What is formed when $KI$ is heated with concentrated $H_2SO_4$?

Which of the following is a good reducing agent?

Which one of the following halogens liberates oxygen when passed through hot concentrated $KOH$ solution?

What are the products formed when fluorine reacts with dilute $NaOH$ and concentrated $NaOH$,respectively?

Iodine can exhibit which of the following oxidation states?

Consider the following reactions:
$(A) (\text{Ionic halide}) + (B) (\text{Good oxidising agent}) + \text{conc. } H_2SO_4 \to (C) (\text{Red-Orange gas is evolved with few by-products})$
$(D) (\text{Other ionic halide}) + (B) + \text{conc. } H_2SO_4 \to (E) (\text{Has same colour as } (C))$
Which of the following properties are different for $(C)$ and $(E)$?