In the chemical reaction, K2Cr207 + aH2SO4 + bSO2 → K2SO4 + Cr2(SO4)3 + cH20. a, b and c are
(1) 1, 3, 1
(2) 4, 1,4
(3) 3, 2, 3
(4) 2, 1, 2
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The answer is (1) 1,3,1
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