# Study the given table carefully. $\begin{matrix} Substances & Blue\text{ }litmus\text{ }solution~~~ & Phenolphthalein~ & Methyl\text{ }orange & China\text{ }rose\text{ }indicator \\ 1.\text{ }Wasps\text{ }sting & Red & Colourless & Red & Red \\ 2.\text{ }Lime\text{ }water & No\text{ }Change & Pink & Yellow & Green \\ 3.\text{ }Spinach & No\text{ }Change & Pink & Yellow & Green \\ 4.\text{ }Window\text{ }cleaner & Red & Colourless & Red & Red \\ 5.\text{ }Curd & Red & Colourless & Red & Red \\\end{matrix}$. Which of them shows the incorrect change in the colour of indicators? (A) 1 and 2 (B) 3 and 5 (C) 1, 2 and 3 (D) 1, 3 and 4

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Hint: Among the given substances some are alkaline in nature and some are acidic in nature. Different acid-base indicators are used to determine whether the solution is acidic or basic because of their ability to change the color in different pH. Thus by knowing the nature of given substances we can identify the incorrect change in the colour of indicators.