A chloride dissolves appreciably in cold water. When placed in a platinum wire in Bunsen flame no distinctive colour is noticed. Which cation could be present –
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(A). is hygroscopic and fumes in air due to hydrolysis. It is also covalent in nature due to small size and relatively high charge on ion. Due to small size electrons in Be are tightly held by nuclear forces and they are not excited to higher energy levels. Thus Be does not give flame colouration.