PbO}, \mathrm{Sb}_2 \mathrm{O}_3$ are amphoteric oxides that have the properties of both acids and bases. They have acidic properties against bases and basic properties against acids. (ii) $\mathrm{CO}$ and $\mathrm{NO}$ are neutral oxides since they are oxygen poor compounds of non-metals. (iii) $\mathrm{CrO}_3, \mathrm{Mn}_2 \mathrm{O}_7, \mathrm{~V}_2 \mathrm{O}_5$ are acidic in nature.

Hence, the correct answer is option: 'D'.

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