Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

Which of the following element has lowest melting point?

  • Cr

  • Fe

  • Ni

  • Cu


D.

Cu

Cu has lowest melting point because it has lowest enthalpy of atomisation (i.e., heat required to break the metal lattice to get free atoms) among the elements.


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2.

Maximum number of unpaired electrons are present in

  • Gd3+

  • Yb2+

  • Tb2+

  • Pm3+


3.

Total number of antibonding electrons present in O2 will be

  • 6

  • 8

  • 4

  • 2


4.

In BF3, the B - F bond length is 1.30Å, when BF3 is allowed to be treated with Me3N, it forms an adduct, Me3N BF3, the bond length of B - F in the adduct is

  • greater than 1.30 Å

  • smaller than 1.30 Å

  • equal to 1.30 Å

  • none of these


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5.

Which of the following is most basic?

  • Al(OH)3

  • Cr(OH)3

  • La(OH)3

  • Fe(OH)3


6.

K2Cr2O7 in acidic medium converts into

  • Cr2+

  • Cr3+

  • Cr4+

  • Cr5+


7.

A particle is moving 3 times faster than the speed of electron. If the ratio of wavelength of particle and electron is 1.8 x 10-4 then particle is

  • neutron

  • α- particle

  • deuteron

  • tritium


8.

What will be the solubility product of AX3?

  • 27S4

  • 4S3

  • 36S4

  • 9S3


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9.

Which thermodynamic parameter is not a state function?

  • q at constant pressure

  • q at constant volume

  • W at adiabatic

  • W at isothermal


10.

Assertion : Bond dissociation energy is F2 > Cl2.

Reason : Cl2 has more electronic repulsion than F2.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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