(a) In a tabular form write a the colours of the following indicators in presence of acid and base :
litmus solution, phenolpthaleinsolution, methyl orange solution.
(b) Classify the following given substances A and B in acidic and basic giving reason
solution A ; [H⁺] < [OH^-]
solution B ; [H⁺] > [OH^-]

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Solution

Indicator Acid Base

Litmus solution Blue to red Red to blue

Phenolphthalein Colourless Pink

Methyl orange Yellow Pink

a) Solution A is having more hydroxide ion showing that it is basic.
b) Solution B is having more H⁺ showing that its acidic.

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Match the following:
$\begin{matrix} a) Litmus & 1) Blue in acidic, pink in basic soils b) Methyl orange & 2) Red in acidic, yellow in basic solutions c) Phenolphthalein & 3) Blue in basic, red in acidic solutions d) Color of Hydrangea & 4) Pink in basic, colorless in acidic solutions \end{matrix}$

The indicators which turn red in acid solution are :

(a) turmeric and litmus

(b) phenolphthalein and methyl orange

(d) phenolphthalein and litmus

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.

Question 19

Fill the blanks in the following sentences
(a) Lemon juice and vinegar taste ___ because they contain ___
(b) Turmeric and litmus are ___acid-base indicators.
(c) Phenolphthalein gives___colour with lime water
(d) When an acidic solution is mixed with a basic solution, they___ each other forming a and water.

Q. Identify the incorrect statements from the following.
a) Acids are bitter whereas bases are sour in taste.
b) Baking soda, tomatoes and grapes contain organic acids.
c) Acids and bases can be identified using turmeric, methyl orange and litmus solution.
d) Olfactory indicators change colours in acidic or basic solutions.

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Indicator	Acid	Base
Litmus solution	Blue to red	Red to blue
Phenolphthalein	Colourless	Pink
Methyl orange	Yellow	Pink

Indicator Acid Base Litmus solution Blue to red Red to blue Phenolphthalein Colourless Pink Methyl orange Yellow Pink a) Solution A is having more hydroxide ion showing that it is basic. b) Solution B is having more H+ showing that its acidic.

Indicator Acid Base

Litmus solution Blue to red Red to blue

Phenolphthalein Colourless Pink

Methyl orange Yellow Pink

a) Solution A is having more hydroxide ion showing that it is basic.
b) Solution B is having more H⁺ showing that its acidic.