91Ó°ÊÓ

From the following information \(X+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow Y\) (a colourless and irritating gas) \(Y+\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow\) green coloured solution Identify the pair \(X\) and \(Y\). (a) \(\mathrm{Cl}^{-}, \mathrm{HCl}\) (b) \(\mathrm{SO}_{3}^{2-}, \mathrm{SO}_{2}\) (c) \(\mathrm{S}^{2-}, \mathrm{H}_{2} \mathrm{~S}\) (d) \(\mathrm{CO}_{3}^{2}, \mathrm{CO}_{2}\)

The catalyst used in the manufacture of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) by contact process is: (a) platinised asbestos (b) Ni (c) Fe (d) NO

Oleum is: (a) a mixture of conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) and oil (b) sulphuric acid saturated with \(\mathrm{SO}_{3}\) (c) a mixture of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) and \(\mathrm{HNO}_{3}\) (d) a mixture of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) and \(\mathrm{HCl}\)

Which is the most basic of the following oxides? (a) \(\mathrm{Na}_{2} \mathrm{O}\) (b) \(\mathrm{B}_{2} \mathrm{O}_{3}\) (c) \(\mathrm{ZnO}\) (d) \(\mathrm{P}_{2} \mathrm{O}_{3}\)

Which of the following is the most acidic? (a) \(\mathrm{Al}_{2} \mathrm{O}_{3}\) (b) \(\mathrm{Na}_{2} \mathrm{O}\) (c) \(\mathrm{MgO}\) (d) \(\mathrm{CaO}\)

Which is not the characteristic of conc. \(\mathrm{H}_{2} \mathrm{SO}_{4} ?\) (a) Oxidising agent (b) Efflorescent (c) Hygroscopic (d) Sulphonating agent

\(\mathrm{H}_{2} \mathrm{~S}\) is passed through potassium permanganate solution, we get: (a) potassium sulphide (b) sulphur (c) potassium sulphite (d) manganese sulphide

Which statement about \(\mathrm{H}_{2} \mathrm{~S}\) is false. ? (a) It is a covalent compound (b) It is a gas with bad smell (c) It is a weak base in water (d) It is a stronger reducing agent

Sulphur does not exist as \(\mathrm{S}_{2}\) molecule because : (a) It is less electronegative (b) It has ability to exhibit catenation (c) It is not able to constitute \(p \pi-p \pi\) bond (d) It has the tendency to show variable oxidation states

Ordinary oxygen contains: (a) a mixture of \(\mathrm{O}^{16}, \mathrm{O}^{17}\) and \(\mathrm{O}^{18}\) (b) a mixture of \(\mathrm{O}^{16}\) and \(\mathrm{O}^{17}\) (c) only \(\mathrm{O}^{16}\) (d) only \(\mathrm{O}^{18}\)