CORRECT-INCORRECT STATEMENT Select the correct statement concerning alkali metals. (1) Melting p...

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CORRECT-INCORRECT STATEMENT
Select the correct statement concerning alkali metals.
(1) Melting points decrease with increasing atomic number.
(2) Density of potassium is less than sodium
(3) Salts of Li to Cs impart characteristic colour to an oxidising flame. (of Bunsen burner)
(4) All of these
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