Question 316:

• JAMB 1983

A mixture of common salt, ammonium chloride and barium sulphate can best be separated by

A. Addition of water followed by filtration then sublimation
B. Addition of water followed by sublimation then filtration
C. Sublimation followed by addition of water then filtration
D. Fractional distillation
E. Fractional crystallization

Question 317:

• JAMB 1983

Which of the following relationships between the pressure P, the volume V and the temperature T, represents an ideal gas behaviour?

A. P \(\alpha\) VT
B. P \(\alpha\) T/V
C. PT \(\alpha\) V
D. PV \(\alpha\) I/T
E. P \(\alpha\) V/T

Question 318:

• JAMB 1983

The colour imparted to a flame by calcuium ion is

A. Green
B. Blue
C. Brick-red
D. Yellow
E. Lilac

Question 319:

• JAMB 1983

In the reaction M + N P;∆H = + QKJ. Which of the following would increase the concentration of the product?

A. Decreaseing the concentration of N
B. Increasing the concentration of P
C. Adding a suitable catalyst
D. Decreasing the temperature
E. Increasing the temperature

Question 320:

• JAMB 1983

In which of the following processes is iron being oxidized?
1 Fe + H₂SO₄ → FeSO₄ +H₂
2 FeSO₄ + H₂S → FeS + H₂SO₄
3 2FeCI₂ + Cl₂ → 2FeCl₃
4 2FeCl₃ + SnCl₂ + → 2FeCl₂ + SnCl₄

A. 1 only
B. 2 only
C. 3 only
D. 1 and 3
E. 2 and 4