Most transition metals
$I :$ form sets of compounds which display different oxidation states of the metal
$II :$ form coloured ions in solution
$III :$ burn vigorously in oxygen
$IV :$ act as catalyst
$I, II, III$ are correct
$II, III, IV$ are correct
$I, II, IV$ are correct
all are correct
Mark the variety of iron which has highest melting point
Melting point of $FeCl_3$ and $FeCl_2$ is
Solid $CuSO_4·5H_2O$ having covalent, ionic as well as co-ordinate bonds. Copper atom/ion forms ................. co-ordinate bonds with water.
Metre scales are made-up of alloy
Which of the following pair both compounds have no exsistance