Chemistry MCQS

91. Triple covalent bond involves _ electrons.
A) 2
B) 4
C) 5
D) 6

92. Long form of periodic table is based upon?
A) Mendeleeve’s postulates
B) Atomic mass
C) Mass number
D) Atomic number

93. Who discovered Neutron?
A) Chadwick
B) J.J. Thomson
C) Rutherford
D) None of the above

94. What is the most abundant element occurring in the ocean?
A) Oxygen
B) Hydrogen
C) Nitrogen
D) Silicon

95. Rusting of iron requires :
A. Oxygen only
B. Oxygen and carbon dioxide
C. Oxygen and water
D. Carbon dioxide only

96. Uranium eventually decays into stable isotopes of :
A. Lead
B. Polonium
C. Thorium
D. Radium

97. Which of the following contains a high content of lead ?
A. Low octane fuel
B. High octane fuel
C. Coal
D. Cooking gas

98. What are the main particles of an atom?
A. Neutron, electron, and proton
B. Proton and electron
C. Proton, electron, and neutron
D. Proton and Neutron

99. Which particles of the atom have a positive charge?
A. Proton
B. Neutron
C. Electrons
D. None of these

100. Which particle of the atom has no charge?
A. Proton
B. Neutron
C. Electrons
D. None of the above