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.
more CuCl is formed at 40oC
more CuCl2 is formed at 10oC
Less CuCl2 is formed at 10oC
there is no change in the amount of CuCl2 formed at 40oC and10oC
more CuCl is consumed at 40oC
Correct answer is B
No explanation has been provided for this answer.
exothermic
endothermic
isothermal
isomeric
hygroscopic
Correct answer is B
No explanation has been provided for this answer.
Which of the following statements is FALSE?
Copper (ll) ion can be reduced to copper (l) ion by hydrochloric acid and zinc
Sodium metal dissolves in water giving oxygen
Nitrogen is insoluble in water
Carbondioxide is soluble in water
lead has a higher atomic weight than copper
Correct answer is B
No explanation has been provided for this answer.
Na2SO4(aq)
Kl (aq)
an alkali
an acid
a hydrocarbon
Correct answer is D
No explanation has been provided for this answer.
1,800 kg
900 kg
600 kg
2,400 kg
1,200 kg
Correct answer is D
2\(C_2H_6 + 7O_2 →4CO_2 + 6H_2O\)
addition of oxygen causes weight gain, expelled \(CO_2\) results in weight loss
for oxygen added;
2moles \(C_2H_6\) = 7moles \(O_2\)
2(30)g \(C_2H_6\) = 7(2)(16)g \(O_2\)
3000kg \(C_2H_6\) = X kg \(O_2\)
cross multiplying X = 11200kg
for \(CO_2\) expelled;
2moles \(C_2H_6\) = 4moles \(CO_2\)
2(30)g \(C_2H_6\) = 4(44)g \(CO_2\)
3000kg \(C_2H_6\) = Y kg \(CO_2\)
cross multiplying Y = 8800kg
since X > Y, the plane has a net weight gain.
Net weight gain = X - Y = 11200-8800 = 2400kg.