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Q.

pH of 0.1 M Na2HPO4 and  0.2 M NaH2PO4 are respectively: pKafor H3PO4 are 2.2, 7.2 and 12.0)

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a

9.6, 4.7

b

4.7, 5.6

c

5.6, 4.7

d

4.7, 9.6

answer is B.

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Detailed Solution

pH of 0.1 M Na2HPO4  

pH2NaH2PO4=2.2+7.22=4.7

pH of  0.2 M NaH2PO4 

pH2NaH2PO4=2.2+7.22=9.6

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