Salt Analysis Mcqs

Salt analysis, also known as qualitative inorganic analysis, is a systematic method used to identify the cations and anions in an inorganic salt. This process involves preliminary tests, dry tests, and wet tests to determine the composition of unknown compounds. It plays a crucial role in chemistry labs, helping students and researchers analyze various salts efficiently.

1. Basic Concept of Salt Analysis

  1. What is the positively charged part of a salt called?
    • a) Acidic radical
    • b) Basic radical
    • c) Neutral radical
    • d) Amphoteric radical
      (Answer: b) Basic radical
  2. Which of the following is an example of an acidic radical?
    • a) Na⁺
    • b) Cl⁻
    • c) Zn²⁺
    • d) NH₄⁺
      (Answer: b) Cl⁻

2. Physical Appearance of Inorganic Salts

  1. Which of the following cations imparts a blue color to the inorganic salt?
    • a) Cu²⁺
    • b) Fe²⁺
    • c) Mn²⁺
    • d) Co²⁺
      (Answer: a) Cu²⁺
  2. Which cation is responsible for a light pink color in inorganic salts?
    • a) Ni²⁺
    • b) Mn²⁺
    • c) Cr³⁺
    • d) Fe³⁺
      (Answer: b) Mn²⁺

3. Action of Heat

  1. Which of the following carbonates does NOT decompose on heating?
    • a) Li₂CO₃
    • b) Na₂CO₃
    • c) MgCO₃
    • d) CaCO₃
      (Answer: b) Na₂CO₃
  2. On heating, ammonium nitrate decomposes to form:
    • a) NO₂ and O₂
    • b) NH₃ and H₂O
    • c) N₂O and H₂O
    • d) N₂ and O₂
      (Answer: c) N₂O and H₂O

4. Solubility of Salts

  1. Which of the following salts is insoluble in water?
    • a) NaNO₃
    • b) PbSO₄
    • c) CaCl₂
    • d) K₂CO₃
      (Answer: b) PbSO₄
  2. Which of the following halides is least soluble in water?
    • a) AgCl
    • b) AgBr
    • c) AgI
    • d) AgF
      (Answer: c) AgI

5. Flame Tests

  1. Which metal ion gives a crimson red flame in the flame test?
    • a) Ba²⁺
    • b) Sr²⁺
    • c) K⁺
    • d) Ca²⁺
      (Answer: b) Sr²⁺
  2. The apple-green flame in a flame test is characteristic of which metal ion?
  • a) Na⁺
  • b) K⁺
  • c) Ba²⁺
  • d) Li⁺
    (Answer: c) Ba²⁺

6. Dry Tests

  1. Which test is NOT included in dry tests for salt analysis?
  • a) Flame test
  • b) Borax bead test
  • c) Charcoal cavity test
  • d) Brown ring test
    (Answer: d) Brown ring test
  1. What color does cobalt nitrate impart to aluminum salts in the charcoal cavity test?
  • a) Green
  • b) Blue
  • c) Pink
  • d) White
    (Answer: b) Blue

7. Borax Bead Test

  1. In the borax bead test, which metal ion gives a blue bead in an oxidizing flame?
  • a) Cu²⁺
  • b) Fe²⁺
  • c) Co²⁺
  • d) Mn²⁺
    (Answer: c) Co²⁺
  1. Which metal ion gives an amethyst-red color in the borax bead test?
  • a) Ni²⁺
  • b) Mn²⁺
  • c) Cu²⁺
  • d) Fe³⁺
    (Answer: b) Mn²⁺

8. Acid Radical Tests

  1. Which gas is evolved when carbonates react with dilute acids?
  • a) SO₂
  • b) NO₂
  • c) CO₂
  • d) H₂S
    (Answer: c) CO₂
  1. Which test confirms the presence of chloride ions (Cl⁻)?
  • a) Brown ring test
  • b) Chromyl chloride test
  • c) Borax bead test
  • d) Nessler’s test
    (Answer: b) Chromyl chloride test
  1. Which acid radical gives a rotten egg smell upon reaction with dilute acid?
  • a) SO₄²⁻
  • b) CO₃²⁻
  • c) S²⁻
  • d) NO₃⁻
    (Answer: c) S²⁻

9. Group Analysis of Cations

  1. Which group of cations precipitates as sulfides in acidic medium?
  • a) Group I
  • b) Group II
  • c) Group III
  • d) Group IV
    (Answer: b) Group II
  1. What is the characteristic color of ferric hydroxide precipitate?
  • a) Green
  • b) Red-brown
  • c) Blue
  • d) White
    (Answer: b) Red-brown
  1. In group III analysis, aluminum ions are confirmed using which reagent?
  • a) NaOH
  • b) NH₄OH
  • c) Na₂CO₃
  • d) K₄[Fe(CN)₆]
    (Answer: a) NaOH