Quick questions on Transition elements, variable oxidation states and catalysis: Singapore A-Level H2 Chemistry

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is defining a transition element?

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A transition element is a

d

-block element that forms at least one stable ion with a partially filled

d

subshell. Two

d

-block elements fail this test:

What is q1?

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Write the electronic configurations of

\text{Mn}^{2+}

and

\text{Cr}^{3+}

. [2 marks]

What is q2?

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Explain why transition elements can show several oxidation states. [2 marks]

What is q3?

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Name the catalyst and state its type (homogeneous or heterogeneous) for (a) the Contact process and (b) the

\text{S}_2\text{O}_8^{2-}

\text{I}^-

reaction. [2 marks]

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