Question

sound of chalk on blackboard​

Answer 1

Answer:

The two sounds rated as the most unpleasant, they said, were fingernails scratching on a chalkboard and a piece of chalk running against slate. ... They found that the offensive sounds changed the listeners' skin conductivity significantly, showing that they really do cause a measureable, physical stress reaction

Explanation:

and it is so irritating sound

Answer 2

Answer:

the answer is grima.............