Post Utme Chemistry Past Questions and Answers

Question 476:

The existence of two or more forms of the same element in the same physical state is known as ____________

A. Allotropy
B. Resonance
C. Hybridization
D. Isotopy

Question 477:

In which of the following are radioactive isotopes used?

A. Scientific research
B. Dating techniques
C. Treatment of cance
D. All of the above

Question 478:

The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as ____________

A. Tyndal effect
B. Diffusion
C. Osmosis
D. Brownian movement

Question 479:

The main characteristic features 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

Question 480:

In 1898, which scientist proposed that the atom is a sphere of positively charged matter in which negatively charged electrons are embedded ____________

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