The atomic radius of $Ag$ is closest to
$Cu$
$Hg$
$Au$
$Ni$
Which of the following ions is coloured
When $KMnO_4$ solution is added to hot oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time. This is because
Which of the following is diamagnetic transitional metal ion
Which of the following pair will have effective magnetic moment equal