Question

What is used for cleaning the loop of platinum wire?
A) $C{{l}_{2}}$
B) $N{{O}_{2}}$
C) $N{{H}_{3}}$
D) $HCl$

Answer 1

Hint:We first discuss briefly about flame test compounds of some metals. Then we see how some concentrated acids clean some metals. Then we find what is used for cleaning the loop of a platinum wire.

Complete step by step answer:

In flame test compounds of a few metals, in presence of conc. , shape special coloured flames. In this test, the compounds become unstable after which vapors shape one-of-a-kind colored flame’s. The motive of using conc. Is to transform the compounds into their metal chlorides. Because, the metal chlorides are very much volatile.
When heated in the flame the factors of the metals of the compounds come to be excited and go to higher power degrees. Later, when they return to the ground state, they emit extra power as visible light. As a result flames of different colors are formed for distinct metals. Such as for golden yellow, for lilac violet, for brick red flames are found.
The cause of the use of conc. Is to convert the compounds into their metal chlorides. Because, the metallic chlorides are very much unstable. When heated in the flame the factors of the metals of the compounds come to be excited and go to higher power degrees.
We use concentrated hydrochloric acid to clean the wire because any residues will form chlorides, that are unstable in the hot bunsen flame and therefore burn off.
Therefore, used for cleaning the loop of platinum wire.
Hence, option D is the correct answer.

Note:
A flame check is an analytic method used in chemistry to detect the presence of certain factors, more often than not metals ions, primarily based on every detail's characteristic emission spectrum. Samples are generally held on a platinum wire cleaned repeatedly with hydrochloric acid to do away with lines of preceding analytes. The compound is commonly made right into a paste with concentrated hydrochloric acid, as metallic halides, being unstable, supply better outcomes.