Question

Which one indicates a red flame when ionized with a Bunsen burner?
(A) $0.1{\text{M MgC}}{{\text{l}}_2}$
(B) $0.1{\text{M HCl}}{{\text{O}}_4}$
(C) $0.1{\text{M N}}{{\text{H}}_4}{\text{OH}}$
(D) $0.1{\text{M KOH}}$
(E) $0.1{\text{M LiN}}{{\text{O}}_3}$

Answer 1

Hint : The visible, gaseous element of a fire is called a flame. A very exothermic chemical reaction occurring in a narrow zone causes it. Very hot flames have enough ionised gaseous components with enough density to be classified as plasma.

Complete Step By Step Answer:
Colored fire is a popular pyrotechnic effect used in stage shows, fireworks, and by fire artists all around the world. A flame's hue is dominated by blackbody radiation from soot and steam, and it might be red, orange, blue, yellow, or white. When additional chemicals are introduced to the fuel burning process, their atomic emission spectra might vary the frequencies of visible light radiation released - in other words, the colour of the flame changes depending on the chemical additions. Flame colouring is also a fantastic technique to show how fire transforms when exposed to heat, as well as how it affects the matter surrounding it. Pyrotechnicians usually employ metal salts to tint their flames. To dissolve the essential compounds, certain combinations of fuels and co-solvents are required. Color enhancers (typically chlorine donors) are also commonly used, with polyvinyl chloride being the most popular. The flame test, in which metal cations are examined by placing the sample in a flame and examining the colour generated, is a practical use of coloured fire. When 0.1 M $LiN{O_3}$ is ionised with a Bunsen burner, it produces a crimson flame.
Metal ions give flames their distinct colour.
Red: Lithium, strontium
Orange: Calcium
Yellow: Sodium
Green: Barium, copper
Violet: Potassium.

Note :
Flame colourants are becoming increasingly popular among campers. Scouts and other outdoor enthusiasts have packed garden hose through pieces of copper tubing with holes punched throughout to generate a variety of flame colours on campfires. To create effects, these packets of flame colourants are tossed over a bonfire or into a fireplace. These compounds are particularly good in giving their colour to an existing flame, but they are not combustible on their own. The methods required to make a powder or solid that creates a colourful flame when lighted are more complicated. Both a fuel and an oxidizer are required to get a powder to burn satisfactorily.