Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

For an electron , if the uncertainty in velocity isv ,the uncertainty in its position (x) is given by :

  • hm4πν

  • 4πhmν

  • h4πmv

  • 4πmhν


C.

h4πmv

For an electron , if the uncertainty in velocity isv ,the uncertainty in its position (x) is given by :


2.

Equation of Boyle's law is :

  • dPP = -dVV

  • dPP = +dVV

  • d2PP = -dVdT

  • d2PP = +d2VdT


A.

dPP = -dVV

Equation of Boyle's law is :


3.

Ionic compounds are formed most easily with :

  • low electron affinity , high ionisation energy

  • high electron affinity , low ionisation energy

  • low electron affinity , low ionisation energy

  • high electron affinity , high ionisation energy


B.

high electron affinity , low ionisation energy

Ionic compounds are formed most easily with :


4.

Orbital is :

  • circular path around the nucleus in which the electrons revolves

  • space around the nucleus where the probability of finding the electron is maximum

  • amplitude of electron wave

  • none of the above


B.

space around the nucleus where the probability of finding the electron is maximum

Orbital is :


5.

A metal surface is exposed to solar radiations :

  • the emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations

  • the emitted electrons have energy less than maximum value of energy depending upon intensity of incident radiations

  • the emitted electrons have zero energy

  • the emitted electrons have energy equal to energy of photons of incident light


A.

the emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations

A metal surface is exposed to solar radiations :


6.

Which of the following sequence is correct as perAufbau principle ?

  • 3s < 3d < 4s < 4p

  • ls < 2p < 4s < 3d

  • 2s < 5s < 4p < 5d

  • 2s < 5s < 4p < 5f


B.

ls < 2p < 4s < 3d

Which of the following sequence is correct as perAufbau principle ?


7.

Which of the following transitions haveminimum wavelengths ?

  • n4  n1

  • n2  n1

  • n4  n2

  • n3  n1


A.

n4  n1

Which of the following transitions haveminimum wavelengths ?


8.

The Ksp of Mg(OH)2 is 1 x 10-12 , 0.01 M Mg(OH)2will precipitate at the limited pH :

  • 3

  • 9

  • 5

  • 8


B.

9

The Ksp of Mg(OH)2 is 1 x 10-12 , 0.01 M Mg(OH)2will precipitate at the limited pH :


9.

The enthalpy change (H) for the neutralisationof M HCl by caustic potash in dilute solution at298 K is :

  • 68 kJ

  • 65 kJ

  • 57.3 kJ

  • 50 kJ


C.

57.3 kJ

The enthalpy change (H) for the neutralisationof M HCl by caustic potash in dilute solution at298 K is :


10.

A radioactive sample is emitting 64 timesradiations than non-hazardous limit .If itshalf-life is 2 hours , after what time it becomesnon- hazardous ?

  • 16 h

  • 10 h

  • 12 h

  • 8 h


C.

12 h

A radioactive sample is emitting 64 timesradiations than non-hazardous limit .If itshalf-life is 2 hours , after what time it becomesnon- hazardous ?