The formulas and boiling points of three compounds are given in the table: The t

Question

The formulas and boiling points of three compounds are given in the table: The trend in boiling points is best attributed to: covalent bonding. dipole forces. hydrogen bonding. Which statement about the triple point of a substance is correct? The triple point for a substance varies with the pressure. The three phases (solid, liquid, gas) have the same density. The three phases (solid, liquid, gas) are in equilibrium. are indistinguishable in appearance. BF3 is no polar molecule. What is its geometry? seesaw T-shaped trigonal planar trigonal pyramidal Pure samples of which of the following exhibit hydrogen bonding? CH_3OH CH_3NO_2 CH_3CN I only I and II only II and III only I, II and III What is the molality of a solution made by dissolving 36.0 g of glucose (C_6H_12O_6, M = 1802) in 640 g of H_2O? 0.0533 0.200 0.360 3.12 Which aqueous solution freezes at the lowest temperature? 0.30 m C_2H_5OH 0.25 m KNO_3 0.20 m CaBr_2 0.10 m FeCI_3 Barium metal crystallizes in a body-centered cubic lattice with barium atoms only at the lattice points. IF the density of barium metal is 3.50 g/cm^3, what is the length of the unit cell? 3.19 times 106-8 cm 4.02 times 10^-8 cm 5.04 times 10^-8 cm 6.39 times 10^-8 cm Which of the following compounds has the lowest boiling point? HF HCI HBr HI Boron trifluoride, BF_3, is a non-polar molecule. What is its geometry? seesaw T-shaped trigonal planar trigonal pyramidal Which statement about atoms arranged in a body centered cubic (bcc) crystal structure is correct? It is not observed as the structure of any metal. It is also called the cubic closest-packed (ccp). The unit cell contains two atoms. Each atom has 6 nearest neighbors.

Explanation / Answer

27) Answer: (B)

Explanation:

Aldehydes are having the Dipolr force than Ethers and Alkanes.

28) Answer: (C)

Triple point is having the three phases are in equilibrium.

29) Answer: (D)

Explanation: BF3-

Central atom B is having 3 sigma bonds and 1 lone pair. Hence it is the Trigonal pyramidal.

30) Answer: (A)

Explanation:

Hydrogen bond is attractive force between Hydrogen which is attached to the electronegativity atom and other electronegativity atom.

The atomic radii of Hydrogen and the electronegativity atom nearly same.

31) Answer: (D)

solute is the Glucose and the solvent is the water

molality = (solute weight/ solute molecular weight) x (1000/ solvent weight in grams)

m = (36 / 180.2) x (1000/64)

m = 3.121

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