Problem 6
The chemical formula of zeolite is \(\ldots \ldots\) (a) \(\mathrm{Na}_{2} \mathrm{Al}_{2} \mathrm{Si}_{2} \mathrm{O}_{8} \cdot \mathrm{xH}_{2} \mathrm{O}\) (b) \(\mathrm{Na}_{2}\left(\mathrm{Na}_{4}\left(\mathrm{PO}_{3}\right)_{6}\right.\) (c) \(\mathrm{Ca}_{2} \mathrm{Al}_{2} \mathrm{Si}_{2} \mathrm{O}_{8}\) (d) \(\mathrm{K}_{2} \mathrm{Al}_{2} \mathrm{Si}_{2} \mathrm{O}_{8} \cdot \mathrm{xH}_{2} \mathrm{O}\)
Problem 6
Germanium is transparent in: (a) Visible light (b) Infra violet region (c) Infra-red region (d) Ultra violet region
Problem 7
Three centred bond is present in (a) \(\mathrm{NH}_{3}\) (b) \(\mathrm{AlCl}_{3}\) (c) \(\mathrm{B}_{2} \mathrm{H}_{6}\) (d) \(\mathrm{BCl}_{3}^{-}\)
Problem 7
When \(\mathrm{SiCl}_{4}\) is allowed to undergo hydrolysis to gives (a) \(\mathrm{Si}(\mathrm{OH})_{4}-\) Silicic acid (b) \(\mathrm{SiO}_{2}-\) Silicic acid (c) \(\mathrm{Si}(\mathrm{OH}) \mathrm{Cl}_{3}-\) Silicic acid (d) \(\mathrm{SiCl}_{4}\) do not undergo hydrolysis
Problem 8
Boron nitride on reacting with caustic alkali gives (a) \(\mathrm{NO}_{2}\) (b) \(\mathrm{N}_{2} \mathrm{O}\) (c) \(\mathrm{Na}_{2} \mathrm{BO}_{2}\) (d) \(\mathrm{NH}_{3}\)
Problem 8
Carbon is soluble in: (a) Concentrated \(\mathrm{HNO}_{3}\) (b) Diluted HCl (c) Concentrated \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (d) Concentrated \(\mathrm{HCl}\)
Problem 9
Which of the following does not give borax bead test? (a) \(\mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}\) (b) \(\left(\mathrm{CH}_{3} \mathrm{COO}\right)_{2} \mathrm{Co}\) (c) \(\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}\) (d) \(\mathrm{NiSO}_{4}\)
Problem 9
\(\mathrm{H}_{2} \mathrm{SO}_{4}\) is not used for the preparation of \(\mathrm{CO}_{2}\) from marble chips because: (a) Calcium sulphate is sparingly soluble and gets dposited on marble chips and stops the reaction (b) Diluted HCl (c) It does not react (d) Huge amount of heat is evolved
Problem 10
Aluminium vessels should not be washed with materials containing washing soda since (a) Washing soda is easily decomposed. (b) Washing soda reacts with aluminium to form insoluble aluminium oxide. (c) Washing soda is expensive. (d) Washing soda reacts with aluminium to form soluble aluminate.
Problem 10
Which of the following is a good conductor of electricity? (a) Coal (b) Diamondl (c) Graphite (d) None
