d and f Block Elements

Which of the following exhibits only + 3 oxidation state?

For the four successive transition elements (Cr, Mn, Fe and Co), the stability of + 2 oxidation state will be there in which of the following order?
(At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of

Which of the following ions will exhibit colour in aqueous solutions?

Which of the following pairs has the same size?

Which of the following ions has electronic configuration [Ar]3d6?
(At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)

Which of the following oxidation states is the most common among the lanthanoids?

Match List I (substances) with List II (processes) employed in the manufacture of the substances and select the correct option.

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Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?

The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is

Identify the incorrect statement among the following:

Which one of the following ions is the most stable in aqueous solution?
(At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)

In which of the following pairs are both the ions coloured in aqueous solution?
(At. no. : Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is

Copper sulphate dissolves in excess of KCN to give

The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is

More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is

The aqueous solution containing which one of the following ions will be colourless?
(Atomic number : Sc = 21, Fe = 26, Ti = 22, Mn = 25)

Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?

Among the following series of transition metal ions, the one where all metal ions have 3d2 electronic configuration is
[At. Nos. Ti = 22, V = 23, Cr = 24, Mn = 25]

lanthanoids are

The correct order of ionic radii of Y3+, La3+, Eu3+ and Lu3+ is
(Atomic nos. Y = 39, La = 57, Eu = 63, Lu = 71)

Which one of the following characteristics of the transition metals is associated with their catalytic activity?

The basic character of the transition metal monoxides follows the order
(Atomic no's. Ti = 22, V = 23, Cr = 24, Fe = 26)

General electronic configuration of lanthanides is

An atom has electronic configuration 1s2 2s2 2p6 3s2 3p6 3d3 4s2, you will place it in

Which of the following shows maximum number of oxidation states?

Zn gives H2 gas with H2SO4 and HCl but not with HNO3 because

The most convenient method to protect the botton of ship made of iron is

Which of the following statement is not correct?

Which of the following shows maximum number of oxidation states?

Which ion is colourless?