Which statement about aqueous weak acids is correct?
Weak acids are always dilute aqueous solutions.
Weak acids dissociate fully in aqueous solution.
When a weak acid is added to blue litmus paper, it stays blue.
When a weak acid is added to solid magnesium, effervescence is seen.
D
What is the colour of thymolphthalein in dilute hydrochloric acid?
blue
red
yellow
colourless
D
Which row describes the reactions of magnesium hydroxide and magnesium oxide?
effect of heat on hydroxide
effect of heating oxide with carbon
forms magnesium oxide
magnesium and carbon dioxide formed
forms magnesium oxide
no reaction
no reaction
magnesium and carbon dioxide formed
no reaction
no reaction
B