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Two metals (A) and (B) belong to the sam...

Two metals `(A)` and `(B)` belong to the same group of the periodic table. Metal `(A)` forms and insoluble oxide but a soluble sulphate, metal `(B)` forms a soluble oxide but an insoluble oxide but an insoluble sulphate. Both metals `(A)` and `(B)` form hydroxides which are soluble in alkalis. `(A)` and `(B)` are

A

`P=Be, Q=Ba`

B

`P=Mg, Q=Ca`

C

`P=Ca, Q=Sr`

D

`P=Ba, Q=Mg`

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