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 

Subtopic:  f-Block Elements- Properties & Uses |
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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

Subtopic:  Chemistry of Mn and Cr Compounds |
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The lanthanide contraction is responsible for the fact that:

1. Zr and Y have about the same radius .

2. Zr and Zn have the same oxidation state.  

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

4. Zr and Nb have a similar oxidation state.

Subtopic:  Lanthanoid & Actinoids Contraction |
 93%
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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 d5 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.

Subtopic:  d-Block Elements- Properties & Uses |
 65%
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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.

Subtopic:  Lanthanoid & Actinoids Contraction |
 55%
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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)
Subtopic:  d-Block Elements- Properties & Uses |
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The incorrect statement among the following is: 

1. Zirconium and Hofnium have identical radii of 160 pm and 159 pm, respectively, as a consequence of lanthanoid contraction.
2. Lanthanoids reveal only a +3 oxidation state.
3. Lanthanoid ions, other than the f0 type and the f14 type, are all paramagnetic.
4. The overall decrease in atomic and ionic radii from lanthanum to lutetium is called lanthanoid contraction.

Subtopic:  f-Block Elements- Properties & Uses |
 75%
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What is produced when excessive diluted nitric acid is combined with potassium chromate?

1. Cr2O72- and H2O  

2. Cr3+ and Cr2O72-  

3. CrO42-  

4. Cr2O42-  

Subtopic:  Chemistry of Mn and Cr Compounds |
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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 

Subtopic:  Chemistry of Mn and Cr Compounds |
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Incorrect statement among the following is  : 

1. La(OH)3 is less basic than Lu(OH)3

2. In lanthanoid series ionic radius of Ln3+ ions decreases.

3. La is actually an element of transition metal series rather than lanthanide series.

4. Atomic radii of Zr and Hf are same because of lanthanide contraction.

Subtopic:  f-Block Elements- Properties & Uses |
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