Ayaan tested the nature of a few common substances with phenolphthalein indicator and summarized the results in the following table.
Test tube Colour change with phenolphthalein indicator
1 Colourless
2 Pink
3 Colourless
4 Pink
Which of the following substances could be present in test tubes 1, 2, 3 and 4 ?

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1 - Lime juice, 2 - Soda water, 3 - Lime water, 4 – Vinegar

1 - Common salt, 2 - Lemon juice, 3 – Vinegar, 4 - Lime water

1 - Lemon juice, 2 - Lime water, 3 - Common salt solution, 4- Baking soda

1 - Baking soda, 2 - Lemon juice, 3 - Lime water, 4 - Soda water

answer is C.

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Detailed Solution

Phenolphtalein indicator show pink colour in basic medium, colour less ness in both
acidic and neutral medium so,
Lemon juice – acidic – colour less
Lime water – Basic – Pink colour
Common salt – Neutral – Colour less
Baking soda – Basic – Pink colour

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