Test tube A contains HCl solution and test tube B contains NaOH solution. Which is true? * Blue litmus in A changes to red which on dipping in B again becomes blue Red litmus in A changes to blue which on dipping in B again becomes red Blue litmus in A changes to red but it remain red in B Red litmus in A changes to blue but it remains blue in B.
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Test tube A contains dilute HCl and test tube B contains dilute NaOH. On adding blue litmus solution to both the test tubes, the colour of test tube A will change from blue to red while the colour of test tube B will remain same. This is because HCl is an acid and acid turns blue litmus to red.
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