Problem 12
The correct sequence of decrease in the bond angle of following hydrides is (a) \(\mathrm{NH}_{3}>\mathrm{PH}_{3}>\mathrm{AsH}_{3}>\mathrm{SbH}_{3}\) (b) \(\mathrm{NH}_{3}>\mathrm{AsH}_{3}>\mathrm{PH}_{3}>\mathrm{SbH}_{3}\) (c) \(\mathrm{SbH}_{3}>\mathrm{AsH}_{3}>\mathrm{PH}_{3}>\mathrm{NH}_{3}\) (d) \(\mathrm{PH}_{3}>\mathrm{NH}_{3}>\mathrm{AsH}_{3}>\mathrm{SbH}_{3}\)
Problem 13
The crystals of ferrous sulphate on heating give (a) \(\mathrm{FeO}+\mathrm{SO}_{2}+\mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{FeO}+\mathrm{SO}_{3}+\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{SO}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}\)
Problem 14
Ammonia can be dried by (d) Anhydrous \(\mathrm{CaCl}_{2}\) (a) Conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (b) \(\mathrm{P}_{4} \mathrm{O}_{10}\) (c) \(\mathrm{CaO}\)
Problem 15
The element that has the least tendency to show the inert-pair effect is (a) Bi (b) \(\bar{P}\) (c) \(\mathrm{Sb}\) (d) \(\mathrm{N}\)
Problem 16
When potassium ferrocyanide crystals are heated with conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\), the gas evolved is (a) \(\mathrm{SO}_{2}\) (b) \(\mathrm{NH}_{3}\) (c) \(\mathrm{CO}_{2}\) (d) \(\mathrm{CO}\)
Problem 18
Which of the following does not have \(\mathrm{S}-\mathrm{S}\) linkage? (a) \(\mathrm{S}_{2} \mathrm{O}_{8}^{2-}\) (b) \(\mathrm{S}_{2} \mathrm{O}_{6}^{2-}\) (c) \(\mathrm{S}_{2} \mathrm{O}_{5}^{2-}\) (d) \(\mathrm{S}_{2} \mathrm{O}_{3}^{2-}\)
Problem 19
On passing \(\mathrm{H}_{2} \mathrm{~S}\) through acidified \(\mathrm{FeCl}_{3}\) solution, \(\mathrm{FeCl}_{3}\) is converted into (a) \(\mathrm{FeCl}_{2}\) (b) \(\mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3}\) (c) \(\mathrm{Fe} \mathrm{S}\) (d) \(\mathrm{FeSO}_{4}\)
Problem 20
Caro's acid is (d) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\) (a) \(\mathrm{H}_{2} \mathrm{SO}_{5}\) (b) \(\mathrm{H}_{2} \mathrm{SO}_{3}\) (c) \(\mathrm{H}_{3} \mathrm{~S}_{2} \mathrm{O}_{5}\)
Problem 21
The basic character of the hydrides of \(\mathrm{V}\) group elements decreases in the order (a) \(\mathrm{NH}_{3}>\mathrm{PH}_{3}>\mathrm{AsH}_{3}>\mathrm{SbH}_{3}\) (b) \(\mathrm{SbH}_{3}>\mathrm{AsH}_{3}>\mathrm{PH}_{3}>\mathrm{NH}_{3}\) (c) \(\mathrm{NH}_{3}>\mathrm{SbH}_{3}>\mathrm{PH}_{3}>\mathrm{AsH}_{3}\) (d) \(\mathrm{SbH}_{3}>\mathrm{PH}_{3}>\mathrm{AsH}_{3}>\mathrm{NH}_{3}\)
Problem 22
The number of \(\mathrm{P}-\mathrm{O}\) - \(\mathrm{P}\) bonds in cyclic metaphosphoric acid is (a) Zero (b) Two (c) Three (d) Four
