AIEEE 2009 | d and f Block Elements Question 195 | Chemistry

Amount of oxalic acid present in a solution can be determined by its titration with $$KMn{O_4}$$ solution in the presence of $${H_2}S{O_4}.$$ The titration gives unsatisfactory result when carried out in the presence of $$HCl,$$ because $$HCl$$ :

gets oxidised by oxalic acid to chlorine

furnishes $${H^ + }$$ ions in addition to those from oxalic acid

reduces permanganate to $$M{n^{2 + }}$$

oxaidises oxalic acid to carbon doxide and water

AIEEE 2008

MCQ (Single Correct Answer)

-1

Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being :

4f orbitals more diffused than the 5f orbitals

lesser energy difference between 5f and 6d than between 4f and 5d orbitals

more energy difference between 5f and 6d than between 4f and 5d orbitals

more reactive nature of the actinoids than the lanthanoids

AIEEE 2007

MCQ (Single Correct Answer)

-1

The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because :

the 5f orbitals are more buried than the 4f orbitals

there is a similarity between 4f and 5f orbitals in their angular part of the wave function

the actinoids are more reactive than the lanthanoids

the 5f orbitals extend further from the nucleus than the 4f orbitals

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