Post Utme Chemistry Past Questions and Answers

Question 281:

Which of the following molecules is not linear in shape?

A. \(\mathrm{CO}_{2}\)
B. \(\mathrm{O}_{2}\)
C. \(\mathrm{NH}_{3}\)
D. \(\mathrm{HCl}\)

Question 282:

Which of the following reactions do alkenes undergo?

A. Addition reaction
B. Elimination reaction
C. Condensation reaction
D. Substitution reaction

Question 283:

Which of the following arrangements is in o. decreasing electro positivity?

A. Fluorine, Boron, Beryllium, Nitrogen, Lithium
B. Lithium, Beryllium, Boron, Nitrogen, Fluorine
C. Fluorine, Nitrogen, Boron, Beryllium, Lithium
D. Lithium. Nitrogen, Boron, Fluorine, Beryllium

Question 284:

How much heat will be liberated if \(10 \mathrm{~g}\) of hydrogen burns in excess oxygen according to the following thermochemical equation? \(\mathrm{H}_{2(\mathrm{~g})}+1 / 2 \mathrm{O}_{2(\mathrm{~g})} \cdots \mathrm{H}_{(2)(\mathrm{l})} \Delta \mathrm{H}=-286 \mathrm{~kJ}\)

A. \(-1430 \mathrm{k}]\)
B. \(-2860 \mathrm{~kJ}\)
C. \(-572 \mathrm{~kJ}\)
D. \(-286 \mathrm{~kJ}\)

Question 285:

What type of bond exist between an element with atomic number 12 and \(Y\) with atomic number \(17 ?\)

A. Electrovalent
B. Covalent
C. Metallic
D. Dative