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p-Block Elements (Group 15–18)

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

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)

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

Ques. 2NEET (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. 3NEET (UG) 2019

The correct structure of tribromooctaoxide is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 4NEET (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. 5NEET (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. 6NEET (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. 7NEET (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. 8NEET 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. 9NEET 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. 10NEET 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. 11NEET 2017

Name the gas that can readily decolourise acidified KMnO4 solution.

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

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