When an atom gains an electron, it becomes properties
A. chemically inactive
B. negatively charged
C. oxidized
D. a cation
E. a complex ion
B
3.
The alkali metals exhibit similar chemical properties because
A. they occur in the combined state
B. they have the same number of vallence electrons
C. they form crystalline salts
D. their salts are soluble in water
E. they are highly reactive
B
4.
What is the likely formula of compound formed between element M in group two and element X in group seven?
A. M7X2
B. M2X
C. M2X7
D. MX2
E. MX6
D
5.
''Equal volumes of all gases at the same temperature and pressure contain the same number of molecules'' is an expression of
A. Charles Law
B. Boyle's Law
C. Avogadro's Law
D. Graham's Law
E. Gay Lussac's Law
C
6.
What volume of carbon (lV) oxide is produced at s.t.p. when 2.5g of CaCO3 reacts with excess acid according to the following equation? CaCO3 + 2HCI → CaCI2 +H2O + CO2 [CaCO3 = 100; molar volume of a gas at s.t.p = 22.4dm3]
A. 11.20dm3
B. 5.60dm3
C. 2.24dm3
D. 0.56dm3
E. 0.28dm3
D
7.
A solution of pH 7 is
A. acidic
B. neutral
C. concentrated
D. dilute
E. saturated
B
8.
Which of the following equations represents a neutralization reaction?