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.
In countries where the temperature fall below 273k, salt always spilled on the road in order to
increase the boiling point
increase the density of the ice
make the ice impure
reduce the freezing point of ice
Correct answer is D
No explanation has been provided for this answer.
Electronic configuration of an element 13 in the subsidiary energy level is
1s22s22p63s23p1
1s22s22p43p13s1
1s22s22p63s23p3
1s12s22p63s23p4
Correct answer is A
No explanation has been provided for this answer.
Which of the following gives a precipitation when treated with NaOH Solution?
AlCl3
NH4Cl
Na2CO3
CH3COONa
Correct answer is A
AlCl3 will give a precipitate when treated with solution. Option B,C,D will not give a precipitate when treated with NaOH solution
PCL5(g)= PCL3(g) + Cl2(g)
In the reaction above, a decrease in pressure will
Decelerate the reaction
Increase yield of Pcl3
Increase the yield of Pcl5
Accurate the reaction
Correct answer is B
If we decrease the pressure in the reaction, there will be rapid breakage spilling of pcl5. And these follows a principle that molecule of gases tends to move from a region of higher pressure to low pressure. Option A,C,D will not be affected by pressure decrease
According to the kinetic theory an absence in temperature causes the kinetic energy of particles to
decrease
increase
remain constant
be zero
Correct answer is D
No explanation has been provided for this answer.