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Which pair of ions produce different colours in a flame test? A - HSC - SSCE Chemistry - Question 8 - 2024 - Paper 1
Question 8
Which pair of ions produce different colours in a flame test? A. Br⁻ and Cl⁻ B. Ag⁺ and OH⁻ C. Cu²⁺ and Ca²⁺ D. CH₃COO⁻ and H₂PO₄⁻
Worked Solution & Example Answer:Which pair of ions produce different colours in a flame test? A - HSC - SSCE Chemistry - Question 8 - 2024 - Paper 1
Step 1
C. Cu²⁺ and Ca²⁺
Answer
The flame test is a qualitative analysis technique used to identify the presence of certain metal ions based on the characteristic colors they emit when heated in a flame.
- Copper (II) ions (Cu²⁺): When copper(II) salts are placed in a flame, they produce a green or blue-green color.
- Calcium ions (Ca²⁺): Calcium salts, on the other hand, produce a brick-red flame.
These distinct flame colors indicate that Cu²⁺ and Ca²⁺ ions indeed produce different colors in a flame test, making them the correct answer.