91Ó°ÊÓ

The species that do not contain peroxide ions are: (a) \(\mathrm{PbO}_{2}\) (b) \(\mathrm{H}_{2} \mathrm{O}_{2}\) (c) \(\mathrm{SrO}_{2}\) (d) \(\mathrm{BaO}_{2}\)

When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water the sodium ions are exchanged with: (a) \(\mathrm{H}^{+}\) ions (b) \(\mathrm{Ca}^{++}\) ions (c) \(\mathrm{SO}_{4}^{-}\) ions (d) \(\mathrm{OH}^{-}\) ions

Which of the following statements is incorrect?[BHU 2008] (a) \(\mathrm{H}_{2} \mathrm{O}_{2}\) can act as an oxidising agent 1 (b) \(\mathrm{H}_{2} \mathrm{O}_{2}\) can act as a reducing agent (c) \(\mathrm{H}_{2} \mathrm{O}_{2}\) has acidic properties (d) \(\mathrm{H}_{2} \mathrm{O}_{2}\) has basic properties \(=\)

The hybrid state and oxidation state of two oxygen atoms in \(\mathrm{H}_{2} \mathrm{O}_{2}\) are respectively : (a) \(s p_{3}^{2},-1\) (b) \(s p_{i}^{2}+1\) (c) \(s p^{3},-1\) (d) \(s p^{3},+1\)

Given colourless liquid will be determined whether it is water or not? (a) By smelling (b) By tasting 1 (c) By phenolphthalein (d) By adding a pinch of anhydrous \(\mathrm{CuSO}_{4}\)

Heavy water is used in atomic reactor as: (a) coolant (b) moderator (c) both coolant and moderator (d) neither coolant nor moderator

Heavy water freezes at: (a) \(0^{\circ} \mathrm{C}\) (b) \(3.8^{\circ} \mathrm{C}\) (c) \(38^{\circ} \mathrm{C}\) (d) \(-3.8^{\circ} \mathrm{C}\)

Hydrogen does not combine with: (a) He (b) \(\mathrm{Na}\) (c) Sb (d) Bi

Hydrogen directly combines with: (a) \(\mathrm{Ca}\) (b) \(\mathrm{Mg}\) (c) Al (d) \(\mathrm{Cu}\)

The metal which displaces hydrogen from a boiling caustic soda solution is: (a) \(\mathrm{Ag}\) (b) \(\mathrm{Zn}\) (c) \(\mathrm{Mg}\) (d) Fe \(\square\)