Important Questions of Chemical Bonding and Molecular Structure Chemistry | Zigya

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541.

CaO and NaCl have the same crystal structure and approximately the same ionic radii. If U is the lattice energy ofNaCI, the approximate lattice energy of CaO is

  • U/2

  • U

  • 2U

  • 4U


542.

During the formation of a chemical bond :

  • electron-electron repulsion becomes more than the nucleus-electron attraction

  • energy of the system does not change

  • energy increases

  • energy decreases


543.

The number of σ- and π-bonds present in pent-4-ene-1-yne is

  • 10, 3

  • 4, 9

  • 3, 10

  • 9, 4


544.

Assertion : H2S is less acidic than H2Te.

Reason : Te has larger, radius than S.

  • 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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545.

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.


546.

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

  • SiO2 , tetrahedral

  • SiO44- , square planar

  • SiO2 , square planar

  • SiO44- , tetrahedral


547.

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.


548.

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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549.

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

  • SeF4, XeO2F2

  • SF4, XeF2

  • XeOF4, TeF4

  • SeCl4, XeF4


550.

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


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