51) Which of the gases in the graph below has the largest molar mass at constant

Question

51) Which of the gases in the graph below has the largest molar mass at constant temperature? S1)_ 500 1000 1500 2000 2500 Molecular Speed A) A B) B D) D E) There is not enough information to determine. molar 52) 52) Determine the freezing point depression of a solution that contains 30.7 g glycerin (C mass 92.09 g/mol) in 376 ml. of water. Some possibly useful constants for water are Kf-1.86°Cm and Kb = 0.512-Crt. ankel E) 0.887°C B) 4.98°C 0.654 C D)3.33 C A) 1.65°C 53) 53) In a liquid, the energy required to increase the surface of the area by a unit amount is called A) surface tension. B) viscosity. C) capillary action. D) hydrogen bonding. E) dipole-dipole force. 54) 54) Give the term for the amount of solute in moles per liter of solution. A) mole percent B) molality mass percent D) molarity E) mole fraction r 55) 55) A molecule, that is sp3'd2 hybridized and has a molecular geometry of square planar, has --lone pairs around its central atom. C)4,1 bonding groups and E)2,3 A) 5, 1 B) 4, 2 D) 3,2

Explanation / Answer

51)

From the graph the answer is D

Since the molecular speed is inversely proportional to the molecular of the compound.so most of D molecules are very low molecular speed so it has high molecular mass.

Answer : D

52)

Depression in freezing point = kf * molality of the solution

dT = kf * maas of solute/molar mass of solute * 1000/mass of solvent in g

dT = 1.86 * 30.7/92.09 * 1000/376 ( since density of water d = 1g/mL)

dT = 1.6491

dT = 1.65 0C

Answer : A

53)

Surface tension

Answer : A

54)

Number of moles of solute present in the given volume of solution is concentration term named as molarity

Answer : D

55)

From the given data sp3d2 hybridisation and consist of square planar structure indicating there are only four bonds are present. so only four hybrid orbitals are required and the remaining hybrid orbitals are occupied by lone pair of electrons.

so number of bond pairs are = 4

number of lone pairs are = 2 the only we will get square planar geometry.

Answer : B

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