Choose the response that lists the member of each of the following pairs that ha

Question

Choose the response that lists the member of each of the following pairs that has the higher boiling point. H_2O or KI (II) HF or HI (III) CI_2 or Br_2 A) H_2O, HF, and CI_2 B) KI, HF, and Br_2 C) KI, HI, and Br_2 D) H_2O, HI, and CI_2 E) KI, HF, and CI_2 Which one of the following substances should exhibit hydrogen bonding in the liquid state? A) PH_3 B) He C) H_2S D) CH_4 E) CH_3OH Which of the following is not true with regard to water? A) Water has a high heat capacity. B) Water has an unusually high boiling point. C) Water can form hydrogen bonds. D) Ice is more dense than liquid water. E) Water is a polar molecule. Which one of the following is an example of a covalent network solid? A) SiO_2 B) K C) I_2 D) CaCI_2 E) None of these. A liquid boils when its A) vapor pressure is exactly 1 atmosphere. B) vapor pressure is equal to, or greater than, the external pressure pushing on it. C) temperature is equal to 273 K (standard temperature). D) temperature is greater than room temperature. The heat capacity of liquid water is 4.18 J/g degree C and the heat of vaporization is 40.7 kJ/mol. How many kilojoules of heat must be provided to convert 1.00 g of liquid water at 67 degree C into 1.00 g of steam at 100 degree C? A) 22.7 kJ B) 40.8 kJ C) 2.2 kJ D) 2, 400 J E) 40.8 J

Explanation / Answer

Ans 9. B) KI, HF and Br2

KI is an ionic solid , hence it has higher boiling point than water.

HF has higher boiling point than HI , due to the presence of hydrogen bonding.

Though Br2 and Cl2 both are halogens , Br2 is larger in size , hence it has higher boiling point .

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