Which of the following salts gives a white precipitate with $AgNO_3$ and dilute $H_2SO_4$,and also gives a green flame test?

Three different samples of a salt solution give the following test results: One sample gives a white precipitate with ammonia solution. One sample gives a white precipitate with dilute $NaCl$ solution. One sample gives a black precipitate with $H_2S$. Identify the salt.

$Fe^{2+}$ ion can be distinguished from $Fe^{3+}$ ion by

Which of the following statement$(s)$ is(are) correct with reference to the ferrous and ferric ions?

Which ions can be separated using concentrated $NaOH$?

Nessler's reagent is used to detect