H2S gas when passed through a solution of cations containing HCl

Subject

Chemistry

Class

NEET Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

11.

Which of the following would have a permanent dipole moment?

  • BF3

  • SiF3

  • SF4

  • XeF4


Advertisement

12.

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


A.

presence of HCl decreases the sulphide ion concentration

H2S gas is passed in presence of HCl, in qualitative analysis of cation of second group, therefore, due to common ion effect, lower concentration of sulphide ions is obtained which is sufficient for the precipitation of second group cations in form of their sulphides due to lower value of their solubility product (Ksp). Here, fourth group cations are not precipitated because they require for exceeding their ionic product to their solubility products and higher sulphide ions concentration due to their higher Ksp which is not obtained here due to common ion effect.


Advertisement
13.

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

  • CO2

  • SO2

  • ClO2

  • SiO2


14.

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


Advertisement
15.

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


16.

Which among the following is the most stable carbocation?

  • C+H3

  • CH3C+H2


17.

Products of the following reaction

CH3C.CH2CH3 (2) Hydrolysis(1)O3.... are

  • CH3CHO + CH3CH2CHO

  • CH3COOH + CH3COCH3

  • CH3COOH + HOOC.CH2CH3

  • CH3COOH + CO2


18.

Which one of the following compounds is most acidic?

  • Cl - CH2 - CH2 - OH


Advertisement
19.

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

(R = Alkyl substituent)


20.

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]


Advertisement