1.

\[{{H}_{4}}{{O}^{+}}\]of a solution is 4. The hydroxide ion concentration of the solution would be [NCERT 1981; CBSE PMT 1991; MP PMT 1994]

A.                 \[{{10}^{-4}}\]  
B.                 \[{{10}^{-10}}\]
C.                 \[{{10}^{-2}}\]  
D.                 \[{{10}^{-12}}\]
Answer» C.                 \[{{10}^{-2}}\]  


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