Q20. Renu takes a burning substance and collects the evolved vapours in a
test tube, making sure that they do not escape. Asmall amount of water is
added to the test tube, To the solution obtained a few drops of blue litmus
solution are added. The litmus solution turns red. Which of the following
could be the burning substance
A. Mg
B.S
C. Na
D. Fe
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Answer:
Na
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