Action of heat along with mixing of Sodium hydrogen phosphate is used to test

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Ca2+

Cu2+

Mg2+

Na+

answer is C.

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Detailed Solution

Take water extract and add 3-4 ml of magnesium mixture and wait for 5 minutes. A white ppt confirms Na2HPO4+MgNO32+NH3→MgNH4PO4↓+2NaNO3 White

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