An unknown metal X when placed in copper sulphate solution, red brown – McqOptions

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1.	An unknown metal X when placed in copper sulphate solution, red brown pieces of copper fall to the bottom of the test tube.When metal X is placed in aluminium sulphate solution, no change is observed. Metal X can be
A.	Sodium
B.	Potassium
C.	Iron
D.	Calcium.
Answer» D. Calcium.

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