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How many of the following metal chlorides impart a characteristic colour to the oxidising flame? LiCl, NaCl, KCl, BeCl2, MgCl2, CaCl2, SrCl2, BaCl2

1. 1
2. 2
3. 3
4. 4

Correct answer: 4

Solution

LiCl (crimson), NaCl (golden yellow), CaCl2 (brick red), and SrCl2 (crimson red) are typically counted as giving 4 characteristic colours in the oxidising flame; KCl (violet) requires a blue cobalt glass filter and BeCl2/MgCl2 give no colour.

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