d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 247

Question 1231

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Why is the +3 oxidation state relatively unstable for Iron (Fe) in aqueous solution compared to +2?

Fe3+ has a larger ionic radius than Fe2+
Fe3+ is more hydrated than Fe2+
Fe3+ is less soluble than Fe2+
The high third ionisation energy required to form Fe3+ from Fe2+

Question 1232

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Which of the following statements correctly describes the relationship between E° values and the oxidising/reducing nature of metal ions?

A low negative E°(M3+/M2+) indicates a strong oxidising agent (M3+)
A high positive E°(M2+/M) indicates a strong reducing agent (M)
A low negative E°(M2+/M) indicates a strong oxidising agent (M2+)
A high positive E°(M3+/M2+) indicates a strong oxidising agent (M3+)

Question 1233

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Why is the E°(M2+/M) value for Vanadium (V) more negative than expected from the simple trend?

The exceptional stability of the d3 configuration in V2+
Its high melting point
Its low atomic mass
The relatively low sum of the first and second ionisation enthalpies of V

Question 1234

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What is the primary factor that determines whether a first-row transition metal will react with 1M H+ ions?

The metal's melting point
The metal's density
The metal's position in the periodic table
The sign and magnitude of the metal's E°(M2+/M) value

Question 1235

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Why is the E°(M3+/M2+) value for Iron (Fe) less positive than that for Cobalt (Co)?

Fe3+ is smaller than Co3+
Fe3+ has a higher charge density
Fe2+ is more stable than Co2+
Fe3+ (d5) is less stable than Co3+ (d6) relative to their M2+ states