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Chemical Bonding and Molecular Structure · Question 80

AIPMT 2009MCQEasy📈 Topic in 0% papers+4−1
1

In the case of alkali metals, the covalent character decreases in the order

  1. MF > MCl > MBr > MI
  2. MF > MCl > MI > MBr
  3. MI > MBr > MCl > MF
  4. MCl > MI > MBr > MF

Answer

(3) MI > MBr > MCl > MF

Solution

As per Fajans' rule, for the same cation the covalent character increases with the size (polarisability) of the anion.

Size of anions: I- > Br- > Cl- > F-

⇒ Polarisation of the anion and hence covalent character: MI > MBr > MCl > MF

Answer: (3)

Out of syllabusAIPMT 2009

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2

Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them

  1. NO < O2- < C22- < He2+
  2. O2- < NO < C22- < He2+
  3. C22- < He2+ < O2- < NO
  4. He2+ < O2- < NO < C22-
AIPMT 2008
3

The correct order of increasing bond angles in the following triatomic species is

  1. NO2+ < NO2 < NO2-
  2. NO2+ < NO2- < NO2
  3. NO2- < NO2+ < NO2
  4. NO2- < NO2 < NO2+
AIPMT 2008
4

The angular shape of ozone molecule (O3) consists of

  1. 1σ and 1π bond
  2. 2σ and 1π bond
  3. 1σ and 2π bonds
  4. 2σ and 2π bonds
AIPMT 2008
5

In which of the following pairs, the two species are isostructural?

  1. SO32- and NO3-
  2. BF3 and NF3
  3. BrO3- and XeO3
  4. SF4 and XeF4
AIPMT 2007
6

The correct order of C-O bond length among CO, CO32-, CO2 is

  1. CO < CO32- < CO2
  2. CO32- < CO2 < CO
  3. CO < CO2 < CO32-
  4. CO2 < CO32- < CO
AIPMT 2007
7

Which of the following is not a correct statement?

  1. Multiple bonds are always shorter than corresponding single bonds.
  2. The electron-deficient molecules can act as Lewis acids.
  3. The canonical structures have no real existence.
  4. Every AB5 molecule does in fact have square pyramid structure.
AIPMT 2006
8

Which of the following is not isostructural with SiCl4 ?

  1. NH4+
  2. SCl4
  3. SO42-
  4. PO43-
AIPMT 2006
9

Which of the following species has a linear shape?

  1. O3
  2. NO2-
  3. SO2
  4. NO2+
AIPMT 2006
10

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH3 (1.5 D) is larger than that of NF3 (0.2 D). This is because

  1. in NH3 the atomic dipole and bond dipole are in the opposite directions whereas in NF3 these are in the same direction
  2. in NH3 as well as in NF3 the atomic dipole and bond dipole are in the same direction
  3. in NH3 the atomic dipole and bond dipole are in the same direction whereas in NF3 these are in opposite directions
  4. in NH3 as well as in NF3 the atomic dipole and bond dipole are in opposite directions.
AIPMT 2006
11

In which of the following molecules are all the bonds not equal?

  1. NF3
  2. ClF3
  3. BF3
  4. AlF3
AIPMT 2006

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