Which of the following oxides is amphoteric?
Na2O
Fe2O3
AI2O3
CaO
CuO
Correct answer is C
No explanation has been provided for this answer.
0.1 mole
0.2mole
0.3 mole
1.0 mole
2.9 moles
Correct answer is C
No explanation has been provided for this answer.
The following salts dissolve readily in cold water except
CaCI2
PbSO4
(NH4)2SO4
Na2CO3
Na2SO3
Correct answer is B
No explanation has been provided for this answer.
Copper (ll) tetraoxosulphate (VI) is often added to swimming pools because it
prevents the growth of algae
coagulates suspended particles
neutralizes dissolved gases in water
reacts with any excess chlorine present
increases the amount of dissolved oxygen
Correct answer is A
No explanation has been provided for this answer.
Metals which react with steam only when they are red-hot include
copper
sodium
calcium
gold
iron
Correct answer is E
No explanation has been provided for this answer.