1. Among group 16 elements, which one does NOT show -2 oxidation state

(1).Te

(2). Po

(3). O

(4). Se

2. Which is NOT a redox reaction?

(1).\(\text{H}_2\,+\,\text{Cl}_2\,\rightarrow\,2\text{HCl}\)

(2). \(\text{BaCl}_2\,+\,\text{Na}_2\text{SO}_4\,\rightarrow\,\text{BaSO}_4\,+\,2\text{NaCl}\)

(3). \(\text{Zn}\,+\,\text{CuSO}_4\,\rightarrow\,\text{ZnSO}_4\,+\,\text{Cu}\)

(4). \(2\text{KClO}_3\,+\,\text{I}_2\,\rightarrow\,2\text{KIO}_3\,+\,\text{Cl}_2\)

3. Consider the following compounds:
\(\text{K0}_2\), \(\text{H}_2\text{0}_2 and \(\text{H}_2\text{SO}_4
The oxidation states of the underlined elements in them are, respectively,

(1).+4, -4, and +6

(2). +1, -1, and +6

(3). +2, -2, and +6

(4). +1, -2, and +4