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.
1 and 1
1 and 2
2 and 1
3 and 1
Correct answer is C
No explanation has been provided for this answer.
Atomic number
Electron affinity
Ionization potential
Atomic radius
Correct answer is D
No explanation has been provided for this answer.
The electron configuration of two elements with similar chemical properties are represented by?
1s22s22p5 and 1s22s22p4
1s22s22p4 and 1s22s22p63s1
1s22s22p63s1 and 1s22s1
1s22s22p4 and 1s22s1
Correct answer is C
No explanation has been provided for this answer.
The temperature of a body decreases when drops of liquid placed on it evaporate because?
the atmospheric vapour pressure has a cooling effect on the body
a temperature gradient exists between the drops of liquid and the body causing the latter to vaporate
the heat of vapourization is drawn from the body causing it to cool
the random motion of the liquid molecules causes a cooling effect on the body
Correct answer is C
No explanation has been provided for this answer.
0.90 atm
0.80 atm
0.70 atm
0.60 atm
Correct answer is A
Total no mole = 0.2 + 0.2 + 0.3 = 0.7
Partial pressure of He = (0.3)/(0.7) x 2.1 =0.90