ircle one best answer for each multiple choice. (4 PlLCll) Which is nonelectroly
ID: 555706 • Letter: I
Question
ircle one best answer for each multiple choice. (4 PlLCll) Which is nonelectrolyte? a) CH,OH, b) CH COOH, c) NHs, d) KI. Aqueous HCl solution contains the following solute(s): a) HCl; b) H; c)H, C; d) HCI, H', CI Oxidation number of C in H2CO, is a) +4, b) 0, c) -2, d)-4 Ideal gas has a) no mass, b) no volume, c) no pressure, d) no energy. Which gas effuses fastest? a) N20s, b) N20s, c) NO2, d) N204 For an endothermic reaction, the total enthalpy of reactantsis the total enthalpy of products. a) equal to, b) less than, c) greater than, d) none of the above. Identify each of the following as acid, base, salt, or none of the above. [15 pt] NHs, KNO3, CH4, C12H2011, HBrExplanation / Answer
1) C2H5OH is a non-electrolyte as it is neither an acid nor a base.
2) The correct answer should be part c) H+, Cl- as HCl is a strong acid. It will dissociate completely into ions when dissolved in water. Water will be solvent and the ions of HCl will be the solute.
3) The oxidation number of C in H2CO3 is a) +4 as
2 + x + 3(-2) = 0
=> x - 4 = 0
=> x = +4
4) Ideal gas has no volume, or better to say negligible volume because ideal gas has negligible intermolecular interactions. The size of the particles is so small that the volume occupied by the particles can be neglected in comparison to the size of the container in which the gas is kept.
5) NO2 will effuse the fastest as according to the Graham's law of effusion, the rate of effusion of any gas is inversely proportional to the square root of its molar mass.
6) For an endothermic reaction, the total enthalpy of reactants is less than the total enthalpy of products.
This is because, in e dothermic reaction, energy is being absorbed by the reactants.
7) Acid: HBr (as it gives away a proton H+ when dissolved in water)
Base: NH3 (as it accepts a proton when dissolved in water)
Salt: KNO3 and C12H22O11
None of the above (neutral) : CH4
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