d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 73

Question 361

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Why are the magnetic properties of actinoids described as more complex than those of lanthanoids?

Actinoids have more unpaired electrons.
Actinoids are radioactive.
The involvement and behavior of 5f electrons are more complex.
Lanthanoids have no magnetic properties.

Question 362

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How do actinoid metals behave when exposed to alkalies (strong bases)?

They react vigorously to produce hydrogen.
They dissolve completely.
They show no reaction.
They form complex salts.

Question 363

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What explains the difference in reactivity between hydrochloric acid and nitric acid towards actinoid metals?

HCl is a weaker acid.
HNO3 is a weaker acid.
Nitric acid causes formation of protective oxide layers.
Actinoids dissolve completely in both.

Question 364

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Why does boiling water react with actinoid metals to form a mixture of oxide and hydride?

Because water is a strong acid.
Because actinoids are non-metals.
It demonstrates their high chemical reactivity.
Because they are noble metals.

Question 365

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What is the primary reason actinoids are considered highly reactive metals?

Due to their large atomic size.
Due to their low melting points.
Due to less firmly held outer electrons.
Due to their high electronegativity.