Lesson eLearning

Which metal ion is responsible for producing a green colour in a flame test?

medium MCQ 2 marks Class 8 · Science · Combustion and Flame
  1. Sodium (Na⁺)
  2. Copper (Cu²⁺)
  3. Potassium (K⁺)
  4. Calcium (Ca²⁺)
Answer
Copper (Cu²⁺)

The correct answer is Copper (Cu²⁺) — Select the correct option.

Step-by-step solution

  1. Recall that flame colours arise from electronic excitation of metal ions.
  2. List common ions and their flame colours: Na⁺ – yellow, Cu²⁺ – green, K⁺ – violet, Ca²⁺ – orange.
  3. Identify the ion that gives green.
  4. Select the correct option.
Common mistake: Choosing sodium, which gives yellow, instead of copper for green

Concept tested: Flame test metal ions

Published · How this solution was prepared and checked

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