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p-Block Elements (Group 15–18) · Question 17

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

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)

NEET (UG) 2021

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

2

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
NEET (UG) 2020
3

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
NEET (UG) 2020
4

The correct structure of tribromooctaoxide is :

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

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
NEET (UG) 2019
6

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)
NEET (UG) 2019
7

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
NEET (UG) 2019
8

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)
NEET (UG) 2019
9

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.
NEET 2018
10

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)
NEET 2017
11

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

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

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