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

A 113.7 g/100 g of water

B 37.4 g/100 g of water

C 187 g/100 g of water

D 18.7g/100 g of water

A NH₄Cl/H₂O and H₂O/CH₃COONa

B NaOH/HCl and HNO₃/KOH

C NH₄OH/NH₄Cl and CH₃COOH/CH₃COONa

D NH₄OH/CH₃COOH and NH₄Cl/CH₃COONa

A CH₃OO⁻ as a strong base picks up H+ and causes excess OH⁻ ions.

B Na+ is a strong acid and causes high concentration of H+.

C CH₃COOH does not produce sufficient amount of H+ ions.

D The OH⁻ ions from NaOH are not completely neutralized.

A produces more OH ions in water than H+ ions.

B has a bitter taste.

C donates a pair of electrons to a chemical species.

D donates a proton in a chemical reaction.

A HCl = 36.5 g=2 equivalents

B H₂SO₄=98 g=2 equivalent

C H₃PO₄= 98 g=2 equivalents

D H₂SO₄= 49 g= 4 equivalents

A H₃O⁺ and NH₃

B HNO₃ and NO₃^-

C HCl and NH₄⁺

D HPO₄^2- and PO₄^3-

A The unit of particles in covalent compounds are ions.

B The intermolecular forces of attraction in covalent compounds are strong.

C Covalent compounds exist as separate molecules.

D There are no forces of attraction between the molecules in covalent compounds.

A the C=O bonds in both COS and CO2 are polar.

B CO2 has a net dipole moment of zero.

C sulphur is more electronegative than oxygen.

D regions of high negative charge is distributed equally around the central atom in COS.

A The 2s and three 2p orbitals in carbon hybridize to form four sp³ orbitals.

B The 2s and two 2p orbitals in carbon hybridize to form three sp² orbitals.

C Carbon can form two hybrid orbitals as it has got only two half-filled orbitals.

D The 2s and one 2p orbitals in carbon hybridize to form two sp orbitals.

A sp³d

B sp³

C sp

D sp²