Post Utme Chemistry Past Questions and Answers

Question 996:

Candidate devised the following for the separation of the components of some mixtures.
i. components of ink; principle involved is chromatography ii. Components of water and kerosene; principle involved is separating funnel iii. Components of iodine and sodium chloride, principle involved is sublimation. In which of the above is the principle used correct?

A. I only
B. Ii only
C. Iii only
D. I, ii and iii

Question 997:

Which of the following procedures will separate a mixture of sand, sodium chloride and iodine into its components?

A. Add water; filter; sublime; evaporate to dryness
B. Add water; sublime; filter; evaporate to dryness
C. Sublime; filter; add water; evaporate to dryness
D. Sublime; add water; filter; evaporate to dryness

Question 998:

The type of bonds in ammonium chloride are ____________

A. Covalent and electrovalent
B. Dative and covalent
C. Dative and electrovalent
D. Covalent, dative and electrovalent

Question 999:

Which of the following types of bonding does not produce a compound?

A. Ionic bonding
B. Covalent bonding
C. Dative bonding
D. Metallic bonding

Question 1000:

The combining powers of \(HCO _{3}, O , Na , Cl\), respectively are ____________

A. \(-2,1,-1,+1\)
B. \(1,2,1,1\)
C. \(+1,-2,+1,-1\)
D. None of these