The flame test colour of strontium is

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yellow

green

yellow-green

red

answer is D.

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Detailed Solution

The colour of the flame an element produces can be used by scientists to identify it because each element has a precisely defined line emission spectrum. A blue flame is produced by copper, a red flame by lithium and strontium, an orange flame by calcium, a yellow flame by sodium, and a green flame by barium.

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