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.
6.02 x 1022
6.02 x 1023
3.01 x 1023
1.51 x 1023
Correct answer is C
1 mole = Molar mass of gas = Avogadros number
32g of O2 = 6.02 x 1023
16g of O2 = x
x = \(\frac{16 \times 6.02 \times 10^23}{32}\) = 3.01 x 1023
1.12dm3
2.24dm3
3.72dm3
4.48dm3
Correct answer is B
\(\frac{\text{volume}}{\text{molar volume}}\) = 0.05
1 mole of ethane produces 2 moles of carbon(iv)oxide
∴ 0.05 mole of ethane will produce x moles of carbon(iv)oxide
= \(\frac{\text{volume}}{22.4}\) = 0.05 X 2 X 22.4 = 2.24dm\(_3\)
Which of the following trioxonitrate(V) salts would decompose on heating to form a metal?
Cu(NO3)2
AgNO3
Pb(NO3)2
KNO3
Correct answer is B
No explanation has been provided for this answer.
i
ii
i and ii
ii and iii
Correct answer is C
No explanation has been provided for this answer.
Which of the following oxides is ionic?
P4O10
MgO
Al2O3
SO2
Correct answer is B
No explanation has been provided for this answer.