The nature of oxide (TeO₂) and hydride (TeH₂) formed by Te , respectively are :

Solution

Chemistry ma’am · 3 steps

Go down group 16: the dioxides lose reducing power and the hydrides gain acidic strength.

1. The dioxide. In EO₂ the element is in the +4 state. Going down the group, the +4 state becomes more stable and the +6 state less stable. So SO₂ is a reducing agent, but TeO₂ acts as an oxidising agent.
2. The hydride. Acidic character of the hydrides goes H₂O < H₂S < H₂Se < H₂Te. The Te atom is large, so the H–Te bond is long and weak, and H₂Te gives up H⁺ most easily. It is the most acidic hydride of the family.

   Element	Dioxide behaves as	Hydride is
   S	SO₂: reducing	H₂S: weakly acidic
   Se	SeO₂: oxidising	H₂Se: more acidic
   Te	TeO₂: oxidising	H₂Te: most acidic

3. So. TeO₂ is oxidising and H₂Te is acidic, which is option (c).

The idea to keep. Down group 16, the +4 state gets more stable, so the dioxides turn from reducing to oxidising. The E–H bond gets weaker, so the hydrides get more acidic.

Answer from the NTA final answer key. Solution by PrepWiser.