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p-Block Elements (Group 15–18) · Question 56

AIPMT 2005MCQMedium📈 Topic in 38% papers+4−1
1

What is the correct relationship between the pH of isomolar solutions of sodium oxide, Na2O (pH1), sodium sulphide, Na2S (pH2), sodium selenide, Na2Se (pH3) and sodium telluride Na2Te (pH4)?

  1. pH1 > pH2 > pH3 > pH4
  2. pH1 > pH2 pH3 > pH4
  3. pH1 < pH2 < pH3 < pH4
  4. pH1 < pH2 < pH3 pH4

Answer

(1) pH1 > pH2 > pH3 > pH4

Solution

As per NCERT, the acidic character of the hydrides of group 16 increases from H2O to H2Te: H2O < H2S < H2Se < H2Te

The stronger the acid, the weaker its conjugate base: basic strength O2- > S2- > Se2- > Te2-

The anions hydrolyse to give OH- ions; the stronger base gives more OH- and a higher pH (Na2O reacts completely with water to give NaOH).

pH1 > pH2 > pH3 > pH4

Answer: (1)

AIPMT 2005

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

2

Which one of the following orders correctly represents the increasing acid strengths of the given acids?

  1. HOClO < HOCl < HOClO3 < HOClO2
  2. HOClO3 < HOClO2 < HOClO < HOCl
  3. HOClO2 < HOClO3 < HOClO < HOCl
  4. HOCl < HOClO < HOClO2 < HOClO3
AIPMT 2005
3

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.
AIPMT 2003
4

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
5

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
6

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
7

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
8

Which compound has planar structure?

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

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