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.
Which of the following statements is true?
Metals conduct electricity while non-metals do not
Metals have high density, non-metals have low density
Metals form basic oxides, non-metals form acidic oxides
In the electro chemical series, metals are above hydrogen while non-metals are below hydrogen
Metals lose elections while non-metals gain electron during chemical reactions
Correct answer is E
- Chemical reactions in which electrons are transferred are called oxidation-reduction, or redox, reactions. Oxidation is the loss of electrons. Reduction is the gain of electrons. Oxidation and reduction always occur together, even though they can be written as separate chemical equations. -The most common reducing agents are metals, for they tend to lose electrons in their reactions with nonmetals. Option E is most appropriate.
Which of the following statements is an exception in the assumptions of the kinetic theory of gases?
Gases are composed of many elastic particles
The particles are of negligible size
The particles are in constant random motion
The particles are of negligible mass
The particles collide with each other
Correct answer is D
No explanation has been provided for this answer.
1.2 g
0.7 g
0.5 g
0.3 g
0.12 g
Correct answer is C
Mg + 2HCl → MgCl2 + H2
6 molar contains 6 Χ 36.5 gms 1000 cc
Solution i.e 6 Χ 36.5/2gms in 500 cc
= 3 Χ 36.5
24 gms of mg will react with 2 Χ 36.5 HCl to liberate 2 gm of hydrogen
∴ 6 gms will liberate 6 Χ 2/24 Χ 1 = 0.5 gm of H2
Under high pressure, real gases do not obey gas laws because their molecules?
have become more energetic
have become less energetic
have become smaller in size
decompose into atoms
start repelling each other
Correct answer is A
Van der Waals noticed the behavior of real gases at low temperature and high pressure possesses weak but short range forces.
Which of the following reactions is correct as as written?
FeCl2 + 3NH4OH → Fe(OH)3 + 3NH4Cl
Pb2O3 + 4HCl → PbCl2 + 2H2O
PbNO3 + H2S → PbS + 2HNO3
NaOH + H2SO4 → NaHSO4 +H2O
2NH4NO3 → N2 + 2H2O
Correct answer is D
No explanation has been provided for this answer.