1. Which one of the following molecules would be most polar? a-H2 b-HI C-HF d-HC
ID: 704652 • Letter: 1
Question
1. Which one of the following molecules would be most polar? a-H2 b-HI C-HF d-HCI e-HBr 2) The weakest interparticle attractions exist between particles of a and the strongest interparticle attractions exist between particles of a a. liquid, gas b. gas, liquid c. liquid, solid d. solid, gas e. gas, solid 3-Based on intermolecular interactions, which of the following should have the highest boiling poin a-CH4 b-CHC13 c-H2S d-CH3OH 4-Which one of the following statements is incorrect a- Dispersion (London) forces are the weakest type of intermolecular interactions. b- The strong intermolecular attractions in H20 result from hydrogen bonding. c- The boiling point of H2S is lower than H20. d-The boiling point of non-polar substances tends to decrease with increasing molecular weigh 5-Which of the following shows a hydrogen bonding interaction? a-NH3 b-CH4 c-BH3 d-SiH4 e-GeH4 6-Methanol, CH3OH (bp: 65oC), boils nearly 230o higher than methane, CH4 (bp: -1640C). What intermolecular forces are responsible for the higher boiling point of methanol? a- dispersion forces b-hydrogen bonds c- induced dipole-induced dipole d-ion-dipole 7-if Celsius to Kelvin K C+ 273 a-21°c a- 294 K b-252k c-298 d-11.66 e-37.8Explanation / Answer
Ans 1
Higher the difference in electronegativity between the elements of the molecule, higher will be the polarity
H2 is H--H both elements are hydrogen so it would be the least polar.
F is the most electronegative than Cl, Br and I
HF is the most polar.
Polarity in decreasing order
HF > HCl > HBr > HI > H2
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