Colour

Q. The ability of d-block elements to form complexes is due to:

1. Vacant low energy orbital to accept lone pair of electrons from ligands
2. Small and highly charged ions
3. Both A & B are correct
4. None is correct

Q.

The magnetic moment of 'autocatalyst' formed in the reaction between acidified oxalic acid and potassium permanganate is

1. 5.9 BM
2. 4.9 BM
3. 3.9 BM
4. 2.8 BM

Q. Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?

1. The +3 oxidation state of cerium is more stable than the +4 oxidation state
2. The common oxidation states of cerium are +3 and +4
3. Cerium (IV) acts as an oxidizing agent.
4. The +4 oxidation state of cerium is not known in solutions

Q. Which of the following has tendency to act as an oxidizing agent?

1. $C{e}^{4+}$
2. $S{m}^{2+}$
3. $L{u}^{3+}$
4. $G{d}^{3+}$

Q. Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them

1. 
2. 
3. 
4. 

Q. Iron has the lowest oxidation state in

1. $K_4\left[Fe\right(CN{)}_6]$
2. $F{e}_2{O}_3$
3. $\left[Fe\right(CO{)}_5]$
4. $\left[Fe\right(C_2{O}_4{)}_3{]}^{3-}$

Q. Transition elements are coloured due to

1. Small size
2. Metallic nature
3. All
4. unpaired d – $e^{-}$

Q. The aqueous solution containing which one of the following ions will be colourless

1. 
2. 
3. 
4. 

Q. Which of the following pairs has almost same colour?

1. ${}_{60}N{d}^{3+},{}_{69}T{m}^{3+}$
2. ${}_{70}Y{b}^{3+},{}_{59}P{r}^{3+}$
3. ${}_{64}G{d}^{3+},{}_{67}H{o}^{3+}$
4. ${}_{63}E{u}^{3+},{}_{67}T{b}^{3+}$

Q. Which of the following set has all coloured ions

1. $C{u}^{+},C{u}^{2+},N{i}^{2+}$
2. $C{u}^{2+},C{o}^{2+},S{c}^{2+}$
3. $N{a}^{+},M{g}^{2+},A{l}^{3+}$
4. $Cu{2}^{+},F{e}^{2+},C{o}^{2+}$