NF3 and BF3 both are covalent , but BF3 is non-polar, while

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 Multiple Choice QuestionsMultiple Choice Questions

501.

N2O is isoelectronic to CO2 and N3-. Which of the following is the structure of N2O ?

  • N-O-N

  • N-N-O


502.

Number of lone pair in XeOF4 is :

  • zero

  • one

  • two

  • three


503.

Assertion : C- O.... - H bond angle is less than the normal tetrahedral bond angle.

Reason : Lone pair-lone pair repulsion decreases bond angle.

  • 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.


504.

The geometry of ammonia is :

  • tetrahedral

  • pyramidal

  • triangular

  • trigonal bipyrarnidal


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505.

Assertion : Diamagnetic substances are not attracted by magnetic field.

Reason : Diamagnetic substances have no unpaired electrons.

  • 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


506.

Which one have the highest melting point ?

  • CsCl

  • NH3

  • He

  • CHCl3


507.

The compound with maximum covalent character is :

  • AlCl3

  • AlI3

  • AgI2

  • NaI


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508.

NF3 and BF3 both are covalent , but BF3 is non-polar, while NF3 is polar because :

  • boron is non-metal in free state , while N2 is gas

  • there is no dipole moment in B-F  bond while N-F bond have some dipole moment

  • BFis planar while NF, is pyramidal

  • boron atom is smaller than nitrogen atom


B.

there is no dipole moment in B-F  bond while N-F bond have some dipole moment

NFand BF3 both are covalent but BF3 is non polar , while NF3 is polar because there is no dipole moment in BF bond while NF bond have some dipole moment.


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509.

The number of σ (sigma) and π (pi) bonds in 1-buene-3-yne is :

  • 5σ , 5π

  • 8σ , 6π

  • 7σ , 3π

  • 6σ , 4π


510.

The geemetry of the compound of sp3d hybridisation is :

  • pyramidal

  • triangular

  • planar

  • trigonal bipyramidal


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