Of the ions `Ag^(+),Co^(2+)` and `Ti^(4+)` ,which ones will be coloured in aqueous solutions. (Atomic numbers:)
Ag = 47 , Co = 27, Ti = 22)
(b) If each one of the above ionic species is in turn placed in magnetic field, how will it respond and why?

Among [Ag(NH_3)_2]Cl, [Ni(CN)_4]^(2-) and [CuCl_4]^(2-) which remains colourless in aqueous solutions and why? (Atomic number of Ag=47, Ni = 28, Cu= 29).

Amongst TiF_6^(2-), CoF_6^(3-), Cu_2Cl_2" and " NiCl_4^(2-) , which are the colourless species ? (atomic number of Ti = 22 , Co = 27, Cu = 29, Ni = 28)

The aqueous solution containing which one of the following ions will be colourless (Atomic number Sc = 21, Fe = 26, Ti = 22, Mn = 25)

Which one of the following forms a colourless solution in aqueous medium ? (Atomic number : Sc =21, Ti = 22, V = 23 , and Cr = 24 )

of the ions Co^(2+), Sc^(3+) and Cr^(3+) which one will give coloured aqueous solutions and how will each of them respond a magnetic field and why ? ( Atomic numbers : Co, = 27, Sc= 21 ,Cr = 24)

Explain the following : (a) Out of Sc^(3+), Co^(2+) " and "Cr^(3+) "ions, only "Sc^(3+) is colourless in aqueous solutions. (Atomic no.: Co =27, Sc = 21 and Cr =24) (b) The E^(@)Cu^(2+)//Cu for copper metal is positive (+0.34), unlike the remaining members of the first transition series. (c) La(OH)_(3) " is more basic than Lu "(OH)_(3).

Predict which of the followingwill be coloured in aqueous solution? Ti^(3+),V^(3+),Cu^(o+),Sc^(3+),Mn^(2+),Fe^(2+) and Co^(2+) Give reasons for each.

In which of the following paris both the ions are coloured in aqueous solution? (Atomic number, Sc - 21, Ti = 22, Ni = 28, Cu = 29, Co = 27) (a) Ni^(2+), Ti^(3+) (b) Sc^(3+),Ti^(3+) (c) Sc^(3+),Co^(2+) (d) Ni^(2+),Cu^(+)

Which group contains coloured ions out of the following ? 1. Cu^+ 2. Ti^(4+) 3. Co^(2+) 4. Fe^(2+)

(a) (i) How is the variability in oxidation states of transition metals different from that of the p-block elements ? (ii) Out of Cu^(+) and Cu^(2+) , which ion is unstable in aqueous solution and why ? (iii) Orange colour of Cr_(2)O_(7)^(2-) ion changes to yellow when treated with an alkali. Why ? (b) Chemistry of actinoids is complicated as compared to lanthanoids. Give two reasons.