Which one have the highest melting point ? from Chemistry Chemic

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 Multiple Choice QuestionsMultiple Choice Questions

771.

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


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772.

Which one have the highest melting point ?

  • CsCl

  • NH3

  • He

  • CHCl3


A.

CsCl

CsCl is an ionic compound. it has the highest melting point.


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773.

The compound with maximum covalent character is :

  • AlCl3

  • AlI3

  • AgI2

  • NaI


774.

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


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775.

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

  • 5σ , 5π

  • 8σ , 6π

  • 7σ , 3π

  • 6σ , 4π


776.

The geemetry of the compound of sp3d hybridisation is :

  • pyramidal

  • triangular

  • planar

  • trigonal bipyramidal


777.

Which is correct regarding size of atom?

  • N < O

  • B < Ne

  • V > Ti

  • Na > K


778.

Which of the following is not sp2 hybridised?

  • Graphite

  • Graphene

  • Fullerene

  • Dry ice


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779.

Choose the correctly paired gaseous cation and its magnetic (spin only) moment (in B.M.)

  • Ti2+,3.87 B.M.

  • Cr2+, 4.90 B.M.

  • Co3+,3.87 B.M.

  • Mn2+,4.90 B.M.


780.

In Omolecule, the formal charge on the central O-atom is

  • 0

  • -1

  • -2

  • +1


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