Which of the following would have a permanent dipole moment?

• BF₃

• SiF₃

• SF₄

• XeF₄

H₂S gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because: 

• presence of HCl decreases the sulphide ion concentration

• presence of HCl increases the sulphide ion concentration

• solubility product of group II sulphides is more than that of group IV sulphides

• sulphides of group IV cations are unstable in HCl

Which one of the following oxides is expected to exhibit paramagnetic behaviour?

• CO₂

• SO₂

• ClO₂

• SiO₂

A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at 20$°$C are 440 mm of Hg for pentane and 120 mm of Hg for hexane. The mole fraction of pentane in the vapour phase would be

• 0.549

• 0.200

• 0. 786

• 0.478

4.5 g of aluminium (Atomic mass 27 amu) is deposited at cathode from Al³⁺ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H⁺ ions in solution by the same quantity of electric charge will be

• 22.4 L

• 44.8 L

• 5.6 L

• 11.2 L

Which among the following is the most stable carbocation?

• 

• 

• $\stackrel{+}{\mathrm{C}}{\mathrm{H}}_3$

• CH₃$\stackrel{+}{\mathrm{C}}$H₂

17.

Products of the following reaction

CH₃C $\equiv$C.CH₂CH₃ $\underset{\left(2\right) \mathrm{Hydrolysis}}{\overset{\left(1\right)\hspace{0.17em}{\mathrm{O}}_3}{\to }}$.... are

• CH₃CHO + CH₃CH₂CHO

• CH₃COOH + CH₃COCH₃

• CH₃COOH + HOOC.CH₂CH₃

• CH₃COOH + CO₂

Which one of the following compounds is most acidic?

• Cl - CH₂ - CH₂ - OH

• 

• 

• 

Which one of the following alkenes will react faster with H₂ under catalytic hydrogenation conditions?

(R = Alkyl substituent)

Which one of the following is expected to exhibit optical isomerism? (en = ethylenediamine)

• cis-[Pt (NH₃)₂Cl₂]

• trans-[Co (en)₂ Cl₂]

• trans- [Pt (NH₃)₂Cl₂]

• cis-[Co(en)₂Cl₂]