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Edet Archibong provided a contribution 5 months ago

Question 3301 | Chemistry Past Questions

D is the correct anwser.
Nonmetalic oxides ( anhydrides) dissolve in water to form their corresponding acids. Eg SO2(g), SO3(g), CO2(g) and NO2(g) dissolve in water to form aqueous solutions of H2SO3(aq), H2SO4(aq), H2CO3(aq) and HNO3(aq) acids.

Edet Archibong provided a contribution 5 months ago

Question 95 | Chemistry Past Questions

Even though the anwser is correct, I need to point out a few things for the sake of the students.
1) CaCO3(s) is a solid. Only gases occupy a volume of 22.4dm3 at s.t.p

Solution To the problem:
a.) write out the balanced equation of the reactants and products of the chemical reaction. You will see that
The stoichometric ratio of CaCO3(s) to CO2 (g) is 1 : 1
Hence 0.0075mole of CACO3(s) reacts with 0.015mole of HCL(aq) to produce 0.0075 mole of CACL2(aq), 0.0075 mole of CO2(g) and 0.0075 mole of H2O (l)

1 mole of CO2(g) has volume of 22.4dm3 at s.t.p
0.0075 mole of CO2(g) = 0.0075 x 22.4 = 0.168dm3 = 168cm3


Edet Archibong replied to okoh agha emmanuel 6 months ago

Question 4 | Physics Past Questions

No, the correct anwser is A. The question is asking for the incorrect statement among the options. Soft iron is more magnetized than steel hence A is the correct anwser.

Edet Archibong provided a contribution 6 months ago

Edet Archibong provided a contribution 6 months ago

Question 292 | Mathematics Past Questions

From the diagram, <POR is 110°, hence the correct anwser is option B, 20°

Edet Archibong provided a contribution 6 months ago

Question 272 | Mathematics Past Questions

Correct anwser answer is (- 1/8) and it is not in the options