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Standard VIII

Chemistry

Zones of Candle Flame

A solution of...

Question

A solution of compound $Z$ gives a light blue precipitate with aqueous ammonia. The precipitate
dissolves in an excess of ammonia.
A flame test is done on compound $Z$ .
What is the colour of the flame?

Blue-green

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Lilac

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Red

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Solution

The correct option is A Blue-green
Copper is the most common element used to cause a green flame ! You can also use chemicals to achieve a green flame :
Green flame is possibly the coolest color to turn flames. It's not a color you get from the fuel, so you have to add a chemical to get the effect. The color comes from the ion emission spectra, so you can use any of the chemicals that produce green in the analytical method known as the flame test. The most readily available compounds are:
boric acid (boron compounds), sold as a disinfectant and roach killer
borax (boron compounds), sold as a laundry booster and home cleaner
copper sulfate (copper(II) compounds), sold as a root killer and algicide
However, other chemicals will make green flames:
thallium compounds
antimony compounds
barium compounds
manganese (II) compounds
molybdenum compounds
ammonium compounds
phosphates moistened with sulfuric acid

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Q. In qualitative analysis, when

H_{2} S

is passed through an aqueous solution of salt acidified with dil. HCI, a black precipitate is obtained. On boiling the precipitate with

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A light bluish-green crystalline compound responds to the following tests:

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_{2}

[HgI

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A solution of compound Z gives a light blue precipitate with aqueous ammonia. The precipitatedissolves in an excess of ammonia.A flame test is done on compound Z.What is the colour of the flame?

A solution of compound $Z$ gives a light blue precipitate with aqueous ammonia. The precipitate
dissolves in an excess of ammonia.
A flame test is done on compound $Z$ .
What is the colour of the flame?