Q51 Note of 70 Page 111

Reactivity of transition elements decreases almost regularly from Sc to Cu. Explain.

When we move along a period from left to right, there is an increase in effective nuclear charge and the size reduces. The electrons are held more tightly and ionization enthalpy increases because removing the outermost electron becomes difficult. Therefore, reactivity also decreases. Sc is more reactive than Cu.


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Match the catalysts given in Column I with the processes given in Column II.

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Match the compounds/elements given in Column I with uses given in Column II.