Think Without ink

Name the compound of silver which is used in the voters ink.

Change the sentence into indirect speech. Arun says, "There is no ink in the inkpot."

Suppose you are traveling in a train. All of a sudden you recognise your old student who is passing without a solutory remark. What will you think is such a condition?

Which of the following process will be observed, when a chalk stick is dipped in the solution of ink?