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Question

NaOH(aq.), HCl(aq) and NaCl(aq.) have concentration of 10−3M each. Their pH will be respectively:

A
10,6,2
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B
11,3,7
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C
10,3,7
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D
10,4,7
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Solution

The correct option is B 11,3,7
HCl is strong acid so it dissociates completely to give [H+] ions whose concentration is 103M.
As we know pH=log([H+])=3
NaOH is strong base so it dissociates completely to give [OH] ions whose concentration is 103M.
As we know pOH=log([OH])=3
We also know that pH+pOH=14 so pH=11
NaCl is salt os strong acid and strong base so it is neutral in nature so its pH=7.

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