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Oxides of Sulphur

Following obs...

Question

Following observations were made when indicators were added to three unknown solutions A, B and C. Choose the option depicting correct set of compounds A, B and C.

Compound Phenolphthalein Methyl Orange

A No Change No Change

B Pink Yellow

C No Change Red

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Q. Mention the colour changes observed when the following indicators are added to acids:
(a) Alkaline phenolphthalein solution.
(b) Methyl orange solution.
(c) Neutral litmus solution.

Q. Identify the following solutions, whether they are acid or alkali.

Solution	Change in Indicator			Acid/Alkali
	Litmus	Phenolphthalein	Methyl orange
1.	...	No change	...
2.	...	...	Orange colur turns red
3.	Red litmus turns blue	...	...

Q. When a student added a few drops of methyl orange indicator to a colourless solution, the solution turned red. Which of the following should he add in excess so that the colour changes to yellow ?
(1) NaOH solution
(2) H₂SO₄ solution
(3) Lemon juice
(4) Vinegar solution

Q. The following observations were made when different indicators were added to three unknown solutions A, B and C. Choose the option depicting correct set of compounds A, B and C.

Compound	Phenolphthalein	Methyl Orange
A	Methyl Orange	No change
B	Pink	Yellow
C	No change	Red

Q. Following observations were made when different indicators were added to three unknown solutions A, B and C. Choose the option depicting correct set of compounds A, B and C.

Compound	Phenolphthalein	Methyl Orange
A	No change	No change
B	pink	yellow
C	No change	pink

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