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For the simple hydrides,MHn,pKa values decrease in the order:

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For the simple hydrides,MHn,pKa values decrease in the order: 

(A) CH4 > NH3 > H2O > H2S > HBr 

(B) HBr > H2S > H2O > NH3 > CH4 

(C) HBr > H2O > NH3 > H2S > CH4 

(D) NH3 > H2S > CH4 > H2O > HBr 

(E) H2S > H2O > HBr > NH3 > CH4

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(A) CH4 > NH3 > H2O > H2S > HBr 

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