AIEEE 2011 | d and f Block Elements Question 174 | Chemistry

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AIEEE 2011

MCQ (Single Correct Answer)

-1

In context of the lanthanoids, which of the following statements is not correct?

All the members exhibit +3 oxidation state

Because of similar properties the separation of lanthanoids is not easy.

Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series.

There is a gradual decrease in the radii of the members with increasing atomic number in the series.

AIEEE 2009

MCQ (Single Correct Answer)

-1

Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?

Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character.

The ionic sizes of Ln (III) decrease in general with increasing atomic number.

Ln (III) compounds are generally colourless

Ln (III) hydroxides are mainly basic in character.

AIEEE 2009

MCQ (Single Correct Answer)

-1

In context with the transition elements, which of the following statements is incorrect ?

In addition to the normal oxidation states, the zero oxidation state is also shown by these elements in complexes.

In the highest oxidation states, the transition metal show basic character and form cationic complexes.

In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d electrons are used for bonding

Once the d⁵ configuration is exceeded, the tendency to involve all the 3d electrons in bonding decreases.

AIEEE 2008

MCQ (Single Correct Answer)

-1

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

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