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.
147N + X → 178O + 11 H. In the above reaction, X is a?
neutron
helium atom
litgium atom
deuterium atom
Correct answer is B
No explanation has been provided for this answer.
How many lone pairs of electron are there on the central atom of the H2O molecules?
1
2
3
4
Correct answer is B
In a water molecule, oxygen is bonded to two hydrogen atoms. Leaving oxygen with four electrons which pair up with one another to form two lone pairs of electrons.
The nucleus of the isotope tritium, contains?
two neutrons with no protons
one neutron and one protons
two neutrons and one proton
two neutrons, one proton and one electron
Correct answer is C
No explanation has been provided for this answer.
number of molecules of the gas
density of the gas molecules
number of collisions between the gas molecules
number of collisions between the gas molecules and the walls of the container
Correct answer is D
No explanation has been provided for this answer.
10.0 s
12.5 s
17.7 s
32.0 s
Correct answer is B
100 cm3 of O2 diffuse 50 sec
∴ 100 cm3 of H2 → (100) / (100) x (50) /(1)
t1 50 sec
molecular mass H+ → 2 x 1 = 2
molecular mass of O2 16 x 2 = 32
T2 = t1 √M2/M1 = t2 = 50 √2/32
50√0.625 = 50 x 0.25 = 12.5 secs