161. Identify the molecule with a double covalent bond?
A) O2
B) H2
C) N2
D) C2H2
162. Alkali metals belong to?
A) 1st group
B) 2nd group
C) 3rd group
D) 4th group
163. Modern periodic table consists of?
A) Two Blocks
B) Three Blocks
C) Four Blocks
D) Five Blocks
164. Isotopes of Hydrogen are?
A) 1
B) 2
C) 3
D) 4
165. One AMU (atomic mass unit) is equal to?
A) 1.66×10^-24 mg
B) 1.66×10^-24 g
C) 1.66×10^-23 g
D) 1.66×10^-24 kg
166. The most abundant element occurring in the Earth’s crust by weight is?
A) Silicon
B) Oxygen
C) Aluminium
D) Iron
167. Which metal is more malleable?
A) Gold
B) Sodium
C) Iron
D) Silver
168. Which of the following atoms does not have a neutron?
A) Oxygen
B) Hydrogen
C) Carbon
D) Nitrogen
169. The molar mass of H2SO4 is?
A) 98 g
B) 98 amu
C) 9.8 g
D) 9.8 amu
170. The empirical formula of Hydrogen peroxide is?
A) HO
B) H2O
C) HO2
D) H2O2
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