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Counter-Strike: Source (2004)

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When ammonia is added to a cupric salt solution, the deep blue colour is observed it is due to the formation of :
(a) \( \left[\mathrm{Cu}(\mathrm{OH})_{4}\right]^{2-} \)
(b) \( \left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \)
(c) \( \left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2}\left(\mathrm{NH}_{3}\right)_{2}\right]^{2+} \)
(d) \( \left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+} \)
\( P \)
W
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