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p-Block Elements appeared 42 times across 3 years — 4.9% of Chemistry. This question is from Group 15 Elements and Qualitative Analysis.

Year 2026 2025 2024 Total
Questions 16 13 13 42
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Identify the inorganic sulphides that are yellow in colour: (A) (NH₄)₂S (B) PbS (C) CuS (D) As₂S₃ (E) As₂S₅ Choose the correct answer from the options given below :

Solution & Explanation

Related Formula

Specific metal sulfide precipitates exhibit characteristic colors used in qualitative inorganic analysis schemes.

Core Logic

Evaluating the colors of the specified inorganic sulfides:

  • (NH₄)₂S (Ammonium sulfide solution / yellow ammonium sulfide compound matrix) arrow Yellow
  • PbS (Lead sulfide) arrow Black
  • CuS (Copper sulfide) arrow Black
  • As₂S₃ (Arsenic(III) sulfide) arrow Yellow
  • As₂S₅ (Arsenic(V) sulfide) arrow Yellow
Step 1: Identifying Valid Items

The sulfides matching the yellow color description are (A), (D), and (E).

Pattern Recognition

In qualitative salt analysis, arsenic belongs to Group IIB and precipitates as a bright yellow sulfide (As₂S₃). Transition metal sulfides like PbS and CuS typically form dark black precipitates.

Chapter Mix

Class 12 Chemistry: p-Block Elements

Reference Study Guides

P Block Elements

More p-Block Elements Previous-Year Questions — Page 9

Q61 jee_main_2024_31_jan_morning Group 18 Elements
Give below are two statements: Statement-I: Noble gases have very high boiling points. Statement-II: Noble gases are monoatomic gases. They are held together by strong dispersion forces. Because of this they are liquefied at very low temperature. Hence, they have very high boiling points. In the light of the above statements, choose the correct answer from the options given below:
  • A. Statement I is false but Statement II is true.
  • B. Both Statement I and Statement II are true.
  • C. Statement I is true but Statement II is false.
  • D. Both Statement I and Statement II are false.

Solution

Core Logic

Statement I and II are False.

Noble gases have low boiling points. Noble gases are held together by weak dispersion forces.

Pattern Recognition

Noble gases are characterized by extremely weak intermolecular forces (London dispersion forces) because they are monoatomic and non-polar, which directly results in very low boiling and melting points.

Chapter Mix

Class 12 Chemistry: The p-Block Elements

Q79 jee_main_2024_31_jan_morning Group 14 Elements
Consider the oxides of group 14 elements SiO₂, GeO₂, SnO₂, PbO₂, CO and GeO. The amphoteric oxides are
  • A. GeO, GeO₂
  • B. SiO₂, GeO₂
  • C. SnO₂, PbO₂
  • D. SnO₂, CO

Solution

Core Logic

In Group 14 elements, the nature of oxides varies down the group: CO is neutral. CO₂ and SiO₂ are acidic. GeO₂ is distinctly acidic. SnO₂ and PbO₂ are amphoteric.

Pattern Recognition

Tin (Sn) and Lead (Pb) mostly form amphoteric oxides (e.g., SnO, SnO₂, PbO, PbO₂), distinguishing them from the acidic oxides of Carbon and Silicon.

Chapter Mix

Class 11 Chemistry: The p-Block Elements

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JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)