The correct statement(s) about transition elements is/are:  

1. The lowest oxide of a transition metal is basic, the highest is amphoteric/acidic.
2. A transition metal exhibits the highest oxidation state in oxides and fluorides.
3. The highest oxidation state is exhibited in the oxoanions of a metal.
4. All of the above.

Subtopic:  d-Block Elements- Properties & Uses |
 90%
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Which of the following statements is false?  

1. Cr2+ is strongly oxidizing while manganese(III) is strongly reducing.
2. Cobalt(II) is stable in an aqueous solution but in the presence of complexing reagents, it is easily oxidized.
3. The d1 configuration is very unstable in ions.
4. None of the above.

Subtopic:  d-Block Elements- Properties & Uses |
 64%
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The E°(M2+/M) value for copper is positive (+0.34 V), because  

1.  Copper has a high energy of atomization and a low hydration energy
2. Copper has low energy of atomization and high hydration energy.
3. Copper has equal energy of atomization and hydration energy.
4. None of the above.

Subtopic:  d-Block Elements- Properties & Uses |
 59%
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The correct trend for I.E(1st Ionization Enthalpy) in the 3d series is: 

1. Ionisation energy regularly decreases on moving along the period.
2. Ionisation energy regularly increases on moving along the period.
3. An irregular trend is observed for ionization energy because of electronic configuration.
4. None of the above.

Subtopic:  d-Block Elements- Properties & Uses |
 72%
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The correct statement(s) regarding the oxidation state of transition elements is/are:

1. The oxidation state can vary from +1 to +7 2. Variable oxidation states are possible.
3. Both (1) and (2)  4. None of the above
Subtopic:  d-Block Elements- Properties & Uses |
 91%
From NCERT
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The reaction(s) involved in the preparation of potassium dichromate from iron chromite ore is/are:

1. FeCr2O+ NaOH + O→ Na2CrO4 + Fe2O3 + H2O
2. Na2CrO+ H2SO4 (conc.) →
Na2Cr2O+ Na2SO+ H2O
3. Na2Cr2O+ KCl→ K2Cr2O7 + NaCl 
4. All of the above.
Subtopic:  Chemistry of Mn and Cr Compounds |
 86%
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An incorrect statement regarding the stability of oxidation state for the elements of the 3d series is:  

1. The number of oxidation states increases on moving from Sc to Mn. 
2. The relative stability of the +2 oxidation state increases on moving from top to bottom.
3. The relative stability of the +2 oxidation state decreases on moving from top to bottom.
4. Both (1) and (2) 

Subtopic:  d-Block Elements- Properties & Uses |
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For M2+/M, and M3+/M2+, the E° values of some metals are given in the table below:

Cr+2/Cr = -0.9 V Cr+3/Cr+2 = -0.4V
Mn+2/Mn = -1.2V Mn+3/Mn+2 = +1.5 V
Fe+2/Fe = -0.4V Fe+3/Fe+2 = +0.8 V

The correct inference(s) from the above data is/are: 

1. The increasing order of their stability is Mn3+< Fe3+< Cr3+   
2. The increasing order of the above-mentioned metals ability to get oxidized is: Fe < Cr < Mn
3. The increasing order of the above-mentioned metals ability to get oxidized is: Fe > Cr > Mn
4. Both 1 and 2 
Subtopic:  d-Block Elements- Properties & Uses |
 66%
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Consider the following graph.

Based on the graph above, it can be concluded that the element with a melting point higher than 3000 K will be:

1. Y 2. X
3. Z 4. None of the above
Subtopic:  d-Block Elements- Properties & Uses |
 89%
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The most common oxidation state for lanthanoids and actinoids is:

1. +5

2. -3

3. +1

4. +3

Subtopic:  f-Block Elements- Properties & Uses |
 93%
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