Statement – I: Mischmetal contains 5% lanthanide and 95% Fe Statement – II: Electronic configuration of Ce is [Xe] <math xmlns="http://www.w3.org/1998/Math/MathML"><mn>4</mn><msup><mi>f</mi><mn>2</mn></msup><mn>6</mn><msup><mi>s</mi><mn>2</mn></msup></math> Statement – III: <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>E</mi><msup><mi>u</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></math> is a strong reducing agent Statement – IV: <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>C</mi><msup><mi>e</mi><mrow><mn>4</mn><mo>+</mo></mrow></msup></math> is a strong oxidizing agent Correct statements are

Statement – I: Mischmetal contains 5% lanthanide and 95% Fe Statement – II: Electronic configuration of Ce is [Xe] Statement – III: is a strong reducing agent Statement – IV: is a strong oxidizing agent Correct statements are

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Solution

Q.
Statement – I: Mischmetal contains 5% lanthanide and 95% Fe

Statement – II: Electronic configuration of Ce is [Xe] $4 f^{2} 6 s^{2}$

Statement – III: $E u^{2 +}$ is a strong reducing agent

Statement – IV: $C e^{4 +}$ is a strong oxidizing agent

Correct statements are

Solution

Q.
Statement – I: Mischmetal contains 5% lanthanide and 95% Fe

Statement – II: Electronic configuration of Ce is [Xe] $4 f^{2} 6 s^{2}$

Statement – III: $E u^{2 +}$ is a strong reducing agent

Statement – IV: $C e^{4 +}$ is a strong oxidizing agent

Correct statements are

1 I, II only

2 I, II, III only

3 I, II, III, IV

4 III, IV only

Ans.
(4)

III and IV are correct

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Solution

Q. Statement – I: Mischmetal contains 5% lanthanide and 95% Fe Statement – II: Electronic configuration of Ce is [Xe] 4f26s2 Statement – III: Eu2+ is a strong reducing agent Statement – IV: Ce4+ is a strong oxidizing agent Correct statements are

1 I, II only

2 I, II, III only

3 I, II, III, IV

4 III, IV only

Ans. (4) III and IV are correct

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Q.
Statement – I: Mischmetal contains 5% lanthanide and 95% Fe

Statement – II: Electronic configuration of Ce is [Xe] $4 f^{2} 6 s^{2}$

Statement – III: $E u^{2 +}$ is a strong reducing agent

Statement – IV: $C e^{4 +}$ is a strong oxidizing agent

Correct statements are

Ans.
(4)

III and IV are correct