What are the products formed when moist chlorine gas is reacted with hypo $(Na_2S_2O_3)$?

Which reaction cannot be used for the production of halogen acid?

The correct order of acidic strength is:

Identify the incorrect statement among the following.

Identify the correct decreasing order of boiling point for hydrides of halogens.

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 $(E)$?