Electrons flow towards the zinc rod
The zinc rod dissolves
The temperature of the soil changes
The blue colour of the solution gradually disappears
Copper metal is deposited
Correct answer is A
No explanation has been provided for this answer.
The chemical reaction which takes place at the anode (positive electrode) in electrolysis is?
oxidation
hydrolysis
dissociation
reduction
disproportionation
Correct answer is A
No explanation has been provided for this answer.
Which of the following silver halides is readily soluble in ammonium hydroxide?
Agl
AgBr
AgCl
AgF
None of the above
Correct answer is C
No explanation has been provided for this answer.
In which of the following is the oxidation state of oxygen different from its value in water?
OH-
H3O+
O-
H2O2
SO2
Correct answer is D
No explanation has been provided for this answer.
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
Correct answer is C
The gas liberated is H\(_2\)S which in the presence of lead acetate paper gives a black coloration