Match the following characteristics to the appropriate metal:  

Column I - Aspects		Column II - Metal
(a)	The metal which reveals the maximum number of oxidation states	(i)	Scandium
(b)	The metal although placed in 3d block is considered not as a transition element	(ii)	Copper
(c)	The metal which does not exhibit variable oxidation states	(iii)	Manganese
(d)	The metal which in +1 oxidation state in aqueous solution undergoes disproportionation	(iv)	Zinc

Select the correct option :

	(a)	(b)	(c)	(d)
1.	(i)	(iv)	(ii)	(iii)
2.	(iii)	(iv)	(i)	(ii)
3.	(iii)	(i)	(iv)	(ii)
4.	(ii)	(iv)	(i)	(iii)

The incorrect statement among the following is: 

Knowing that the chemistry of lantanoids (Ln) is dominated by its+3 oxidation

state, which of the following statements is incorrect?

(1) The ionic sizes of Ln (III) decrease in general with increasing atomic

     number .

(2) Ln (III) compounds are generally colourless. 

(3) Ln (III) hydroxides are mainly basic in character.

(4) Because of the large size of the Ln (III) ions the bonding in its compounds

   is predominantly ionic in character.

In context with the transition elements, which of the

following statement is incorrect? 

(1) In the highest oxidation states, the transition metal show basic character

and cationic complex.

(2) In the highest oxidation states of the first five transition element (Sc to

Mn), all the 4s and 3d electrons are used for bonding.

(3) Once the d${}^5$ configuration is exceeded, the tendency to involve all the 3d

electrons in bonding decreases.

(4) In addition to the normal oxidation states, the zero oxidation state is also

shown by these elements in complex.

Which of the following is a result of the lanthanide contraction?

1. Zr and Y have nearly the same atomic radius.

2. Zr and Zn have the same oxidation state. 

3. Zr and Hf have nearly the same atomic radius.

4. Zr and Nb have similar oxidation states.

The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution will be:

1. +2

2. +3

3. +4

4. +6

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

(1) The common oxidation states of cerium are +3 and +4

(2) The +3 oxidation state of cerium is more stable than the +4 oxidation state 

(3) The +4 oxidation state of cerium is not known in solutions

(4) Cerium (IV) acts an oxidizing agent 

What is produced when excessive diluted nitric acid is combined with potassium chromate?

1. Cr₂O₇^2- and H₂O  

2. Cr³⁺ and Cr₂O₇^2-  

3. CrO₄^2-  

4. Cr₂O₄^2-  

When the sample of copper with zinc impurity is to be purified by electrolysis,

the appropriate electrodes are 
 

Cathode                          Anode 

(1) pure zine                     pure copper       

(2) pure copper                 impure sample 

(3) impure zinc                  impure sample 

(4) impure sample             pure copper 

An example of the effect of the concentration of nitric acid on the formation of oxidation products would be:

1. 3Cu + 8HNO_3(conc.)   →   3Cu(NO₃)₂   +   2NO   +   4H₂O

2. Cu   +   4HNO_{3 (conc.)}   →   Cu(NO₃)₂   +   2NO₂   +   2H₂O

3. Both (1), and (2)

4. None of the above