Out of `Cu^+` and `V^+2` which will be coloured and why ? (Atomic number Of V is 23 and Cu is 29).

Out of Ag^+ and Co^(2+) which one will be coloured and why? (Atomic number of Ag is, 47 and Co is 27).

Out of Cu^(2+) and Cu^(+) ion, which one is colourless and why?

Out of Cu_2 Cl_2 and CuCl_2 which is more stable and why ?

Out of V^(2+) and V^(3+) which is more paramagnetic and why ?

Out of the ions Ni^(2+) , Zn^(2+) and Cu^2+) , which will give coloured aqueous solution and what will be the magnetic beghaviour of each ion ? (Atomic number of Ni = 28, Zn =30 and Cu = 29).

Out of Co^(2+) , Zn^(2+) and Cu^+(2+) which will give aqueous coloured solution ?

Which of the Ni^(2+) , Ti^(3+) and Cu^(2+) are expected to be coloured and why ?

Out of the given alloys, which one is made from Cu, Fe and Ni?

Why Cu(l) is colourless and Cu(ll) is blue in colour ?