Identify the correct decreasing order of atomic size from the following.

The aqueous solution containing which one of the following ions will be colourless?

Which of the following groups of transition metals is known as coinage metals?

Given below are two statements:
Statement-$I$: The first ionization enthalpy of $Cr$ is lower than that of $Mn$.
Statement-$II$: The second and third ionization enthalpies of $Cr$ are higher than those of $Mn$.
In the light of the above statements, choose the correct answer from the options given below:

What is the number of unpaired electrons in $Ti$ in $+3$ state?

The magnetic moment of a transition metal compound has been calculated to be $3.87 \ B.M.$ The metal ion is