Q.

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

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a

Ba and Mg

b

Na and K

c

Mg and Ba

d

K and Rb

answer is C.

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Detailed Solution

MgO is insoluble,  MgSO4 is soluble, whereas BaO is soluble and BaSO4 is insoluble.
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Two metals (A) and (B) belong to the same group of the periodic table. Metal (A) forms an insoluble oxide but a soluble sulphate, metal (B) forms a soluble oxide but aninsoluble sulphate. Both metals (A) and (B) form hydroxides which are soluble in alkalis. (A) and (B) are