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Q.

Which pair of the following chlorides do not impart colour to the flame.

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a

BeCl2  and SrCl2

b

BeCl2  and MgCl2

c

CaCl2 and BaCl2

d

BaCl2  and SrCl2

answer is B.

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high heat required for Be and Mg which is not available from flame colours
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