The correct statement(s) about transition elements are:  

1. +2, and +3 oxidation states are more common for elements in the first transition series, while higher oxidation states are more common for the heavier elements.
2. The heavier transition elements form low-spin complexes only.
3. The atomic sizes of the elements of the first transition series are smaller than those of the heavier elements (elements of 2nd and 3r transition series).
4. All of the above.

Subtopic:  d-Block Elements- Properties & Uses |
 87%
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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 |
 92%
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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%
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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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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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Match the following:

Ions  Number of unpaired electrons
i. Mn3+ a. 2
ii. Cr3+ b. 4
iii. V3+ c. 1
iv. Ti3+ d. 3
 
i ii iii iv
1. c d b a
2. b d a c
3. d b a c
4. b d c a
Subtopic:  d-Block Elements- Properties & Uses |
 80%
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The correct statement(s) about interstitial compounds is/are:

1. Transition elements are large in size and contain multiple interstitial sites.
2. Transition elements can trap atoms of other elements.
3. Interstitial compounds are chemically inert.
4. All of the above.

Subtopic:  d-Block Elements- Properties & Uses |
 91%
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Transition metals show paramagnetic behaviour due to:

1. Paired electrons in the (n-1) d-orbitals 2. Unpaired electrons in the (n-1) d-orbitals
3. Due to \(d^{10},\) and ​​​​​​​\(d^{0}\) configuration 4. None of the above

Subtopic:  d-Block Elements- Properties & Uses |
 93%
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Transition metals and their many compounds act as good catalysts due to :

1. Variable oxidation states 2. Unstable intermediate
3. Provide a suitable surface 4. All of the above
Subtopic:  d-Block Elements- Properties & Uses |
 83%
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