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In laboratory K(2)Cr(2)O(7) is used main...

In laboratory `K_(2)Cr_(2)O_(7)` is used mainly not `Na_(2)Cr_(2)O_(7).` Why?

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`Na_(2)Cr_(2)O_(7)` is deliquescent enough and changes its concetration and can not be taken as primary standard solution whereas `K_(2)Cr_(2)O_(7)` has no water of crystallisation and not deliquescent.
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