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p-Block Elements (Group 15–18)

NEET 2018MCQMedium📈 Topic in 50% papers+4−1
Ques. 1NEET 2018

Which of the following statements is not true for halogens?

  1. All are oxidizing agents.
  2. All form monobasic oxyacids.
  3. All but fluorine show positive oxidation states.
  4. Chlorine has the highest electron-gain enthalpy.

Answer

(3) All but fluorine show positive oxidation states.

Solution

(1) All halogens readily accept an electron ⇒ all are oxidising agents (F2 the strongest). True.

(2) Oxoacids such as HOF, HOCl, HClO4, HIO4 contain one ionisable –OH ⇒ monobasic. True.

(4) As per NCERT, chlorine has the most negative electron gain enthalpy in the group (fluorine is less because of its small size). True.

(3) As per NCERT, all halogens show the −1 oxidation state; chlorine, bromine and iodine show −1 as well as +1, +3, +5 and +7. So halogens other than fluorine do not show only positive oxidation states — the statement is not true.

Answer: (3)

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

Ques. 2NEET 2017

Match the interhalogen compounds of column-I with the geometry in column-II and assign the correct code.

  1. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
  2. (a)-(v), (b)-(iv), (c)-(iii), (d)-(ii)
  3. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
  4. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
Ques. 3NEET 2017

In which pair of ions both the species contain S-S bond?

  1. S4O62-, S2O32-
  2. S2O72-, S2O82-
  3. S4O62-, S2O72-
  4. S2O72-, S2O32-
Ques. 4NEET 2017

Name the gas that can readily decolourise acidified KMnO4 solution.

  1. SO2
  2. NO2
  3. P2O5
  4. CO2
Ques. 5NEET 2017

HgCl2 and I2 both when dissolved in water containing I- ions, the pair of species formed is

  1. HgI2, I-
  2. HgI42-, I3-
  3. Hg2I2, I-
  4. HgI2, I3-
Ques. 6NEET 2016 (Phase 1)

Match the compounds given in column I with the hybridisation and shape given in column II and mark the correct option

  1. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
  2. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
  3. (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
  4. (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
Ques. 7NEET 2016 (Phase 1)

Which is the correct statement for the given acids?

  1. Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid.
  2. Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid.
  3. Both are diprotic acids.
  4. Both are triprotic acids.
Ques. 8NEET 2016 (Phase 1)

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

  1. Br2 > I2 > F2 > Cl2
  2. F2 > Cl2 > Br2 > I2
  3. I2 > Br2 > Cl2 > F2
  4. Cl2 > Br2 > F2 > I2
Ques. 9NEET 2016 (Phase 1)

When copper is heated with conc. HNO3 it produces

  1. Cu(NO3)2, NO and NO2
  2. Cu(NO3)2 and N2O
  3. Cu(NO3)2 and NO2
  4. Cu(NO3)2 and NO
Ques. 10NEET 2016 (Phase 1)

Among the following the correct order of acidity is

  1. HClO2 < HClO < HClO3 < HClO4
  2. HClO4 < HClO2 < HClO < HClO3
  3. HClO3 < HClO4 < HClO2 < HClO
  4. HClO < HClO2 < HClO3 < HClO4
Ques. 11NEET 2016 (Phase 2)

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour?

  1. Cu + 2H2SO4 CuSO4 + SO2 + 2H2O
  2. 3S + 2H2SO4 3SO2 + 2H2O
  3. C + 2H2SO4 CO2 + 2SO2 + 2H2O
  4. CaF2 + H2SO4 CaSO4 + 2HF

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