Question

Questions based on Flame test:

1) Which type of flame is used for flame test?

2) Which colour is imparted from the flame by Sodium salt?

3) Which colour is imparted from the flame by Calcium salt?

4) Which colour is imparted from the flame by Potassium salt?

5) Which acid is taken to perform Flame Test?​

Answer 1

Answer:

1] Clean a platinum or nichrome (a nickel-chromium alloy) wire by dipping it into concentrated hydrochloric acid and then holding it in a hot (non-luminous) Bunsen flame.

2] When the excited electron returns to the ground state , it emits the extra energy in the yellow region of the electromagnetic spectrum . Therefore , sodium imparts yellow colour to the flame .

3] The colour of the light depends upon the metal (lithium(I) gives a magenta red-pink flame, calcium an orange red flame, potassium a lilac flame, strontium a crimson red flame, copper(II) gives a blue or green flame and sodium(I) gives a yellow flame).

4] Potassium lilac (pink).

5] Clean a platinum or nichrome (a nickel-chromium alloy) wire by dipping it into concentrated hydrochloric acid and then holding it in a hot Bunsen flame. Repeat this until the wire produces no color in the flame.