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Which of the following statement is not true for the reaction given below?
\[
\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}+4 \mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}+4 \mathrm{H}_{2} \mathrm{O}
\]
P
(a) It is a ligand substitution reaction.
W
(b) \( \mathrm{NH}_{3} \) is a relatively strong field ligand while \( \mathrm{H}_{2} \mathrm{O} \) is a weak field ligand.
(c) During the reaction, there is a change in colour from light blue to dark blue.
(d) \( \left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \), has a tetrahedral structure and is paramagnetic.
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