bio Flashcards
What is the main focus of Chapter 5 in NCERT Class 10 Science?
The main focus is on ‘Acids, Bases and Salts’.
What is the pH scale used for?
The pH scale is used to measure the acidity or basicity of a solution.
True or False: A pH value of 7 indicates a neutral solution.
True
What color does litmus paper turn in acidic solutions?
Red
Fill in the blank: A substance that donates protons (H+) in a solution is called a ______.
Bronsted acid
What is formed when an acid reacts with a base?
Salt and water
What is the chemical formula for hydrochloric acid?
HCl
Which substance is known as a strong base?
Sodium hydroxide (NaOH)
What is the effect of acids on metals?
Acids react with metals to produce hydrogen gas and a salt.
True or False: All bases are slippery to the touch.
True
What is a common use of sodium bicarbonate?
It is used as a baking soda.
What happens when an acid reacts with a carbonate?
It produces carbon dioxide, water, and a salt.
Which indicator is used to test for acids and bases?
Litmus indicator
Fill in the blank: The process of neutralization involves the reaction between an acid and a ______.
Base
What is the general formula for a salt?
It is formed by the reaction of an acid and a base.
Which gas is released when an acid reacts with a metal carbonate?
Carbon dioxide (CO2)
True or False: Bases turn red litmus paper blue.
True
What is the importance of pH in biological systems?
It is crucial for enzyme activity and biochemical reactions.
What is the effect of acids on indicators?
Acids change the color of indicators to signify acidity.
What is the term for a solution with a pH less than 7?
Acidic solution
Name one natural indicator.
Turmeric
What is a common household acid?
Vinegar (acetic acid)
What is the role of bases in cleaning agents?
They help in breaking down grease and stains.
Fill in the blank: The neutralization reaction between an acid and a base produces ______.
Salt and water
