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

NEET (UG) 2020MCQEasy📈 Topic in 50% papers+4−1
1

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

Answer

(1) [Cu(NH3)4]2+

Solution

As per NCERT (preparation of ammonia), urea is hydrolysed to ammonium carbonate (A), which decomposes to ammonia (B):

NH2CONH2 + 2H2O (NH4)2CO3

(NH4)2CO3 2NH3 + H2O + CO2

Ammonia forms a deep blue complex with Cu2+ ions:

Cu2+(aq) + 4NH3(aq) [Cu(NH3)4]2+(aq) (deep blue)

∴ C is [Cu(NH3)4]2+.

Answer: (1)

NEET (UG) 2020

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

2

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
3

The correct structure of tribromooctaoxide is :

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

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
5

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
6

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
7

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
8

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
9

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
10

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
11

Name the gas that can readily decolourise acidified KMnO4 solution.

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

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