Post Utme Chemistry Past Questions and Answers

Question 1026:

The products formed when sodium hydrogen trioxocarbonate (IV) is heated strongly are ____________

A. \(CO _{2} \& NaH\)
B. \(Na -\) \({ }_{2} CO _{3}, CO _{2}\) \& \(H _{2} O\)
C. \(CO _{2}\) \& \(H _{2} O\)
D. \(Na _{2} CO _{3}\) \& \(H _{2} O\)

Question 1027:

An element \(X\) forms a volatile hydride \(X H _{3}\) with a vapour
density of \(17.0\). The relative atomic mass of \(X\) is ____________

A. 34
B. 31
C. 20
D. 14

Question 1028:

Which shell and orbital respectively is the location of an electron having the quantum numbers ____________
\(n=3, l=2\) and \(m\) \(=2\)

A. O-shell and d-orbital
B. \(l\)-shell and p-orbital
C. M-shell and d-orbital
D. N-shell and f-orbital

Question 1029:

Effects of pollution include the following except ____________

A. Environmental degradation
B. Global warming
C. Ozone layer depletion
D. Heavy rainfall

Question 1030:

\(20 cm ^{3}\) of a gaseous hydrocarbon and \(150 cm ^{3}\) of oxygen were exploded in a closed vessel at room temperature. After cooling, \(110 cm ^{3}\) of gases remained. After absorption by concentrated sodium hydroxide solution the volume left was \(50 cm ^{3}\), the molecular formula of the hydrocarbon is ____________

A. \( C _{3} H _{6}\)
B. \(C _{4} H _{10}\)
C. \(C _{3} H _{8}\)
D. \(C _{4} H _{8}\)