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

321730 What factor make the separation of Lanthanoids a formidable task?

1 Similarity in ionic size
2 Constant charge of +3
3 Small charge radius ratio
4 All of these
CHXII08:THE D- & F-BLOCK ELEMENTS

321731 Assertion :
\(\mathrm{Ce}^{4+}\) is used as an oxidising agent in volumetric analysis.
Reason :
\(\mathrm{Ce}^{4+}\) has the tendeney of attaining+3 oxidation state.

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.
CHXII08:THE D- & F-BLOCK ELEMENTS

321732 General characteristics of lanthanoids
I. These are silvery white soft metals.
II. They tarnish rapidly in air.
III. The hardness decreases with increasing atomic number, Samarium being steel hard.
IV. Their melting points range betwen 1000 to \(\mathrm{1200 \mathrm{~K}}\) but samarium melts at \(\mathrm{1623 \mathrm{~K}}\).
Identify the incorrect statement (choose the appropriate option)

1 I
2 II
3 III
4 IV
CHXII08:THE D- & F-BLOCK ELEMENTS

321733 Identify the incorrect statement with reference to \(\mathrm{\mathrm{Ce}(\mathrm{Z}=58)}\).

1 \(\mathrm{C e^{4+}}\) is a reducing agent.
2 Ce in +3 oxidation state is more stable than in +4 .
3 Atomic size of \(\mathrm{\mathrm{Ce}}\) is more than that of \(\mathrm{\mathrm{Lu}}\).
4 Ce shows common oxidation states of +3 and +4
KCET - 2019
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CHXII08:THE D- & F-BLOCK ELEMENTS

321730 What factor make the separation of Lanthanoids a formidable task?

1 Similarity in ionic size
2 Constant charge of +3
3 Small charge radius ratio
4 All of these
CHXII08:THE D- & F-BLOCK ELEMENTS

321731 Assertion :
\(\mathrm{Ce}^{4+}\) is used as an oxidising agent in volumetric analysis.
Reason :
\(\mathrm{Ce}^{4+}\) has the tendeney of attaining+3 oxidation state.

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.
CHXII08:THE D- & F-BLOCK ELEMENTS

321732 General characteristics of lanthanoids
I. These are silvery white soft metals.
II. They tarnish rapidly in air.
III. The hardness decreases with increasing atomic number, Samarium being steel hard.
IV. Their melting points range betwen 1000 to \(\mathrm{1200 \mathrm{~K}}\) but samarium melts at \(\mathrm{1623 \mathrm{~K}}\).
Identify the incorrect statement (choose the appropriate option)

1 I
2 II
3 III
4 IV
CHXII08:THE D- & F-BLOCK ELEMENTS

321733 Identify the incorrect statement with reference to \(\mathrm{\mathrm{Ce}(\mathrm{Z}=58)}\).

1 \(\mathrm{C e^{4+}}\) is a reducing agent.
2 Ce in +3 oxidation state is more stable than in +4 .
3 Atomic size of \(\mathrm{\mathrm{Ce}}\) is more than that of \(\mathrm{\mathrm{Lu}}\).
4 Ce shows common oxidation states of +3 and +4
KCET - 2019
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CHXII08:THE D- & F-BLOCK ELEMENTS

321730 What factor make the separation of Lanthanoids a formidable task?

1 Similarity in ionic size
2 Constant charge of +3
3 Small charge radius ratio
4 All of these
CHXII08:THE D- & F-BLOCK ELEMENTS

321731 Assertion :
\(\mathrm{Ce}^{4+}\) is used as an oxidising agent in volumetric analysis.
Reason :
\(\mathrm{Ce}^{4+}\) has the tendeney of attaining+3 oxidation state.

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.
CHXII08:THE D- & F-BLOCK ELEMENTS

321732 General characteristics of lanthanoids
I. These are silvery white soft metals.
II. They tarnish rapidly in air.
III. The hardness decreases with increasing atomic number, Samarium being steel hard.
IV. Their melting points range betwen 1000 to \(\mathrm{1200 \mathrm{~K}}\) but samarium melts at \(\mathrm{1623 \mathrm{~K}}\).
Identify the incorrect statement (choose the appropriate option)

1 I
2 II
3 III
4 IV
CHXII08:THE D- & F-BLOCK ELEMENTS

321733 Identify the incorrect statement with reference to \(\mathrm{\mathrm{Ce}(\mathrm{Z}=58)}\).

1 \(\mathrm{C e^{4+}}\) is a reducing agent.
2 Ce in +3 oxidation state is more stable than in +4 .
3 Atomic size of \(\mathrm{\mathrm{Ce}}\) is more than that of \(\mathrm{\mathrm{Lu}}\).
4 Ce shows common oxidation states of +3 and +4
KCET - 2019
NEET DIGITAL LIBRARY
CHXII08:THE D- & F-BLOCK ELEMENTS

321730 What factor make the separation of Lanthanoids a formidable task?

1 Similarity in ionic size
2 Constant charge of +3
3 Small charge radius ratio
4 All of these
CHXII08:THE D- & F-BLOCK ELEMENTS

321731 Assertion :
\(\mathrm{Ce}^{4+}\) is used as an oxidising agent in volumetric analysis.
Reason :
\(\mathrm{Ce}^{4+}\) has the tendeney of attaining+3 oxidation state.

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.
CHXII08:THE D- & F-BLOCK ELEMENTS

321732 General characteristics of lanthanoids
I. These are silvery white soft metals.
II. They tarnish rapidly in air.
III. The hardness decreases with increasing atomic number, Samarium being steel hard.
IV. Their melting points range betwen 1000 to \(\mathrm{1200 \mathrm{~K}}\) but samarium melts at \(\mathrm{1623 \mathrm{~K}}\).
Identify the incorrect statement (choose the appropriate option)

1 I
2 II
3 III
4 IV
CHXII08:THE D- & F-BLOCK ELEMENTS

321733 Identify the incorrect statement with reference to \(\mathrm{\mathrm{Ce}(\mathrm{Z}=58)}\).

1 \(\mathrm{C e^{4+}}\) is a reducing agent.
2 Ce in +3 oxidation state is more stable than in +4 .
3 Atomic size of \(\mathrm{\mathrm{Ce}}\) is more than that of \(\mathrm{\mathrm{Lu}}\).
4 Ce shows common oxidation states of +3 and +4
KCET - 2019
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