IS高手入~!!

False.

Strong alkali dissociates completely (not ionize, as they are made of ions) to form OH- in water.

An alkali is strong regardless of its molarity. 0.0001 M NaOH and 100 M NaOH are both strong alkali; 0.0001 M and 100 M NH3 are both weak alkali.

Concentrated alkali means that the amount of solute in the solution is high.

0.0001 M NaOH is dilute and 100 M NaOH is concentrated.
Weak alkali can also be concentrated (e.g. 100 M NH3)

SURE F
they are totally different
strong alkali is an alkali which can be fully ionized.
Concentrated alkali means the alkali solution has a very low amount of solvent compare with the solute.