MCQ
The unit of entropy is
- A$J\,mo{l^{ - 1}}$
- B$J\,K\,mo{l^{ - 1}}$
- ✓$J\,mo{l^{ - 1}}\,{K^{ - 1}}$
- D${J^{ - 1}}\,{K^{ - 1}}\,mo{l^1}$
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$x\ MnO + y\ PbO_2 + z\ HNO_3 \to a\ HMnO_4 + b\ Pb(NO_3 )_2 + c\ H_2O$
$(A)$ The $pH$ of $1 \times 10^{-8}\,M\,HCl$ solution is $8$.
$(B)$ The conjugate base $H _2 PO _4^{-}$is $HPO _4{ }^{2-}$.
$(C)$ $K _{ w }$ increases with increase in temperature.
$(D)$ When a solution of weak monoprotic acid is titrated against a strong base at half neutralisation point, $pH =\frac{1}{2} pK _{ a }$
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