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p-Block Elements (Group 15–18) · Question 59

AIPMT 2002MCQMedium📈 Topic in 50% papers+4−1
1

Which of the following statement is true?

  1. Silicon exhibits 4 coordination number in its compounds
  2. Bond energy of F2 is less than Cl2
  3. Mn(III) oxidation state is more stable than Mn(II) in aqueous state
  4. Elements of 15th group show only +3 and +5 oxidation states

Answer

(2) Bond energy of F2 is less than Cl2

Solution

(1) Silicon also shows coordination number 6, e.g. [SiF6]2- (vacant d orbitals) ⇒ not true.

(2) As per NCERT, the bond dissociation enthalpy of F2 is smaller than that of Cl2 because of large lone pair–lone pair repulsion in the small F2 molecule ⇒ true.

(3) Mn2+ (3d5, half-filled) is more stable; Mn3+ disproportionates in water ⇒ not true.

(4) Group 15 elements show -3, +3 and +5 (nitrogen shows -3 to +5) ⇒ not true.

Answer: (2)

AIPMT 2002

Keep practising — p-Block Elements (Group 15–18)

2

Zn gives H2 gas with H2SO4 and HCl but not with HNO3 because

  1. Zn acts as oxidising agent when it reacts with HNO3
  2. HNO3 is weaker acid than H2SO4 and HCl
  3. In electrochemical series Zn is above hydrogen
  4. NO3- is reduced in preference to hydronium ion.
AIPMT 2002
3

Nitrogen forms N2, but phosphorus does not form P2, however, it exists as P4, reason is

  1. triple bond present between phosphorus atoms
  2. p - p bonding is weak
  3. p - p bonding is strong
  4. multiple bonds form easily.
AIPMT 2001
4

Which statement is wrong ?

  1. Bond energy of F2 > Cl2
  2. Electronegativity of F > Cl
  3. F is more oxidising than Cl
  4. Electron affinity of Cl > F
AIPMT 2000
5

Which compound has planar structure?

  1. XeF4
  2. XeOF2
  3. XeO2F2
  4. XeO4
AIPMT 2000

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