Which of the following has the lowest boiling point, based on structure, polarit

Question

Which of the following has the lowest boiling point, based on structure, polarity, molar mass and bonding? Methane carbon tetrafluoride carbon tetrachloride carbon tetrabromide carbon tetraiodide A detergent labeled "mild" has a pH of 7.80. What is the hydroxide ion concentration in this detergent ? 6.31 times 10^-7 M 1.6 times 10^-8 M 1.58 times 10^8 M 4.9 times 10^-7 M 6.3 times 10^-7 M A 25,000 mL sample of calcium hydroxide was titrated with 12.76 mL of 0.0199 M hydrochloric acid. What is the concentration of the base? 5.08 times 10^-2 M 1.02 times 10^-2 M 1.02 times 10^-3 M 6.88 times 10^-3 M 5.08 times 10^-3 M Which of the following orbital diagrams represent the valence electrons for oxygen? none of the above For the complete combustion of l-pentene (C_5H_20), how many liters of carbon dioxide gas will be formed by the reaction of 400 liters of oxygen when reacted with excess l - pentene? (Assume that the reaction is constant temperature and pressure.) 400 L 367 L 600 L 267 L 825 L Which has the highest melting point? Fluorine BH_3 Chlorine Potassium iodide

Explanation / Answer

9)
All of them are non polar.
Only dispersion forces acts
smaller the molar mass, smaller will be dispersion forced and hence smaller will be the boiling point
Answer: a

10)
pH = -log[H+]
7.80 = -log [H+]
[H+] = 1.58*10^-8 M

[OH-] = 10^-14 / [H+]
= 10^-14 / (1.58*10^-8)
= 6.31*10^-7 M

Answer: a

I am allowed to answer only 1 question at a time

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