A blue litmus paper was first dipped in dil. HCI and then in dil. NaOH solution. It was observed
that the colour of the litmus paper :(a) Changed to red(b) Changed first to red and then to blue(c) Changed blue to colourless(d) Remained blue in both the solutions

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Solution

A blue litmus paper is dipped in dilute HCl solution, it will turn into red because of the acidic nature of HCl solution. Then it is dipped in dilute NaOH solution , the colour of the litmus paper will now depend on the concentration of the NaOH. If the concentration of NaOH solution is higher than the concentration of HCl solution, then litmus paper will again turn into blue and if the concentration of NaOH solution is less than the concentration of HCl solution , then the colour of the litmus paper will fade but remain red.

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A blue litmus paper was first dipped in dil. HCI and then in dil. NaOH solution. It was observedthat the colour of the litmus paper :(a) Changed to red(b) Changed first to red and then to blue(c) Changed blue to colourless(d) Remained blue in both the solutions

A blue litmus paper was first dipped in dil. HCI and then in dil. NaOH solution. It was observed
that the colour of the litmus paper :(a) Changed to red(b) Changed first to red and then to blue(c) Changed blue to colourless(d) Remained blue in both the solutions