Question

Bottle X contains NaOH solution and bottle Y contains distilled water. On dipping pHpaper strips in each of the solutions, the colour seen in 'X' and 'Y' respectively are:(a)blue, red (b) blue, green(c) green, blue(d) red, blue


Ans?


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Answer 1

(b) blue, green

The pH paper strips also known as the universal indicators help us to classify substances as acidic, basic or neutral in nature and depends upon the content of the hydrogen in the substance.

Here, the substances are NaOH and distilled water in the bottles X and Y respectively.

NaOH

NaOH (Sodium hydroxide) is a basic substance and the pH scale will lie to the right hand side. As it is only relatively basic (pH value - 11), the colour of the pH paper will be blue.

Distilled Water

Distilled water is devoid of any kind of acidic or basic impurities. Therefore it would be neutral in nature (pH value - 7). Therefore, the colour of the pH paper will be green.

From these, we can confirm that the the required correct option is Option D: blue, green.

Attached below is the colour scale of a pH paper.

Answer 2

Answer:

Explanation:

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