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.
The solution of a sample in a tube will be identified as a chloride if it gives
a white precipitate on addition of AgNO3 and barium chloride solutions
a white precipiate when acidified with HCI, and then AgNO3 solution added
a white precipitate when acidified with dilute HNO3 and then AgNO3 solution added
a white precipitate when acidified with dilute H2SO4 and then barium nitrate solution added
a pungent smell of chlorine gas when dilute HCI and MnO2 are added
Correct answer is C
No explanation has been provided for this answer.
The reaction 3C(s) + 2Fe2O3(s) = 4Fe(s) + 3CO2(g): \(\Delta\)H =46.0 kJ is
isothermic
adiabatic
isobaric
endothermic
exothermic
Correct answer is D
No explanation has been provided for this answer.
The vapour density of a gas may be defined as
the mass of a unit volume of the gas compared to an equal volume of water vapour
the mass of a unit volume of the gas compared to an equal volume of hydrogen
the mass of a unit volume of the gas compared to an equal volume of oxygen
the mass of a unit volume of the gas minus the vapour pressure of water
two times the relative molecular mass of the gas
Correct answer is B
No explanation has been provided for this answer.
the coke is a powerful reducing agent and easily converts the iron oxide to iron
the calcuim carbonate reacts with SiO2 an earthly impurity in the ore, to from calcuim silicate
the coke will react with the iron produced to form steel
all the carbondioxide required in the process comes from the decomposition of the calcium carbonate
the calcium carbonate decomposes to give calcium oxide, which then forms calcium silicate with the earthly impurity
Correct answer is E
No explanation has been provided for this answer.
Z is efflorescent
Y and Z are efflorescent
Y and Z are deliquescent
Y and Z are hygroscopic
Y is deliquescent
Correct answer is C
A deliquescent compound is a compound that, on exposure to the atmosphere, tends to absorb moisture from the atmosphere in large quantities. Hence, Y and Z are DELIQUESCENT.