Post Utme Chemistry Past Questions and Answers

Question 1006:

The following are chemical entities identifiable during qualitative analysis. i. \(SO _{4}{ }^{2-}\) ii. \(H _{3} O\) iii. \(NH _{4}\) iv. \(OH\).
Which of them can be detected-by litmus paper?

A. Ii & iv only
B. Ii only
C. I & iii only
D. Iv only

Question 1007:

I. \(NaHCO _{3}\) II. \(NaHSO _{4}\) III. \(NaCl\).
Which of these will dissolve in water to give alkaline solution?

A. I, ii & iii
B. Ii only
C. I only
D. I & ii only

Question 1008:

The quantum number that divides shells into orbital is ____________

A. Spin
B. Magnetic
C. Azimuthal
D. Principal

Question 1009:

Water can be obtained as the only product during the____________

A. Combustion of hydrocarbons
B. Neutralization of an acid by base
C. Combustion of hydrogen
D. Electrolysis of brine

Question 1010:

The colour changes observed when testing for reducing agents using acidified potassium heptaoxodichromate (VI) solution is ____________

A. Yellow to purple
B. Orange to green
C. Green to orange
D. Purple to yellow