A salt which burns with apple green flame is 

A student added acetic acid to test tubes I, II, III and IV containing the labelled substances and then brought a burning splinter near the mouth of each test tube.

The splinter would be extinguished when brought near the mouth of test tube

A student took two test tubes containing $2 \mathrm{mL}$of dilute hydrochloric acid and added zinc granules to test tube (A) and solid sodium carbonate to test tube (B) as shown below.

The correct observation would be