JAMB - Chemistry (1980 - No. 21)
When dilute hydrochloric acid is added to iron(ll)sulphide, the gas evolved will?
turn moist red litmus paper blue
turn lime water milky
blacken lead acetate paper
rekindle a glowing splint
burn a sqeakly pop
הֶסבֵּר
The gas liberated is H\(_2\)S which in the presence of lead acetate paper gives a black coloration