A) Phenolphthalein pink
B) Methyl orange yellow
C) Methyl orange red
D) Blue litmus red
Correct Answer: C
$ NaHCO_3 $ in water is alkaline in nature due to hydrolysis of $ HCO_3^{-} $ ion. $ NaCO_3 $ ⇌ $ N{a^{+}}+HCO_3^{-} $
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