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2 simple chemistry questions?

Please help me with these chemistry questions..?

  1. Which one of the following substances would you expect to have the lowest boiling point? A- CsCl

B- SrSo4 C- Sc2O3 D-AsCl3

2.

Which one of the following would not conduct an electric current? A-solid sodium chloride B- Liquid Sodium Chloride C- Aqueous Sodium chloride D-Solid Mercury

3.which of the following substances would you expect to be the most soluble in water?

a- CH3-CH2-CH2-CH2-CH2-CH3

b-H2N-CH2-CH2-CH2-CH2-NH2

c-Cl-CH2-CH2-CH2-CH2--Cl

d-CH3-CH2-CH2-OCH2-CH2-CH3

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