A metal surface is exposed to solar radiations : from Chemistry

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

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

  • hm4πν

  • 4πhmν

  • h4πmv

  • 4πmhν


2.

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

  • 3

  • 9

  • 5

  • 8


3.

Equation of Boyle's law is :

  • dPP = -dVV

  • dPP = +dVV

  • d2PP = -dVdT

  • d2PP = +d2VdT


4.

A radioactive sample is emitting 64 times radiations than non-hazardous limit .If its half-life is 2 hours , after what time it becomes non- hazardous ?

  • 16 h

  • 10 h

  • 12 h

  • 8 h


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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 ,the emitted electrons have energy less than maximum value of energy depending upon freauency of incident radiations .


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6.

Which of the following transitions have minimum wavelengths ?

  • n4  n1

  • n2  n1

  • n4  n2

  • n3  n1


7.

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


8.

Which of the following sequence is correct as per Aufbau principle ?

  • 3s < 3d < 4s < 4p

  • ls < 2p < 4s < 3d

  • 2s < 5s < 4p < 5d

  • 2s < 5s < 4p < 5f


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9.

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


10.

The enthalpy change (H) for the neutralisation of M HCl by caustic potash in dilute solution at 298 K is :

  • 68 kJ

  • 65 kJ

  • 57.3 kJ

  • 50 kJ


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