Indicators
Indicators: Overview
This topic covers concepts such as Neutralisation Reactions, pH of Salts, Presence of Hydrogen Ion in Acids, Dissociation of an Acid in Water, Generation of Hydronium Ion in Acidic Solutions, Dissociation of a Base in Water, pH Scale, etc.
Important Questions on Indicators
Beetroot indicator gives orange colour in basic solution.
What is the colour of the beetroot indicator in the acidic solution?
What is the colour of the beetroot indicator in the basic solution?
A solution turns red litmus blue, its pH is likely to be
What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) The temperature of the solution increases.
(ii) The temperature of the solution decreases.
(iii) The temperature of the solution remains the same.
(iv) Salt formation takes place.
A yellow stain of curry on a white cloth turns reddish brown when it comes in contact with soap. Why does it happen?
The neutral substance formed when an acid reacts with a base.
Name the acid present in vinegar. (Citric acid/Acetic acid)
When moist litmus paper is placed in a test tube of this gas, it turns red.
A diatomic gas that turns moist litmus paper from blue to red. (chlorine/hydrogen)
A gas which turns moist red litmus paper blue.
What is the effect of dilute hydrochloric acid on the colour of the red litmus indicator?
What is the effect of dilute hydrochloric acid on the colour of the blue litmus indicator:
Two solutions A and B when tested with universal indicator shows their pH values are and respectively. What are A and B?
The chemical equation that represents neutralization reaction among the following is
Which substance when used with butter having butyric acid can cure acidity
As the value of a neutral solution increases, its
A solution when treated with a universal indicator shows a value of . It is a
A reaction is called _____ reaction when acid and base react to form salt and water.
NaOH(aq) + HCl(aq) → NaCl(aq) + H2O is the example of a _____ reaction.
