Trends in Physical and Chemical Properties — Prelims Questions

Which of the following statements about the trends in properties of Group 17 elements is INCORRECT?

Which of the following halogens exists as a liquid at room temperature ($25^circ C$)?

Which of the following reactions will NOT occur?

Which of the following halogens can exhibit a +7 oxidation state?

Arrange the hydrogen halides (HF, HCl, HBr, HI) in increasing order of their thermal stability.

Which of the following statements correctly describes the trend in colour of halogens down the group?