JEE Advanced 2020 Full Test 6 Paper 2

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Question : 20 of 54
 
Marks: +1, -0
If the number of oxygen atom(s) present in hydrated (P) is:
(P)
H2SO4
(Q)
+BaSO4
+H2O

(Q)+H2SO4+KIK2SO4+H2O+
S
(R)
Starch Blue colured
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