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.
S block elements of the periodic table one made up of
groups 1, 2, 3
groups 1, and 2
group 3
group 3 to 7
Correct answer is B
S block elements only are made up of group 1 and 2 options A,C,D takes place of the other blocks in the periodic table p,d,f etc.
In the electrolysis of CuSo4(g) using platinum electrode the reaction at the anode is
4H+ 4e - 2H2
4OH= 4e- + 2H2O + O2
2OH - 2e- = 2OH
2OH- + 2OH = 2H2O + O2
Correct answer is B
40H − 4e → 2H2O + O2is the reaction of sun at the anode in the electrolysis of CuSO4 (g) using platinum particles. Option A,C,D are not formed as a result of the equation
The principal constituent of natural gas is
methane
ethane
propane
Butane
Correct answer is A
Methane CH4.A. is the principal and commercial constituent natural gas. Option B,C,D are also constituent of natural gas but they are not commercial and of economic importance
20
25
60
75
Correct answer is B
Let the relative abundance of the energy with mass 37 be
Total relative abundance of the isotope of mass 359100-k)
Total mass of isotope of mass 37-37x, while that of 35-359(100x)
-37x + 3500 − 35 − 35.5
-37x + 3500 − 35n − 35.5
Mean mass of chlorine atom − (2n + 3500)/ ÷ 100
= 35.5
2x + 3500 − 3550yx = 50/2
Chlorine gas turns damp starch-iodide paper
pink
colourless
red
dark blue
Correct answer is D
Chlorine turns a damp starch iodide paper into dark blue or blue black.