Multiple Choice QuestionsSolubility product (Ksp) of saturated PbCl2 in water is 1.8 × 10-4 mol3 dm-9. What is the concentration of Pb2+ in the solution?
(0.45 × 10-4)1/3 mol dm-3
(1.8 × 10-4)1/3 mol dm-3
(0.9 × 10-4)1/3 mol dm-3
(2.0 × 10-4)1/3 mol dm-3
A.
(0.45 × 10-4)1/3 mol dm-3
For the reaction of the AB2, i.e. (PbCl2)-
Ksp = 4s3
or, S =
Given, Ksp = 1.8 × 10-4 mol3dm-9
Solubility of Pb+2 ions will be
S =
= [0.45 × 10-4]1/3 mol. dm-3
The freezing point of equimolal solution will be highest for
C6H5NH3Cl
D- fructose
AgNO3
Ca(NO3)2
Consider the equilibrium obtained by electrically connecting zinc-amalgam Zn(Hg) and HgO electrodes in mercury cell,
Au(Hg) + HgO (s) ZnO (s) + Hg (l)
Under this equilibrium, what is the relation between the potential of the Zn(Hg) and HgO electrodes measured against the standard hydrogen electrode?
Zn(Hg) electrode potential is equal to HgO electrode potential.
Zn(Hg) electrode potential is more than HgO electrode potential.
HgO electrode potential is more than Zn(Hg) electrode.
Cell voltage at above said equilibrium is 1.35 V
One mole of an unknown compound was treated with excess water and resulted in the evolution of two moles of a readily combustible gas. The resulting solution was treated with CO2 and resulted in the formation of white turbidity. The unknown compound is
Ca
CaH2
Ca(OH)2
Ca(NO3)2
Purification of aluminium by electrolytic refining is called
Hall's process
Froth flotation process
Bayer's process
Hoop's process
If the boiling point difference between that two liquids is not much, the ............ method is used to separate them
Simple distillation
Distillation under reduced pressure
Steam distillation
Differential extraction
The letter 'D' in D-carbohydrates represents
Dextrorotation
Direct synthesis
Configuration
Mutarotation
Phenol is a highly corrosive substance, but it 0.2 percent solution is used as
Antibiotic
Antiseptic
Disinfectant
Antihistamine
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