Question

The pair of ions which give the same flame colour in flame test are

(A)

(B)

Ca?+ &Mg²+

Ca2+ & Ba2+

(C) Li+&Ca+2

(D) Lit & Sr2+​

Answer 1

Answer:

If the colour of the flame obtained by performing the flame test of a substance with the help of platinum wire and concentrated HCl is violet, then the basic radical in the salt is potassium.

Note: In the flame test, barium, potassium, calcium and sodium gives apple green, violet, brick red and golden yellow colors respectively.

Explanation:

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Answer 2

The pair of ions that give the same flame colour in flame test are- (C) Li+ and Ca+2.

Both give a reddish flame.

• Flame test is used to detect the presence of certain metal ions in a compound.
• It is based on the emission spectrum of an element.
• Each of the metal ions give a characteristic flame colour, which helps to identify them. Some of the colours are given below-

1. Ca2+ - orangish red
2. Ba2+ - green
3. Mg2+ - white
4. Li+ - Red.