Which one of the following characteristics of the transition metals is associated with their catalytic activity
A transition element X has a configuration
Which of the following has the maximum number of unpaired d-electrons
Mercury is the only metal which is liquid at
The aqueous solution containing which one of the following ions will be colourless
The lanthanide conctraction is responsible for the fact that
Which of the following ionic species will impart colour to an aqueous solution
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