Comprehension
Read the following passage and answer the next five questions based on it.
Transition Series Elements:
Transition Series Elements:
Sc Ti V Cr Mn Fe Co Ni Cu Zn
Y Zr Nb Mo Tc Ru Rh Pd Ag Cd
La Hf Ta W Re Os Ir Pt Au Hg
In any transition series, as we move from left to right the d-orbitals are progressively filled and their properties vary accordingly.
f-block Elements:
Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr
The above are the two series of f-block elements in which the chemical properties won’t change much. The 5f-series elements are radioactive in nature and mostly are artificially synthesized in laboratories and thus much is not known about their chemical properties.
Question: 1
Identify the incorrect statement:
Identify the incorrect statement:
Updated On: Feb 26, 2025
- Second ionization enthalpy...
- Zr and Hf share...
- Melting point of Mn...
- Interstitial compounds...
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The Correct Option is A
Solution and Explanation
The incorrect statement is (1). The second ionization enthalpy of Pd is higher than Ag due to the stability of Pd’s d10 configuration.
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Question: 2
Which of the following is the correct order of second ionization enthalpy?
Which of the following is the correct order of second ionization enthalpy?
Updated On: Feb 26, 2025
- V $>$ Cr $>$ Mn
- V $<$ Cr $<$ Mn
- V $<$ Cr $>$ Mn
- V $>$ Cr $<$ Mn
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The Correct Option is C
Solution and Explanation
Cr has a stable half-filled d5 configuration, making it harder to ionize than V and Mn, so the order of second ionization enthalpy is V $<$ Cr $>$ Mn.
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Question: 3
Which of the following pair of compounds exhibits the same colour in aqueous solution?
Which of the following pair of compounds exhibits the same colour in aqueous solution?
Updated On: Feb 26, 2025
- FeCl$_2$, CuCl$_2$
- VOCl$_2$, FeCl$_2$
- VOCl$_2$, CuCl$_2$
- VOCl$_2$, MnCl$_2$
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The Correct Option is B
Solution and Explanation
FeCl$_2$ and VOCl$_2$ both exhibit a green color in aqueous solution due to similar d-electron configurations.
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Question: 4
Which metal has the highest oxidation state in the first-row transition series?
Which metal has the highest oxidation state in the first-row transition series?
Updated On: Feb 26, 2025
- Cr
- Fe
- Mn
- V
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The Correct Option is C
Solution and Explanation
Mn has the highest oxidation state (+7) in the first row of transition elements, as seen in compounds like KMnO$_4$.
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Question: 5
Why do the actinoids exhibit a higher number of oxidation states than lanthanoids?
Why do the actinoids exhibit a higher number of oxidation states than lanthanoids?
Updated On: Feb 26, 2025
- 4f orbitals are more diffused
- Energy difference...
- Energy difference...
- Actinoids are more...
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The Correct Option is B
Solution and Explanation
Actinoids exhibit a higher number of oxidation states because the energy difference between 5f and 6d is less compared to the difference between 4f and 5d orbitals in lanthanoids
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