Chemistry MCQs

Page No. 12

Magnetic quantum number specifies___________?


aShape of orbitals


bSize of orbitals


cOrientation of orbitals


dAll of the above



If R is the Rydberg constant for hydrogen, then wave-number of the second line in the Lyman series is _________?


a2R


bR/2


c3R/4


dR/4


View Answer 3R/4

Generally the limit of visible spectrum is__________?


a1000 to 3000 A°


b3800 to 7600 A°


c8000 to 10000 A°


d12000 to 15000 A°


View Answer 3800 to 7600 A°

Which one of the following is the correct sequence according to atomic weights?


aFe>Co> Ni


bCo > Ni > Fe


cNi> Co> Fe


dCo > Fe > Ni


View Answer Co > Ni > Fe

Alpha particles can be detected by using___________?


aGold foils


bBarium sulphate


cZinc sulphide screen


dThin Aluminium sheet


View Answer Zinc sulphide screen

When 0.01 moles of NaOH are added to a buffer solution, its PH changes from 4.745 to 4.832. What is its?


a0.115


b0.900


c0.015


d0.215


View Answer 0.115

The PH of pure water at 25°C, kw=1×10-4____________?


a0


b7


c14


dNone of the above


View Answer 7

The PH of Tears is __________?


a7.0


b7.4


c7.8


d8.2


View Answer 7.4

The PH of the 1.3 × 10-4 NH4Cl is__________?


a1.3


b4.0


c2.886


d3.886


View Answer 3.886

The PH of the 0.0032 M H2SO4 is__________?


a3.2


b4.0


c2.198


d1.0


View Answer 3.2

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