Reactivity of transition elements decreases almost regularly from $S c$ to $C u$ because of:

lanthanoid contraction

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regular increase in ionisation enthalpy

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regular decrease in ionisation enthalpy

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increase in number of oxidation states

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Solution

The correct option is B regular increase in ionisation enthalpy
$R e a c t i v i t y α \frac{1}{I . E}$
Since Ionisation enthalpy increases from $S c$ to $C u$ , reactivity decreases from $S c$ to $C u$ .

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Similar questions

Explain the following
(i) Electronegativity of elements increase on moving from left to right in the periodic table.

(ii) Ionisation enthalpy decreases in a group from top to bottom.

T i

C u

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