Question

1- HCl Does not change the color of phenolphthalein
2- NaOH changes methly orange to red color
A. both 1,2 are true
B. both 1,2 are false
C. 1 is true and 2 is false
D. 1 is false and 2 is true​

Answer 1

Answer:

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⭐ Phenolphthalein does not change color in dry HCl gas because the pH value of dry HCl gas is 7 that is almost neutral. Phenolphthalein indicator changes its color at pH 9 in alkaline solution. Therefore in NH3 which is a strong base, it's color changes to red.

Explanation:

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Answer 2

The correct answer is option : C

• Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.
• Since HCl is an acid it does not change the colour of Phenolphthalein.
• Methyl orange shows red color in acidic medium and yellow color in basic medium.
• Since NaOH is a base it should show yellow colour.

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