AIEEE 2003 | d and f Block Elements Question 211 | Chemistry

The atomic numbers of vanadium (V), Chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23, 24, 25 and 26. Which one of these may be expected to have the highest second ionization enthalpy?

AIEEE 2003

MCQ (Single Correct Answer)

-1

What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?

$$Cr_2O^{2-}_7$$ and H₂O are formed

$$CrO^{2-}_4$$ is reduced to +3 state of Cr

$$CrO^{2-}_4$$ is oxidized to +7 state of Cr

Cr³⁺ and $$Cr_2O^{2-}_7$$ are formed

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

AIEEE 2002

MCQ (Single Correct Answer)

-1

Most common oxidation states of Ce (cerium) are :

+3, +4

+2, +3

+2, +4

+3, +5