d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 218

Question 1086

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In the catalyzed reaction between iodide and persulphate ions, what is the overall effect of the iron catalyst?

It is consumed and decreases the reaction rate
It changes the products formed
It is regenerated and increases the reaction rate
It acts as a spectator ion

Question 1087

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What is the main reason transition metal ions are effective catalysts in redox reactions?

Their large ionic radii
Their inability to form complexes
Their fixed +2 oxidation state
Their ability to easily change oxidation states

Question 1088

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Which process uses nickel as a catalyst for the hydrogenation of unsaturated compounds?

Contact Process
Haber's Process
Catalytic Hydrogenation
Oxidation Process

Question 1089

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What is the general effect of alloying pure metals like iron to form steels?

It decreases hardness and melting point
It has no effect on physical properties
It often increases hardness and melting point
It makes them more chemically reactive

Question 1090

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Why are transition metals particularly prone to forming alloys with each other?

They are all liquids at room temperature
They have very low melting points
They are highly reactive with oxygen
Their similar atomic radii and other characteristics