d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 66

Question 326

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How does the reactivity of actinoids with boiling water demonstrate a specific chemical property?

It shows they are unaffected by heat.
It demonstrates their ability to reduce water.
It proves they are noble metals.
It indicates low reactivity.

Question 327

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What does the text imply about the general trend of properties in the early actinoid series?

Properties change erratically.
Properties are identical.
Properties change gradually and elements are similar to each other.
Properties depend only on atomic number.

Question 328

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Why is the availability of outer electrons important for the reactivity of actinoids?

Less available electrons increase reactivity.
It determines the melting point.
More available electrons lead to easier participation in chemical reactions.
It only affects physical properties.

Question 329

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What is the main implication of the text regarding the shielding effect of 5f versus 4f electrons?

4f electrons shield outer electrons better than 5f electrons.
5f electrons shield outer electrons better than 4f electrons.
Both shield equally well.
Shielding is not affected by orbital type.

Question 330

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How does the text describe the general chemical nature of actinoid metals?

They are generally unreactive.
They are moderately reactive under all conditions.
They are highly reactive, especially in finely divided form.
They are only reactive with oxygen.