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Which of the following statements are correct?
(i) Ionic product of water \( \left(\mathrm{K}_{\mathrm{w}}\right)=\left[\mathrm{H}^{+}\right]\left[\mathrm{OH}^{-}\right]=10^{-14} \mathrm{M}^{2} \)
(ii) At \( 298 \mathrm{~K}\left[\mathrm{H}^{+}\right]=\left[\mathrm{OH}^{-}\right]=10^{-7} \)
(iii) \( \mathrm{K}_{\mathrm{W}} \) does not depends upon temperature
(iv) Molarity of pure water \( =55.55 \mathrm{M} \)
(a) (i), (ii) and (iii)
(b) (i), (ii) and (iv)
(c) (i) and (iv)
(d) (ii) and (iii)
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