Which of the following compounds is colourless?
- A$Cu_2(CH_3COO)_4 \cdot 2H_2O$
- B$Cu_2Cl_2$
- C$CuSO_4 \cdot 5H_2O$
- D$[Cu(NH_3)_4]SO_4 \cdot 4H_2O$
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The electronic configuration of a metal element is given below:
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$M = 1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^1$
To which block does this element belong?
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