Exercises
Punjab Board Science Solutions for Exercises
Simple step-by-step solutions to Exercises questions of Acids, Bases and Salts from Science. Also get 3D topic explainers, cheat sheets, and unlimited doubts solving on EMBIBE.
Questions from Exercises with Hints & Solutions
Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?
Sodium hydroxide turns blue litmus red.
Sodium hydroxide and hydrochloric acid neutralize each other and form salt and water.
Indicator is a substance which shows different colors in acidic and basic solutions.
Tooth decay is caused by the presence of a base.
Explain why calamine solution is applied on the skin when an ant bites.
Explain why factory waste is neutralized before disposing it into the water bodies.
Consider the following statements:
(A) Both acids and bases change colour of all indicators.
(B) If an indicator gives a colour change with an acid, it does not give a change with a base.
(C) If an indicator changes colour with a base, it does not change colour with an acid.
(D) Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
