UNICAL Chemistry 2008/2009 Past Questions

Practice each question, then open it to see the full details.

The main characteristics feature of transition metals are that they

A.have the same atomic size
B.are reducing agents
C.forms ions easily
D.have variable oxidation states

In 1898, which scientist proposed that the atom is a sphere of positively charged matter in

A.Ernest Rutherford
B.Max Planck
C.J.J. Thomson
D.Robert Millikan

Oxygen gas is collected in the laboratory by

A.upward displacement of air
B.upward displacement of water
C.downward displacement of water
D.using a gas layer

CuO + H₂ → Cu + H₂O in the reaction above, CuO is _________

A.oxidized to copper
B.reduced to copper
C.chemically converted to copper
D.reversed to copper

Isotopes are atoms of the same element with ___________

A.different protons
B.mass above 50
C.inter convertible masses
D.different masses

A reaction is in equilibrium when ____________

A.the rate of the forward reaction is equal to the rate of the reverse reaction
B.the reaction rate of the forward and backward reaction are zero
C.its rate is reversible
D.it does not produce any product again

The boiling point of a liquid such as methanol is the temperature at which its

A.vapour pressure is equal to 1 atmosphere
B.vapour pressure is equal to the atmospheric pressure
C.reactants and products are at standard state.
D.vapour pressure doubles atmospheric pressure

Alkenes and ________ are compounds that contain a multiple bond each.

A.alkanes
B.benzene
C.alkynes
D.benzaldehyde

A palm fruit dropped to the ground from the top of a tree 45m tall, how long does it take to reach the ground? (g = 10m/s²)

A.1s
B.2s
C.3s
D.5s

___________ is due to the formation of hydrogen gas bubbles around the copper plate of a simple cell

A.polarization
B.depolarization
C.local action
D.amalgamation