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Universal Indicator

Which one of ...

Question

Which one of the following statements is correct about universal indicator?

A

It is a mixture of

H C l

and

N a O H

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B

It is a mixture of many indicators

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C

It is a solution of phenolphthalein in alcohol

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D

It is a solution of phenolphthalein in water.

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Solution

The correct option is B It is a mixture of many indicators
A universal indicator is a blend of $p H$ indicator solutions made to identify the $p H$ of the solutions over a wide range of values.
Universal indicator is a mixture of many indicators such as-
Thymol blue, methyl red, bromothymol blue and phenolphthalein.

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Similar questions

Q. One or more of the following substances viz

B a C l_{2}, N a_{2} S O_{4}, C a C O_{3}, N a O H a n d Z n S O_{4}

are present in a mixture. On dissolving the mixture in water, a clear solution is obtained which
gives a pink colour with phenolphthalein. To the solution dilute

H C l

is added gradually when a precipitate is formed initially which dissolves in excess. The composition of the mixture is:

Q. A solution contains a mixture of

N a_{2} C O_{3}

N a O H .

Using phenolphthalein as indicator

35 m L

of mixture required

20 m L

0.80 N H C l

for the end point. With methyl orange,

35 m L

of solution required

37.5 m L

H C l

for the end point. What is the weight of

N a_{2} C O_{3}

N a O H

respectively in the mixture?

An unknown mixture contains one or two of the following :

C a C O_{3}, B a C l_{2}, A g N O_{3}, N a_{2} S O_{4}, Z n S O_{4} a n d N a O H

The mixture is completely soluble in water and solution gives pink colour With phenolphthalein. When dilute hydrochloric acid is gradually added to the solution, a precipitate is formed which dissolves with further addition of the acid.

The white precipitate is_______.

Q. A solution contains a mixture of

N a_{2} C O_{3}

N a O H .

Using phenolphthalein as indicator

35 m L

of mixture required

20 m L

0.80 N H C l

for the end point. With methyl orange,

35 m L

of solution required

37.5 m L

H C l

for the end point. What is the weight of

N a_{2} C O_{3}

N a O H

respectively in the mixture?

Q. Given two mixtures: (A)

N a O H

N a_{2} C O_{3}

(B)

N a H C O_{3}

N a_{2} C O_{3}

.

100

mL of mixture (A) required

a

b

1 M

H C l

in separate titration using phenolphthalein and methyl orange indicators respectively while

100

mL of mixture (B) required

x

y

H C l

solution is separate titration using the same indicators.

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