171. An electrolyte is a substance that produces _____ solution when dissolved in water.
(A) conducting
(B) nonconducting
(C) poorly conducting
(D) B and C

172.  A _____ consists of the elements in any one horizontal row of the periodic table.
(A) block
(B) base
(C) group
(D) period

173. A _____ consists of the elements in any one column of the periodic table.
(A) block
(B) base
(C) group
(D) period

174. One atomic mass unit (amu) is a mass unit equal to exactly one-twelth the mass of a _____ atom.
(A) carbon-8
(B) carbon-12
(C) carbon-16
(D) carbon-20

(A) D
(B) A
(C) E
(D) C

176. The mass number is the total number of _____ and _____ in nucleus of an atom.
(A) protons, neutrons
(B) protons, electrons
(C) neutrons, electrons
(D) electrons, positrons

177.  Isotopes are atoms whose nucleus have the same number of _____ but different number of _____.
(A) protons, neutrons
(B) protons, electrons
(C) neutrons, electrons
(D) electrons, positrons

178.  The atomic mass unit (amu) is equal to
(A) 1.66054×10^–15 kg
(B) 1.66054×10^–19 kg
(C) 1.66054×10^–23 kg
(D) 1.66054×10^–27 kg

179.  Burning of sodium in chlorine produces
(A) clouds
(B) pencil
(C) salt
(D) smoke

180. The molecular formula of surcose (sugar or table sugar) is
(A) C₆H₁₂O₆
(B) C₁₂H₂₂O₁₁
(C) C₆H₁₂
(D) C₁₂H₂₂