Important Questions of Chemical Bonding and Molecular Structure Chemistry | Zigya

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811.

Assertion : R3P=O exists but R3N=O does not exist.

Reason : P is more electronegative than N.

  • 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.


812.

The basic structural. unit and its geometry in silicates is :

  • SiO2 , tetrahedral

  • SiO44- , square planar

  • SiO2 , square planar

  • SiO44- , tetrahedral


813.

Assertion : Bond energy and bond dissociation energy have identical value for diatomic molecules.

Reason : Greater the bond dissociation energy, less reactive is the bond.

  • 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.


814.

KF combines with HF to form KHF2. This compound contains the species

  • K+, F- and H+

  • K+, F- and HF

  • K+ and [HF2]-

  • [KHF]+ and F2


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815.

The molecules having the same hybridization, shape and number of lone pairs of electrons are

  • SeF4, XeO2F2

  • SF4, XeF2

  • XeOF4, TeF4

  • SeCl4, XeF4


816.

The M - O- M bond angles in MO (where M is halogen) is in the order

  • Br2O > Cl2O > F2O

  • F2O > Br2O > Cl2O

  • F2O > Cl2O > Br2O

  • Cl2O > F2O > Br2O


817.

The geometry of methane molecule is :

  • tetrahedral

  • pyramidal

  • octahedral

  • square planar


818.

Heisenberg's uncertainty principle can be explained as :

  •  p × h4π

  • x x  h4π

  • x x  hπ

  •  πhx


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819.

The bond energy is the energy required to :

  • dissociate one mole of the substance

  • dissociate bond in 1 kg of the substance

  • break one mole of similar bonds

  • break bonds in one mole of the substance


820.

What is binding energy in B511 nucleus , if mass is 0.08181 amu ?

  • 1.2 x 10-4 erg/nucleus

  • 8.2 x 10-4 erg/nucleus

  • 10.2 x 10-4 erg/nucleus

  • 1.9 x 10-4 erg/nucleus


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