Consider the phase diagram of pure compound. Which statement applies? (A) The pa

Question

Consider the phase diagram of pure compound. Which statement applies? (A) The path A rightarrow C represents sublimation. (B) Following the C the compound would first liquefy and then vaporize.(c) If the compound is in state A, continued reduction of pressure (at constant temperature) will cause it to melt. (D) None of these statements is correct A crystal anhydrous KNO_3 is made up of (A) molecules of KNO_3 (B) atoms of potassium, and 3 atoms of oxygen alternately spaced in the crystal. (C) a geometrical pattern of potassium ions and nitrate ions in the crystal. (D) potassium nitrate molecules alternately spaced with water molecules. (E) molecules of KNO, and water combined into larger molecules. which group of substances is correctly arranged in order from the highest to the lowest melting point? Also state the primary intermolecular forces for each compound (A) HF rightarrow H_2 rightarrow NaF (B) NaF rightarrow H_2 rightarrow HF (C) HF rigthtarrow NaF rightarrow H_2 (D) NaF rightarrow HF rightarrow H_2 Primary forces of each: Primary intermolecular forces for each: which has the highest molar heat of vaporization? (A) a molecular liquid, S_8 (B) a hydrogen-bonded liquid. H_2O (C) a monatomic liquid, Ar (D) an ionic melt, BaF_2 which inert gas has the highest boiling 4.0 Explain why Draw the structures and determine the formal charge of each atom in (A) H_2O (B) NH_3

Explanation / Answer

Ans 24 C. If the compound is in state A , continued reduction of the pressure (at constant temperature) will cause it to melt.

In the phase diagram given in the question A is solid phase , B is vapour phase and C is liquid phase.

Reduction of pressure would increase the volume of compound as , the pressure is inversely related to volume , according to boyle's law.

So reduction in pressure would cause the molecules to move apart and hence melt .

The further decrease in pressure would gassify the substance .

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