Which of the following molecules is colourless?
- A$CuSO_4 \cdot 5 H_2 O$ (crystal)
- B$CuSO_4$ (anhydrous)
- C$\left[Cu(NH_3)_4\right]^{2+}_{(aq)}$
- D$\left[CuCl_4\right]^{2-}_{(aq)}$
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The overall complex dissociation equilibrium constant for the complex $[Cu(NH_3)_4]^{2+}$ ion will be (given $\beta_4$ for this complex is $2.1 \times 10^{13}$,where $\beta_4$ is the association constant).
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