Jamb Chemistry 1983 Past Questions and Answers

Question 36:

• JAMB 1983

3. 06 g of a sample of potassium trioxochlorate (V) (KCIO) was required to make a saturated solution with 10cm³ of water at 25^oC. The solubility of the salt at 25^oC is [K =39, Cl = 35.5, O = 16]

A. 5.0 moles dm³
B. 3.0 moles dm³
C. 2.5 moles dm³
D. 1.0 molesv
E. 0.5 moles dm³

Question 37:

• JAMB 1983

The cracking process is very important in the petroleum industry because it.

A. Gives purer products
B. Yields more lubricants
C. Yields more engine fuels
D. Yields more asphalt
E. Yields more candle wax

Question 38:

• JAMB 1983

A gas that can behave as a reducing agent towards chlorine and as an oxidizing agent toward hydrogen sulphide is

A. O₂
B. NO
C. SO₂
D. NH₃
E. CO₂

Question 39:

• JAMB 1983

Which of the following solutions will give a white precipitate with barium chloride solution and a green flame test?

A. Na₂SO₄
B. CuSO₄
C. CaSO₄
D. CaCI₂
E. (NH₄)₂SO₄

Question 40:

• JAMB 1983

The mass of an atom is determined by

A. Its ionization potential
B. Its electrochemical potential
C. The number of protons and electrons
D. The number of neutrons and protons
E. The number of neutrons and electrons