Which pair of the following chlorides do not impart colour to the flame? (a) \( \mathrm{BeCl}_{2...

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Which pair of the following chlorides do not impart colour to the flame?
(a) \( \mathrm{BeCl}_{2} \) and \( \mathrm{SrCl}_{2} \)
(b) \( \mathrm{BeCl}_{2} \) and \( \mathrm{MgCl}_{2} \)
(c) \( \mathrm{CaCl}_{2} \) and \( \mathrm{BaCl}_{2} \)
(d) \( \mathrm{BaCl}_{2} \) and \( \mathrm{SrCl}_{2} \)
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