Chemistry - 2013 E.C (2020/2021) Ethiopian University Entrance Exam (EUEE)

A The solubility of C₂H₆ in H₂O.

B The solubility of C₆H₆ in CCl₄.

C The insolubility of I₂ in H₂O.

D The solubility of KBr in C₇H₈.

A ppm (parts per million) = (mass of solute/ mass of solvent) x 10⁶

B mass percentage= mass of solute x 100

C mass percentage= mass of solute x 100

D ppb (parts per billion)= (mass of solute/mass of solution) x 10⁶

A Molarity 36.6 M, Normality 18.3 N, Mole fraction 0.1

B Molarity 18.3 M, Normality 36.6 N, Mole fraction 0.9

C Molarity 1.83 M, Normality 3.66 N, Mole fraction 0.9

D Molarity 18.3 M, Normality 3.66 N, Mole fraction 0.9

A By dissolving 74 g of Ca(OH)₂ in 500 mL of solution.

B By dissolving 37 g of Ca(OH)₂ in 1 liter of solution.

C By dissolving 37 g of Ca(OH)₂ in 500 mL of solution.

D By dissolving 74 g of Ca(OH)₂ in 1 liter of solution.

A 1.42

B 3.6

C 4.2

D 1.34

A m=^Mt/_nF

B n=^mlt/_MF

C m=^mt/_F

D M=^mlt/_nF

A At the anode H₂ is liberated, whereas copper is deposited at the cathode.

B At the anode the copper electrode dissolves and copper metal is deposited at the cathode.

C No electrochemical reaction takes place involving copper.

D At the anode copper is reduced, whereas copper is oxidized at the cathode.

A Raoult's law.

B Dalton's law.

C Henry's law.

D Faraday's law.

A K is the strongest reduction agent among the metal silver.

B Cu is the strongest reducing agent in the group.

C Pb is more easily oxidized than Al.

D The reaction Cu + Zn²⁺ ⇌ Cu²⁺ + Zn is spontaneous.

E Al is the most reactive metal in the series.

A It causes enormous damage to buildings, bridges, ships and cars.

B It causes deterioration of metals by spontaneous chemical process.

C Corrosion forms protection oxide layers to prevent damage.

D Damage from corrosion costs billions of dollars annually.