| Substance P turned methyl orange yellow. |
| Substance Q turned phenolphthalein colorless. |
| Substance R did not have any effect on blue or red litmus. |
| Substance S turned China rose indicator green. |
| P, Q, R and S could be respectively |
A) Lemon juice, fermented milk, salt solution and milk of magnesia.
B) Sugar solution, vinegar, water and curd.
C) Lime water, apple juice, sugar solution and saliva
D) None of these.
Correct Answer: C
Solution :
Lime water is basic in nature hence, it turns methyl orange yellow. Apple juice contains maleic acid hence, it turns phenolphthalein colourless. Sugar solution is neutral hence, it has no effect on litmus solutions. Saliva is basic in nature hence, it turns China rose indicator green.
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