The actionoids
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CHXII08:THE D- & F-BLOCK ELEMENTS

321672 Among the following actinoids, the one that is not made passive by concentrated nitric acid is

1 \(\mathrm{\mathrm{Th}}\)
2 U
3 \(\mathrm{\mathrm{Pa}}\)
4 \(\mathrm{\mathrm{Pu}}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321673 Which of the following is man-made element?

1 \(\mathrm{Ra}\)
2 U
3 \(\mathrm{Np}\)
4 \(\mathrm{C}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321674 If M is element of actinoids series, the degree of complex formation decreases in the order

1 \(\mathrm{M}^{4+}>\mathrm{M}^{3+}>\mathrm{MO}_{2}^{2+}>\mathrm{MO}_{2}^{+}\)
2 \(\mathrm{M}^{4+}>\mathrm{MO}_{2}^{2+}>\mathrm{M}^{3+}>\mathrm{MO}_{2}^{+}\)
3 \(\mathrm{MO}_{2}^{+}>\mathrm{MO}_{2}^{2+}>\mathrm{M}^{3+}>\mathrm{M}^{4+}\)
4 \(\mathrm{MO}_{2}^{2+}>\mathrm{MO}_{2}^{+}>\mathrm{M}^{4+}>\mathrm{M}^{3+}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321675 Assertion :
The degree of complex formation in actinides decreases in the order
\(\mathrm{M}_{4}^{+}>\mathrm{MO}_{2}^{2+}>\mathrm{M}^{3+}>\mathrm{MO}_{2}^{+}\)
Reason :
Actinides form complexes with \(\pi\) bonding ligands such as alkyl phosphines and thioethers.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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CHXII08:THE D- & F-BLOCK ELEMENTS

321672 Among the following actinoids, the one that is not made passive by concentrated nitric acid is

1 \(\mathrm{\mathrm{Th}}\)
2 U
3 \(\mathrm{\mathrm{Pa}}\)
4 \(\mathrm{\mathrm{Pu}}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321673 Which of the following is man-made element?

1 \(\mathrm{Ra}\)
2 U
3 \(\mathrm{Np}\)
4 \(\mathrm{C}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321674 If M is element of actinoids series, the degree of complex formation decreases in the order

1 \(\mathrm{M}^{4+}>\mathrm{M}^{3+}>\mathrm{MO}_{2}^{2+}>\mathrm{MO}_{2}^{+}\)
2 \(\mathrm{M}^{4+}>\mathrm{MO}_{2}^{2+}>\mathrm{M}^{3+}>\mathrm{MO}_{2}^{+}\)
3 \(\mathrm{MO}_{2}^{+}>\mathrm{MO}_{2}^{2+}>\mathrm{M}^{3+}>\mathrm{M}^{4+}\)
4 \(\mathrm{MO}_{2}^{2+}>\mathrm{MO}_{2}^{+}>\mathrm{M}^{4+}>\mathrm{M}^{3+}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321675 Assertion :
The degree of complex formation in actinides decreases in the order
\(\mathrm{M}_{4}^{+}>\mathrm{MO}_{2}^{2+}>\mathrm{M}^{3+}>\mathrm{MO}_{2}^{+}\)
Reason :
Actinides form complexes with \(\pi\) bonding ligands such as alkyl phosphines and thioethers.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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CHXII08:THE D- & F-BLOCK ELEMENTS

321672 Among the following actinoids, the one that is not made passive by concentrated nitric acid is

1 \(\mathrm{\mathrm{Th}}\)
2 U
3 \(\mathrm{\mathrm{Pa}}\)
4 \(\mathrm{\mathrm{Pu}}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321673 Which of the following is man-made element?

1 \(\mathrm{Ra}\)
2 U
3 \(\mathrm{Np}\)
4 \(\mathrm{C}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321674 If M is element of actinoids series, the degree of complex formation decreases in the order

1 \(\mathrm{M}^{4+}>\mathrm{M}^{3+}>\mathrm{MO}_{2}^{2+}>\mathrm{MO}_{2}^{+}\)
2 \(\mathrm{M}^{4+}>\mathrm{MO}_{2}^{2+}>\mathrm{M}^{3+}>\mathrm{MO}_{2}^{+}\)
3 \(\mathrm{MO}_{2}^{+}>\mathrm{MO}_{2}^{2+}>\mathrm{M}^{3+}>\mathrm{M}^{4+}\)
4 \(\mathrm{MO}_{2}^{2+}>\mathrm{MO}_{2}^{+}>\mathrm{M}^{4+}>\mathrm{M}^{3+}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321675 Assertion :
The degree of complex formation in actinides decreases in the order
\(\mathrm{M}_{4}^{+}>\mathrm{MO}_{2}^{2+}>\mathrm{M}^{3+}>\mathrm{MO}_{2}^{+}\)
Reason :
Actinides form complexes with \(\pi\) bonding ligands such as alkyl phosphines and thioethers.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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CHXII08:THE D- & F-BLOCK ELEMENTS

321672 Among the following actinoids, the one that is not made passive by concentrated nitric acid is

1 \(\mathrm{\mathrm{Th}}\)
2 U
3 \(\mathrm{\mathrm{Pa}}\)
4 \(\mathrm{\mathrm{Pu}}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321673 Which of the following is man-made element?

1 \(\mathrm{Ra}\)
2 U
3 \(\mathrm{Np}\)
4 \(\mathrm{C}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321674 If M is element of actinoids series, the degree of complex formation decreases in the order

1 \(\mathrm{M}^{4+}>\mathrm{M}^{3+}>\mathrm{MO}_{2}^{2+}>\mathrm{MO}_{2}^{+}\)
2 \(\mathrm{M}^{4+}>\mathrm{MO}_{2}^{2+}>\mathrm{M}^{3+}>\mathrm{MO}_{2}^{+}\)
3 \(\mathrm{MO}_{2}^{+}>\mathrm{MO}_{2}^{2+}>\mathrm{M}^{3+}>\mathrm{M}^{4+}\)
4 \(\mathrm{MO}_{2}^{2+}>\mathrm{MO}_{2}^{+}>\mathrm{M}^{4+}>\mathrm{M}^{3+}\)
CHXII08:THE D- & F-BLOCK ELEMENTS

321675 Assertion :
The degree of complex formation in actinides decreases in the order
\(\mathrm{M}_{4}^{+}>\mathrm{MO}_{2}^{2+}>\mathrm{M}^{3+}>\mathrm{MO}_{2}^{+}\)
Reason :
Actinides form complexes with \(\pi\) bonding ligands such as alkyl phosphines and thioethers.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
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