Question

B) what happens to the black ink mark on the chalk when it put into water

Answer 1

hi friend
The black Mark may rub

Answer 2

The black ink in the chalk that is then put in the water.

The water then starts to flow through the chalk since the chalk is a pourus and hence the water slowly goes through the chalk which eventually it pushes out the ink from the chalk and hence it will be the ink in the water after a while that makes the water black.