The number of unpaired electrons in ferrous ion is
$5$
$4$
$3$
$2$
$(a)$ Transition metals can act as catalysts because these can change their oxidation state. How does $Fe(III)$ catalyse the reaction between iodide and persulphate ions ?
$(b)$ Mention any three processes where transition metals act as catalysts.
Which of the following is not correct
The metal that shows highest and maximum number of oxidation state is:
The highest magnetic moment is shown by the transition metal ion with the outer electronic configuration
Which of the following ions will exhibit colour in aqueous solutions?