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.
electroplating
Arc-welding
reducing and mixture of their metallic
cooking a molten of the metals
Correct answer is D
Alloy is a metal that consist of two or more metals mixed together e.g. is mass which is an alloy of copper and zinc. Are not prepared with option A,B,C, and the do not result in mixture and metals together
Electronic configuration of an element 13 in the subsidiary energy level is
\( 1s^2 2s^2 2p^6 3s^2 3p^1 \)
\( 1s^22s^2 2p^4 3p^1 3s^1 \)
\( 1s^2 2s^2 2p^6 3s^2 3p^3 \)
\( 1s^1 2s^2 2p^6 3s^2 3p^4 \)
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