Which of the following statements is INCORRECT? The solubility of a gas in water

Question

Which of the following statements is INCORRECT? The solubility of a gas in water decreases with increasing temperature. The solubility of a gas in water is proportional to the partial pressure of the gas above the water. The dissolution of a gas in water is usually an exothermic process. The relationship between the solubility of a gas and its partial pressure is known as Henry's law. The solubility of a gas in water is inversely proportional to the molar mass of the gas. Which of the following liquids will be miscible with water in any proportion: ethanol (CH_3 CH_2 OH), carbon tetrachloride (CCl_4), hexane (C_6 H_14), and/or formic acid (HCO_2 H)? ethanol and carbon tetrachloride carbon tetrachloride and hexane ethanol and formic acid ethanol, carbon tetrachloride, and benzene carbon tetrachloride, and formic acid

Explanation / Answer

28) Ans = e

  e = No such realation is known

The statements a-d are correct.

There is no relation between solubility of gas in water and molar mass of the gas.

29) Ans = c - ethanol and formic acid

Ethanol and Formic acid are miscible with water in any proportion because they form hydrogen bonding with water.

Hydrogen bonding is an electrostatic attraction between hydrogen atom which is attached highly electronegative atom like F,N,O of one molecule and nearby highly electronegative atom of another molecule.

Ex: H-O--H , F-H---F, N-H---N

The hydrogen atom attached to oxygen of ethanol molecule forms hydrogen bonding with oxygen atom of water.

The hydrogen atom attached to oxygen of formic acid molecule forms hydrogen bonding with oxygen atom of water.

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