The metals which can produce amphoteric oxides are:

74 An element X reacts with hydrogen, when heated, to form a covalent hydride H₂X. If H₂X has a smell of rotten eggs, the element X is likely to be: 75 Out of the following oxides, the amphoteric oxide is: 77 An element X forms two oxides XO and XO₂. The oxide XO is neutral but XO₂ is acidic in nature. The element X is most likely to be : 78 The elements whose oxides can turn litmus solution blue are: