AP EAMCET Engineering 2018 Apr 24 Shift 1 Paper

i. Oxygen shows -2,-1,+1,+2 oxidation states.
ii. As we move from top to bottom in a group, the atomic radius increases, thus, the potential to form stable covalent bond with hydrogen goes on decreasing. Therefore, the correct order is:
H2O> H2S>H2Te
iii. Lesser the thermal stability of hydrides, the greater is reducing character, Therefore, the correct order is:
H2S<H2Se<H2Te
Hence, statements (i) and (iii) are correct.