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p-Block Elements (Group 15–18) · Question 58

AIPMT 2003MCQMedium📈 Topic in 50% papers+4−1
1

Which one of the following statements is not true?

  1. Among halide ions, iodide is the most powerful reducing agent.
  2. Fluorine is the only halogen that does not show a variable oxidation state.
  3. HOCl is a stronger acid than HOBr.
  4. HF is a stronger acid than HCl.

Answer

(4) HF is a stronger acid than HCl.

Solution

(1) True: reducing power of halide ions I- > Br- > Cl- > F-, since I- is the largest and loses its electron most easily.

(2) True: fluorine, being the most electronegative element, shows only the −1 oxidation state.

(3) True: Cl is more electronegative than Br, so it pulls electron density from the O–H bond more strongly ⇒ HOCl is a stronger acid than HOBr.

(4) Not true: as per NCERT, acidic strength of halogen acids is HF < HCl < HBr < HI, because the H–X bond dissociation enthalpy decreases down the group (H–F bond is the strongest).

∴ The incorrect statement is (4).

Answer: (4)

AIPMT 2003

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

2

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
AIPMT 2002
3

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
4

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
5

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
6

Which compound has planar structure?

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

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