Post Utme Chemistry Past Questions and Answers

Question 901:

What are the oxidation numbers of manganese in the anions \(MnO _{2}\) and \(MnO ^{2}\) ?

A. \(+7 \&+6\)
B. \(+2 \&+2\)
C. \()+4 \&+4\)

Question 902:

The empirical formula of a hydrocarbon that contains \(93.3 \%\) carbon is \(C 12, H =13\)

A. \(CH\)
B. \(CH _{2}\)
C. \(C _{2} H\)
D. \(C _{2} H _{2}\)

Question 903:

The type of hybridization in all the carbon in saturated hydrocarbon is ___________

A. \(SP ^{3}\)
B. \(S P^{2}\)
C. SP
D. \(P S^{2}\)

Question 904:

Electrophiles are ___________

A. Electron deficient species
B. Electron rich species
C. Free radical species
D. Negatively charged species

Question 905:

A metallic element \(X\) formssan ont \(X 2\) what will be the formula of tetraoxosulphate of \(x\)

A. \(X \left( SO _{4}\right)_{3}\)
B. \(\left.SO _{4} C \right)
C. \times\left( SO _{4}\right) C _{4}\)
D. \(X _{3} SO _{4}\)