GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The results of testing a colorless solution with three indicators are shown in the table below. Which formula could represent the solution tested?Indicator ResultRed Litmus stays RedBlue Litmus turns Redphenolphthalein clear
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NaOH (aq)
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H2O (l)
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H2SO4 (aq)
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CuSO4 (aq)
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Explanation:
Detailed explanation-1: -A blue litmus paper will turn red in an acidic solution but remain blue in a basic solution. A red litmus paper changes colour in a basic solution and becomes blue whereas remains unchanged in an acidic solution. In a neutral solution, the paper is purple. Then, we have phenolphthalein.
Detailed explanation-2: -Acidity or Alkalinity If you dip blue litmus paper into lemon juice, it turns red. If you dip it into soapy water, it turns blue. Because lemon juice is acidic, it makes blue litmus paper turn red.
Detailed explanation-3: -The aqueous solution of sulphuric acid changes blue litmus to red. In aqueous solution sulphuric acid completely ionizes so it is a strong acid.
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