passwella.
Menu

JAMB Chemistry 1986 Question 29

Question 29

Qualitative Analysis

In the course of an experiment, two gases X and Y were produced. X turned wet lead ethanoate to black and Y bleached moist litmus paper. What are the element(s) in each of the gases X and Y respectively?

  1. A.H and S;Cl
  2. B.H and O;Cl
  3. C.H and S;C and O
  4. D.H and Cl;S and O.
Show the answer and explanation

Answer: A (H and S;Cl)

Explanation

X blackens lead ethanoate paper, so it is hydrogen sulphide (H and S). Y bleaches moist litmus, so it is chlorine (Cl).