27 Questions
What is the correct observation when red litmus paper is dipped into a 20% sodium hydroxide solution?
Red litmus paper turns blue
When a student adds 2 ml of water to 2 ml of acetic acid in a test tube, what is the likely observation?
The acetic acid dissolves readily in water
After adding 4 ml of acetic acid to 4 ml of distilled water in a test tube, what does the student observe after leaving it to settle for about 10 minutes?
A clear colorless solution
How can a student test for the gas liberated when hydrochloric acid reacts with an active metal?
By observing the liberation of hydrogen gas
Which pH value indicates a stronger acid, pH=5 or pH=2?
pH=2
What is the solution that reacts with crushed egg shells to give a gas that turns lime milky?
HCl
Why does tooth decay start when pH of mouth is lower than 5.5?
The acid produced by bacteria attacks the enamel at this pH level
When fresh milk changes into curd, will its pH value increase or decrease? Why?
The pH value will decrease due to the formation of lactic acid.
Why does the flow of acid rainwater into a river make the survival of aquatic life difficult?
Acid rainwater decreases the pH of the river water
How does the flow of acid rain water into a river make the survival of aquatic life difficult?
It lowers the pH of the river water.
Which observation is true about a dilute solution of acetic acid?
It has a low pH value.
What happens to the pH value of an aqueous solution when an acid and a base are mixed together?
The pH value remains unchanged.
Why does a solution react with crushed egg shells to produce a gas that turns lime milky?
Due to the presence of hydrochloric acid (HCl).
What gas is produced when a solution reacts with crushed eggshells to turn lime milky?
HCl
What happens to the pH value when fresh milk changes into curd (yogurt)?
Decreases due to the formation of lactic acid
Why does the flow of acid rain water into a river make the survival of aquatic life difficult?
It lowers the pH of the river water
Which observation is true about a dilute solution of acetic acid?
Turns blue litmus paper red
What is the likely observation when a student tests for the gas liberated when hydrochloric acid reacts with an active metal?
Formation of a colorless, odorless gas
What is the correct observation when red litmus paper is dipped into a 20% sodium hydroxide solution?
Turns blue
What can a student observe when red litmus paper is dipped into a 20% sodium hydroxide solution?
The red litmus paper turns blue
What happens when a student adds 2 ml of water to 2 ml of acetic acid in a test tube?
The acetic acid dissolves readily in water
After adding 4 ml of acetic acid to 4 ml of distilled water in a test tube, what does the student observe after leaving it to settle for about 10 minutes?
A clear colorless solution
How can a student test for the gas liberated when hydrochloric acid reacts with an active metal?
By placing a lighted match stick near the gas to check for a pop sound
Which observation is true about a dilute solution of acetic acid?
It smells like vinegar and turns red litmus blue
Why does tooth decay start when pH of mouth is lower than 5.5?
Acid produced in the mouth attacks the enamel
Why does flow of acid rain water into a river make the survival of aquatic life difficult?
Decreases the concentration of dissolved oxygen in the river water
What is the correct observation when red litmus paper is dipped into a 20% sodium hydroxide solution?
(I), (II) and (IV)
Test your knowledge of acids, bases, and salts with this quiz. Questions cover topics such as reactions, properties, and identification of substances as acidic or basic.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
