The stability of Cu2+ is greater than that of Cu+ salts in an aqueous solution due to:

1. Second ionisation enthalpy 
2. First ionisation enthalpy 
3. Enthalpy of atomization 
4. Hydration energy 
Subtopic:  d-Block Elements- Properties & Uses |
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Which of the following statements is INCORRECT?
A. All the transition metals except scandium form MO oxides which are ionic.
B. The highest oxidation number corresponding to the group number
on transition metal oxides is attained in Sc2O3 to Mn2O7
C. Basic character increases from V2O3 to V2O4 to V2O5
D. V2O4 dissolves in acids to give VO43-
E. CrO is basic but Cr2O3 is amphoteric. 
Choose the correct answer from the options given below: 
1. B and C only 2. A and E only 
3. B and D only  4. C and D only
Subtopic:  d-Block Elements- Properties & Uses |
From NCERT
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Assertion (A): Ionization enthalpy increases along each series of transition elements from left to right. However, small variations occur. 
Reason (R): There is a corresponding increase in nuclear charge which accompanies the filling of electrons in the inner d-orbitals. 
 
1. (A) is correct but (R) is not correct 
2. (A) is not correct but (R) is correct
3. Both (A) and (R) are correct and (R) is the correct explanation of (A) 
4. Both (A) and (R) are correct but (R) is not the correct explanation of (A) 
Subtopic:  d-Block Elements- Properties & Uses |
 60%
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NEET - 2023
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Given below are two statements: 
Assertion (A): Ionisation enthalpies of early actinoids are lower than for early lanthanoids.
Reason (R): Electrons are entering 5f orbitals in actinoids which experience greater shielding from nuclear charge.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.
Subtopic:  f-Block Elements- Properties & Uses |
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NEET - 2023
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Gadolinium has a low value of third ionisation enthalpy because of:
1. high basic character 2. small size
3. high exchange enthalpy 4. high electronegativity
Subtopic:  f-Block Elements- Properties & Uses |
 66%
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NEET - 2022
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In the neutral or faintly alkaline medium, \(KMnO_4 \) oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from: 
1. +6 to +5  2. +7 to +4 
3. +6 to +4  4. +7 to +3
Subtopic:  d-Block Elements- Properties & Uses |
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Match the statements given in list I with the corresponding element given in list II:

List-I List-II
(a) Element that exhibits +3 oxidation state only. (i) Mn
(b) An element that exhibits more number of oxidation states. (ii) Zn
(c) Element which is a reducing agent in its +2 oxidation state. (iii) Sc
(d) An element that is not considered as a transition element. (iv) Cr
Choose the correct answer from the options given below:
(a) (b) (c) (d)
1. (iii) (iv) (i) (ii)
2. (iv) (i) (ii) (iii)
3. (ii) (iv) (iii) (i)
4. (iii) (i) (iv) (ii)
Subtopic:  d-Block Elements- Properties & Uses |
 79%
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Identify the pair of Lanthanoides with one strong oxidant and one strong reductant:

1. Ce(IV), Tb(IV)  2. Yb(II), Eu(II)
3. Eu(IV), Lu(III) 4. Ce(IV), Eu(II)
Subtopic:  d-Block Elements- Properties & Uses |
 66%
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The decrease in size from left to right in the actinoid series is greater and more gradual than that in the lanthanoid series due to:
 
1. 4f orbitals are penultimate
2. 4f orbitals have a greater shielding effect
3. 5f orbitals have a poor shielding effect
4. 5f orbitals have a greater shielding effect
Subtopic:  Lanthanoid & Actinoids Contraction |
 76%
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Given below are two statements:
I: Cr2+ is oxidising and Mn3+ is reducing in nature.
II: Sc3+ compounds are repelled by the applied magnetic field.
In light of the above statements, choose the most appropriate answer from the options given below:
1. Both I and II are correct.
2. Both I and II are incorrect.
3. I is correct but II is incorrect.
4. I is incorrect but II is correct.
Subtopic:  d-Block Elements- Properties & Uses |
From NCERT
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