The correct statement(s) about interstitial compounds is/are:

1.	Transition elements are large in size and contain multiple interstitial sites.
2.	Transition elements can trap atoms of other elements.
3.	Interstitial compounds are chemically inert.
4.	All of the above.

Match the following:

The correct statement(s) about transition elements are:  

The most common oxidation state for lanthanoids and actinoids is:

1. +5

2. -3

3. +1

4. +3

The correct statement(s) regarding the oxidation state of transition elements is/are:

The reaction(s) involved in the preparation of potassium dichromate from iron chromite ore is/are:

For M²⁺/M, and M³⁺/M²⁺, the $\mathrm{E}°$ values of some metals are given in the table below:

The correct inference(s) from the above data is/are: 

Consider the following graph.

Based on the graph above, it can be concluded that the element with a melting point higher than 3000 K will be:

Transition metals show paramagnetic behaviour due to:

Transition metals and their many compounds act as good catalysts due to :