CBSE Class 10 Science 2019 · Paper 31/1/1 · Question 22(a)
Blue litmus solution is added to two test tubes A and B containing dilute HCl and NaOH solution respectively. In which test tube a colour change will be observed? State the colour change and give its reason.
Answer
Test tube A: blue litmus turns red because HCl is an acid; NaOH is a base, so B stays blue.
The colour change is observed in test tube A (dilute HCl): the blue litmus solution turns red. Reason: HCl is an acid (it gives ions in water), and acids turn blue litmus red. NaOH in test tube B is a base, which does not change the colour of blue litmus, so B stays blue.
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