Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
Chromatography is used to separate components of mixture which differ in their rates of ?
diffusion
migration
reaction
sedimentation
Correct answer is B
Chromatography is a method of separating mixtures by using a moving solvent on filter paper. The rate at which each solute moves up the paper depends on how strongly it is absorbed by the paper, and how soluble it is in the solvent.
less than 3.4
greater than 3.4
unaltered
the same as that of the pure water
Correct answer is A
The addition of conc HCL makes the solution more acidic and the solution falls below the original value
The shape of ammonia molecule is?
Trigonal planar
Octahedral
Square planar
Tetrahedral
Correct answer is A
The ammonia molecule has a trigonal pyramidal shape with the three hydrogen atoms and an unshared pair of electrons attached to the nitrogen atom.
Which of the following gases will rekindle a brightly splint?
NO\(_2\)
NO
N\(_2\)O
CL\(_2\)
Correct answer is C
Nitrogen(I)Oxide rekindles a brightly glowing splinter but extinguishes a feebly glowing one which is not hot enough to decompose the gas to liberate oxygen
28
32
44
71
Correct answer is D
500cm\(^3\) of the gas weighed 1.58
: 22400cm\(^3\) of the gas weight
[22400 X 1.58g] ÷ [ 500 ]
= 71