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A student Prepared $20\%$ sodium hydroxide solution in a beaker to study saponification reaction. Some observations related to this are given below <br>(I) Sodium hydroxide solution turns red litmus blue <br>(II) Sodium hydroxide readily dissolves in water <br>(III) The beaker containing solution appears cold when touched from outside <br>(IV) The blue litmus paper turns red when dipped into the solution The correct observations are :

$\begin{array}{1 1} \text{(a) I, II and IV} \\ \text{ (b) I, II and III} \\ \text{ (c) only III and IV } \\ \text{ (d) only I and II} \end{array} $

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