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.
lowering the pressure of the reaction
increasing the surface area of the reaction
increasing the rate of the reaction
increasing the energy barrier of the reaction
Correct answer is C
No explanation has been provided for this answer.
Which of the following pairs of substances will react further with oxygen to form a higher oxide?
CO2 and H2O
NO and H2O
CO and CO2
SO2 and NO
Correct answer is D
No explanation has been provided for this answer.
In the shown experiment (Fig. 1) the litmus paper will initially
be bleached
turn green
turn red
turn blue
Correct answer is D
NH4Cl→NH3+HCl. rate of diffusion of substances depends too on their molar mass, the smaller the molar mass of a substance the faster the rate of diffusion of that substance. so the litmus paper initially turns blue because ammonia will get to it first since it diffuses faster than HCl.
The periodic classification is an arrangement of the elements
atomic weights
isotopic weights
molecular weights
atomic numbers
Correct answer is D
Elements in the periodic table are arranged according to their atomic number (proton number). Electronegativity increase from left to right while atomic radius increases down the group
Elements in the periodic table are arranged according to their atomic number (proton number). Electronegativity increase from left to right while atomic radius increases down the group