Post Utme Chemistry Past Questions and Answers

Question 651:

What is the percentage by mass of oxygen in \(\mathrm{Al}_{2}\left(\mathrm{SO}_{4} \right)_{3} 2_{2} \mathrm{H}_{2} \mathrm{O}\) ?

\((A=27, S=32, H=1, O=16)\)

A. \(14.29 \%\)
B. \(25.39 \%\)
C. \(50.79 \%\)
D. \(59.25 \%\)

Question 652:

The filler in a cigarette reduces the nicotine, content by ____________

A. Burning
B. Adsorption
C. Evaporating
D. Absorption

Question 653:

\(3 \mathrm{Cu}+\mathrm{PHISO}_{3} \rightarrow 3 \mathrm{Cu}\left(\mathrm{NO}_{3} \right)+4 \mathrm{H}+\mathrm{NO}\)
In the equation above, the values of \(p\) and \(x\) respectlvely are ____________

A. 1 and 3
B. 2 and 3
C. 6 and 2
D. 8 and 2
BIOLOGY

Question 654:

Neutral, atoms: of neon with atomic number 10 have, the same number of electrons as ____________

A. \(\mathrm{O}^{2+}\)
B. \(\mathrm{Ca}^{2+}\)
C. \(\mathrm{K}^{+}\)
D. \(\mathrm{Mg}^{+}\)

Question 655:

The noble gases owe their Inactivity to ____________

A. Octet configuration
B. Cyclic shape
C. Hexagonal shape
D. Obtuse configuration