1) Which of the following is the advantages of hydrogen bonds formed between ethanol molecules? a) Ethanol exists as a volatile liquid b) Ethanol dissolves in organic solvents. c) Ethanol could conduct electricity. d) Ethanol is soluble in water. 2) Which of the following substances form dative bonds? a) Ammonium ions, NH3 b) Methane, CH4 c) Carbonate ions, CO32- d) Hydroxide ions, OH- 3) Which statement is true about dative bonds? a) Its formation involves transfer of electrons b) Its formation involves sharing of electrons c) Its formation involves delocalising of electrons d) Its formation involves a big difference in electronegativity between two atoms 4) Substances G is a good heat and electrical conductor in solid and molten states. Which of the following chemical bond is found in substances G? a) Dative Bond b) Ionic Bond c) Covalent Bond d) Metallic Bond 5) Which of the following statements explains why aluminium is a better electrical conductor than sodium? a) Relative atomic mass of aluminium is greater than relative atomic mass of sodium. b) Aluminium forms metallic bonds but sodium forms ionic bond c) Aluminium atoms have more electrons than sodium atoms. d) Aluminium atoms have more valence electron than sodium atoms. 6) Which compound consists of only electrovalent bonds? a) Sodium Nitrate b) Carbon dioxide c) Calcium oxide d) Ammonium Chloride 7) Tetrachloromethane, CCl4 , is an example of covalent compound. Which of the following is the property of tetrachloromethane? a) Could conduct electricity in all states b) High melting and boiling points c) Do not dissolve in organic solvents d) Weak forces of attraction between its molecules 8) Substance Z have low melting point and boiling point and do not conduct electricity in all states. Which of the following is most probably substance Z? a) Sodium chloride b) Magnesium oxide c) Tetrachloromethane d) Silicon oxide 9) Which statement best explains why covalent molecules such as ammonia, NH3 dissolve in wter? a) The relative molecular mass of ammonia and the relative molecular mass of water is almost the same b) Ammonia molecule could form hydrogen bonds with water molecules c) Ammonia molecules could form dative bonds with water molecules d) Both ammonia and water form covalent molecules. 10) Atom X and atoms Y reacts to produce and ionic compound with the formula XY2. If the proton number of atom N is 17, what is the proton number of atom M? a) 9 b) 12 c) 11 d) 3

Quiz 5

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