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Chemical Bonding

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Iodine heptafluoride has a structure of ___________.

  1. square pyramid

  2. trigonal bipyramid

  3. octahedral

  4. pentagonal bipyramid

  5. none of these


Correct Option: D
Explanation:

Here sp3d3 hybridisation will occur forming pentagonal bipyramid structure by 7 orbitals. 

Minimum ionic character is shown by ___________.

  1. FeCl2

  2. SnCl2

  3. AlCl3

  4. MgCl2

  5. None of these


Correct Option: C
Explanation:

It is correct. It has the maximum charge, smaller size of cation, larger size of anion. So, least ionic character.

Which of the following options represents isoelectronic species?

  1. C22-, O2-, CO, NO

  2. NO+, C22-, CN-, N2

  3. CN-, N2 , O22-, CO22-

  4. N2, O2-, NO+, CO

  5. None of these


Correct Option: B
Explanation:

All have 14 electrons. So, they are isoelectronics. 

Diamagnetism is shown by _________.

  1. O22-

  2. O2+

  3. O2

  4. NO

  5. None of these


Correct Option: A
Explanation:

Correct option. This species has 18 electrons, which are filled in such a way that all molecular orbitals are fully filled, so diamagnetic.

CaC2 is associated with which types of bonds?

  1. One sigma and two pi

  2. One sigma and one pi

  3. Two sigma and one pi

  4. Two sigma and two pi

  5. None of these


Correct Option: A
Explanation:

Carbide ion is C22- and is structured with two carbons with triple bond, i.e. one sigma, two pi. 

Xeon has maximum number of lone pairs in ___________.

  1. XeO3

  2. XeF4

  3. XeF6

  4. XeF2

  5. Both 2 and 4


Correct Option: D
Explanation:

XeF2 has 3 lone pairs- maximum.

In which of the following is the strongest hydrogen bond present?

  1. O-H....N

  2. F-H....F

  3. O-H....O

  4. O-H....F

  5. None of these


Correct Option: B
Explanation:

Fluorine has the highest electronegativity and thus, has the strongest bond. 

P4O10 has ______ number of P-O bonds.

  1. 17

  2. 16

  3. 15

  4. 6

  5. None of these


Correct Option: B
Explanation:

Number of P-O bonds in is P4O10 16. 

Bond angle of one hundred nine degree and twenty eight minutes is found in _________.

  1. NH3

  2. H2O

  3. C+H5

  4. N+H4

  5. None of these


Correct Option: D
Explanation:

It has an bond angle of 109o 28'. tetrahedral structure, sp3 hybridised.

Number of lone pairs in Xenon difluoride, Xenon tetrafluoride and Xenon hexafluoride are _________.

  1. 3, 2, 1

  2. 2, 4, 6

  3. 1, 2, 3

  4. 6, 4, 2

  5. None of these


Correct Option: A
Explanation:

XeF2 in first exited form is 5s2 5p5 5d1, i.e. 3 lone pairs. Similarly XeF4 has 2 lone pairs and XeF6 has 1 lone pair.

In which of the following compounds is bond angle found to be the smallest?

  1. SO2

  2. OH2

  3. SH2

  4. NH3

  5. None of these


Correct Option: C
Explanation:

Bond angle of SH2 is 90owhich is the smallest among the following.

Which of the following has the shortest bond length?

  1. O22+

  2. O2+

  3. O2-

  4. O22-

  5. O2


Correct Option: A
Explanation:

High bond order => Short bond length Bond order = 3  

Which of the following have the same bond length?

  1. CN- and NO+

  2. CN- and CN+

  3. O2- and CN-

  4. NO+ and CN+

  5. None of these


Correct Option: A
Explanation:

Same bond length means same bond order. Both CN- and NO+ have bond order of 3. 

Which of the following compounds is present in the tetrahedral structure?

  1. XeF4

  2. SF4

  3. BF4-

  4. [Ni(CN)4]2-

  5. None of these


Correct Option: C
Explanation:

BF4- has a regular tetrahedral structure. 

Energy of lattice of compounds having charge on them (i.e. ions) depends on __________.

  1. packing of ions only

  2. size of ion only

  3. charge and size of ion

  4. charge on the ion only

  5. none of these


Correct Option: C
Explanation:

Greater the charge and smaller the radius, greater the polarising power and thus, greater the covalent nature. This leads to increase in lattice energy. 

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