P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:
(a) blue litmus red?
(b) red litmus blue?

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Solution

a) Neither solution will turn blue litmus red.
Solution P is sodium chloride, formed from a strong acid, hydrochloric acid (HCl), and a strong base, sodium hydroxide (NaOH). When sodium chloride is dissolved in water, it gets hydrolysed to give equal amounts of hydroxide and hydrogen ions, which makes its aqueous solution neutral. Therefore, the solution of sodium chloride will have no effect on red or blue litmus paper.

b) Sodium hydroxide solution (Q) will turn red litmus blue, because solution Q is basic.

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Similar questions

Four students A, B, C and D were studying the effect of the solutions of hydrochloric acid, sodium hydroxide, sodium chloride and pure water respectively on blue litmus solution. Which of the students observed the colour change of blue litmus solution to red?
(1) A
(2) B
(3) C
(4) D

The salt whose aqueous solution will turn blue litmus to red is :

(a) ammonium sulphate

(b) sodium acetate

(d) potassium carbonate

Q. Sodium hydroxide turns blue litmus red.

Q. Sodium chloride will turn

(a) blue litmus red
(b) methyl orange yellow
(c) red litmus blue
(d) none of the above

What happens when?

a) A solution of calcium hydroxide is added to red litmus paper

b) A solution of sodium chloride is added to red litmus paper

c) A solution of lemon juice is added to blue litmus paper

d) A solution of distilled water is added to red litmus paper

e) A solution of sodium hydroxide is added to turmeric [5 MARKS]

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P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn: (a) blue litmus red? (b) red litmus blue?

P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:
(a) blue litmus red?
(b) red litmus blue?