Question

The element whose salts cannot be detected by flame test is:

• A. $Mg$
• B. $Na$
• C. $Cu$
• D. $Sr$

Answer 1

The correct option is A $Mg$

Salts	Colour in flame test
Sodium	Yellow
Strontium	Crimson red
Copper halide	Blue green
Copper	Green

Among the given metals magnesium salts cannot produce any colour in flame test.