AIEEE 2003 | d and f Block Elements Question 238 | Chemistry

The radius of La³⁺ (Atomic number of La = 57) is 1.06 Å. Which one of the following given values will be closest to the radius of Lu³⁺ (Atomic number of Lu = 71) ?

1.60 Å

1.40 Å

0.85 Å

1.60 Å

AIEEE 2002

MCQ (Single Correct Answer)

-1

How do we differentiate between Fe³⁺ and Cr³⁺ in group III?

by taking excess of NH₄OH solution

by increasing $$NH_4^+$$ ion concentration

by decreasing OH^- ion concentration

both (b) and (c)

AIEEE 2002

MCQ (Single Correct Answer)

-1

Most common oxidation states of Ce (cerium) are :

+3, +4

+2, +3

+2, +4

+3, +5

AIEEE 2002

MCQ (Single Correct Answer)

-1

When KMnO₄ acts as an oxidising agent and ultimately forms [MnO₄]^-2, MnO₂, Mn₂O₃, Mn⁺² then the number of electrons transferred in each case respectively is :

4, 3, 1, 5

1, 5, 3, 7

1, 3, 4, 5

3, 5, 7, 1

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