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p-Block Elements (Group 15–18)

NEET (UG) 2021MCQMedium📈 Topic in 38% papers+4−1
Ques. 1NEET (UG) 2021

In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?

  1. CO2 < SiO2 < SnO2 < PbO2 : Increasing oxidizing order
  2. HF < HCl < HBr < HI : Increasing acidic strength
  3. H2O < H2S < H2Se < H2Te : Increasing pKa values
  4. NH3 < PH3 < AsH3 < SbH3 : Increasing acidic character

Answer

(3) H2O < H2S < H2Se < H2Te : Increasing pKa values

Solution

(1) Down group 14 the +2 state becomes more stable (inert pair effect), so PbO2 is the strongest oxidising agent ⇒ order correct.

(2) Down group 17 the H–X bond enthalpy decreases ⇒ acidic strength HF < HCl < HBr < HI ⇒ correct.

(3) As per NCERT, the acidic character of hydrides of group 16 increases from H2O to H2Te (H–E bond enthalpy decreases). Stronger acid ⇒ larger Ka ⇒ smaller pKa.

∴ pKa decreases: H2O > H2S > H2Se > H2Te ⇒ the given sequence is wrong.

(4) Down group 15 the E–H bond becomes weaker ⇒ acidic character increases NH3 < PH3 < AsH3 < SbH3 ⇒ correct.

Answer: (3)

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

Ques. 2NEET (UG) 2020

Urea reacts with water to form A which will decompose to form B. B when passed through Cu2+(aq), deep blue colour solution C is formed. What is the formula of C from the following?

  1. [Cu(NH3)4]2+
  2. Cu(OH)2
  3. CuCO3 Cu(OH)2
  4. CuSO4
Ques. 3NEET (UG) 2020

Which of the following oxoacid of sulphur has -O-O- linkage?

  1. H2SO4, sulphuric acid
  2. H2S2O8, peroxodisulphuric acid
  3. H2S2O7, pyrosulphuric acid
  4. H2SO3, sulphurous acid
Ques. 4NEET (UG) 2019

The correct structure of tribromooctaoxide is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5NEET (UG) 2019

Which is the correct thermal stability order for H2E (E = O, S, Se, Te and Po)?

  1. H2Po < H2Te < H2Se < H2S < H2O
  2. H2Se < H2Te < H2Po < H2O < H2S
  3. H2S < H2O < H2Se < H2Te < H2Po
  4. H2O < H2S < H2Se < H2Te < H2Po
Ques. 6NEET (UG) 2019

Match the following : Which of the following is the correct option?

  1. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
  2. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
  3. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
  4. (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
Ques. 7NEET (UG) 2019

Identify the incorrect statement related to PCl5 from the following :

  1. Axial P–Cl bonds are longer than equatorial P–Cl bonds
  2. PCl5 molecule is non-reactive
  3. Three equatorial P–Cl bonds make an angle of 120° with each other
  4. Two axial P–Cl bonds make an angle of 180° with each other
Ques. 8NEET (UG) 2019

Match the Xenon compounds in Column-I with its structure in Column-II and assign the correct code :

  1. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
  2. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
  3. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
  4. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
Ques. 9NEET 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.
Ques. 10NEET 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. 11NEET 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-

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