You are provided with aqueous solutions of three salts A , B and C . 2 ‐ 3 drops of blue litmus solution, red litmus solution and phenolphthalein were added to each of these solutions in separate experiments. The change in colour of different indicators were recorded in the following table: Sample With blue litmus solution With red litmus solution With phenolphthelein A No change Turns blue Turns pink B No change No change No change C Turns red No change No change On the basis of above observations, identify A , B and C from the following options:

A = CH 3 COONa , B = NaCl , C = FeCl 3

A = NaCl , B = CH 3 COONa , C = FeCl 3

A = FeCl 3 , B = NaCl , C = CH 3 COONa

A = FeCl 3 , B = CH 3 COONa , C = NaCl

MEDIUM

Earn 100

Define synthetic indicators.

Important Questions on Acids and Bases

EASY

Science>Chemistry>Acids and Bases>Indicators

What happens, when methyl orange solution mixed with

HCl

MEDIUM

Science>Chemistry>Acids and Bases>Indicators

You are provided with aqueous solutions of three salts $A, B$ and $C$ . $2 ‐ 3$ drops of blue litmus solution, red litmus solution and phenolphthalein were added to each of these solutions in separate experiments. The change in colour of different indicators were recorded in the following table:

Sample	With blue litmus solution	With red litmus solution	With phenolphthelein
A	No change	Turns blue	Turns pink
B	No change	No change	No change
C	Turns red	No change	No change

On the basis of above observations, identify $A, B$ and $C$ from the following options:

MEDIUM

Science>Chemistry>Acids and Bases>Indicators

A solution turns methyl orange into yellow the approximate

pH

of solution is

EASY

Science>Chemistry>Acids and Bases>Indicators

The indicators which turn red in acid solution are:

MEDIUM

Science>Chemistry>Acids and Bases>Indicators

Which of the following is not an olfactory indicator?

MEDIUM

Science>Chemistry>Acids and Bases>Indicators

Acid turn methyl orange:

MEDIUM

Science>Chemistry>Acids and Bases>Indicators

The colour of Methyl orange in alkali solutions is _____ .

EASY

Science>Chemistry>Acids and Bases>Indicators

An indicator is added to Potassium Hydroxide and the solution turns pink:

Name the indicator that is added.

MEDIUM

Science>Chemistry>Acids and Bases>Indicators

What is an indicator? Name three indicators.

EASY

Science>Chemistry>Acids and Bases>Indicators

Two solutions

X

and

Y

are tested with universal indicator. Solution

X

turns orange whereas solution

Y

turns red. Which of the solutions is a stronger acid?

MEDIUM

Science>Chemistry>Acids and Bases>Indicators

The rapid change of pH near the stoichiometric point of an acid-base titration is the basis of indicator detection. pH of the solution is related to ratio of the concentrations of the conjugate acid (Hln) and base (ln^-) forms of the indicator by the expression

MEDIUM

Science>Chemistry>Acids and Bases>Indicators

Name the source from which litmus solution is obtained. What is the use of this solution?

EASY

Science>Chemistry>Acids and Bases>Indicators

A beaker of concentrated hydrochloric acid has a pH of 1. What colour will full range universal indicator turn if it is added to this beaker? Is it a strong or a weak acid?

MEDIUM

Science>Chemistry>Acids and Bases>Indicators

Why does a yellow curry stain on a white shirt turn red when washed with soap?

HARD

Science>Chemistry>Acids and Bases>Indicators

Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and the third is a sugar solution. How will you identify them? You have only turmeric indicator.

EASY

Science>Chemistry>Acids and Bases>Indicators

Name two natural indicators.

EASY

Science>Chemistry>Acids and Bases>Indicators

A solution turns red litmus blue, its pH is likely to be:

MEDIUM

Science>Chemistry>Acids and Bases>Indicators

Is the distilled water acidic/basic/neutral? How would you verify it?

EASY

Science>Chemistry>Acids and Bases>Indicators

What is a universal indicator? For what purpose is it used?