Chemistry MCQs

Page No. 94

Pressure in gas discharge tube was kept________________?


a10 torr


b1 torr


c0.1 torr


d0.01 torr


View Answer 0.01 torr

Which one of the following explain the shape of orbitals _________________?


aPrincipal of quantum number


bAzimuthal quantum number


cMagnetic quantum number


dSpin quantum number



Splitting of spectral lines when atom is subjected to magnetic field is called _______________?


aZeemans effect


bStarks effect


cPhoto electric effect


dCompton effect


View Answer Zeemans effect

Rutherfords planet like structure was defective and unsatisfactory because_________________?


aMoving e- accelerate towards the nucleus


bContinuous spectrum


cbehavior of electron remain unexplained


dall


View Answer all

Which one is not true about cathode rays ?


a9.11×10-31 Kg


bCast shadow


cHeat up the platinum foil


dCannot ionize


View Answer Cannot ionize

When an atom absorbs energy the lines in the spectrum will appear which are_________________?


aBrighter


bDarker


cColourless


dHard to locate


View Answer Darker

The maximum number of electron in a sub shell with ? = 3fs______________?


a6


b10


c14


d18


View Answer 14

The magnetic quantum number (QN) has its values determined directly by the value of_______________?


aPrincipal (QN)


bAzimuthal (QN)


cSpin (QN)


dBoth A and B


View Answer Azimuthal (QN)

All of the following were theorized by Bohr in his description of the atom except__________________?


aAngular momentum of electrons in multiples of h/2?


bElectrons revolve in discrete circular orbits


cEnergy of each electron is directly proportional to n2


dElectrons radiate energy continuously in a given orbit.



The amount of heat absorbed when one mole of a liquid is changed into gas at its boiling point is_____________________?


aMolar heat of sublimation


bMolar heat of fusion


cMolar heat of vapourization


dLatent heat of that liquid



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