91Ó°ÊÓ

Which one of the following pairs is obtained on heating ammonium dichromate? \(\quad\) [J.E.E. (W.B.) 2008] (a) \(\mathrm{N}_{2}\) and \(\mathrm{H}_{2} \mathrm{O}\) \(\square\) (b) \(\mathrm{N}_{2} \mathrm{O}\) and \(\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{NO}_{2}\) and \(\mathrm{H}_{2} \mathrm{O}\) \(\square\) (d) \(\mathrm{NO}\) and \(\mathrm{NO}_{2}\)

The salt which on heating gives a mixture of two gases is: (a) \(\mathrm{NaNO}_{3}\) \(\square\) (b) \(\mathrm{KNO}_{3}\) . (c) \(\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}\) \(\square\) (d) \(\mathrm{NH}_{4} \mathrm{NO}_{3}\)

Atomicity of phosphorus is: (a) 1 (b) 2 (c) 3 (d) 4

Superphosphate of lime is: (a) \(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2} \cdot \mathrm{CaSO}_{4}\) (b) \(\mathrm{Ca}\left(\mathrm{H}_{2} \mathrm{PO}_{4}\right)_{2}\) (c) \(\mathrm{Ca}\left(\mathrm{H}_{2} \mathrm{PO}_{4}\right)_{2} \cdot \mathrm{CaSO}_{4}\) (d) \(\mathrm{Ca}\left(\mathrm{H}_{2} \mathrm{PO}_{4}\right)_{2} \cdot \mathrm{H}_{2} \mathrm{O} \cdot 2 \mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\)

Laughing gas is: (a) \(\mathrm{NO}\) \(\square\) (b) \(\mathrm{N}_{2} \mathrm{O}\) (c) \(\mathrm{N}_{2} \mathrm{O}_{3}\) \(\square\) (d) \(\mathrm{N}_{2} \mathrm{O}_{5}\)

Nitrous oxide is prepared in the laboratory by: (a) combination of nitrogen and oxygen (b) reduction of \(\mathrm{NO}\) (c) reduction of nitric acid (d) thermal decomposition of \(\mathrm{NH}_{4} \mathrm{NO}_{3}\)

Ammonia is not used: (a) an anaesthesia (b) in medicine (c) in cold storages (d) for preparation of artificial silk

Which one of the following is used for drying of ammonia? (a) conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) \(\square\) (b) \(\mathrm{CaO}\) (c) \(\mathrm{P}_{2} \mathrm{O}_{5}\) \(\square\) (d) anhydrous \(\mathrm{CaCl}_{2}\)

Phosphorus is kept in: (a) kerosene \(\square\) (b) alcohol (c) water \(\square\) (d) ammonia

Which one of the following is not used for the manufacture of ammonia? (a) Haber process (b) Cyanamide process [ (c) Ammonical mother liquor (d) Solvay ammonia process