71. An atom with a charge is called?
(a) An electron
(b) A metal
(c) A molecule
(d) An ion
answer
(d) An ion
72. Which two elements will combine to form a one-to-one compound?
(a) Magnesium and chlorine
(b) Potassium and fluorine
(b) Sodium and oxygen
(d) Lithium and Sulphur
answer
(b) Potassium and fluorine
73. When calcium atom, become a calcium ion (ca+2)?
(a) It loses an electron
(b) It gains electron
(c) It loses two electron
(d) Gains two electron
answer
(c) It loses two electron
74. Which two substances combine to generate covalent compounds?
(a) Sodium and oxygen
(b) Carbon and oxygen
(b) Copper and oxygen
(d) Magnesium and oxygen
answer
(d) Magnesium and oxygen
75. In the formation, of an ionic bond, the atoms taking part?
(a) Only gains electron
(b) Lose and gains electrons
(c) Only lose electrons
(d) Share electrons
answer
(b) Lose and gains electrons
76. Which of the following claims regarding covalent bonding is untrue?
(a) HCL contains one pair of shared electron
(b) CCL, contains four pairs of shared electrons
(c) H2O contains three pairs of shared electrons
(d) NH3 contains three pairs of shared electrons
answer
(c) H2O contains three pairs of shared electrons
77. Which group in the list below solely includes ionic compounds?
(a) Calcium oxide, hydrogen chloride, magnesium oxide
(b) Calcium oxide, magnesium oxide, sodium chloride
(c) Carbon dioxide, copper sulphate, hydrogen chloride
(d) Copper sulpahate, methane, sodium chloride
answer
(b) Calcium oxide, magnesium oxide, sodium chloride
78. What is the volume change for every unit of pressure change?
(a) Compressibility
(b) Density
(c) Mobility
(d) Pressure
79. Mass per unit volume is called?
(a) Compressibility
(b) Density
(c) Mobility
(d) Pressure
80. If the temperature stays constant, the volume of a given quantity of a gas is inversely proportional to the pressure applied.
(a) Boyles law
(6) Both of these
(b) Charles Law
(d) None of these
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