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How many of the following metal chloride...

How many of the following metal chlorides impart characteristic colour to the lower oxidising flame?
LiCl, NaCl, KCl, `BeCl_(2), MgCl_(2), CaCl_(2), SrCl_(2), BaCl_(2)`

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The correct Answer is:
7
`MgCl_2` and `BeCl_2` do not impart colour to the oxidising flame on account of higher ionization energies of Be and Mg.
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