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Questions and Answers
What is the correct observation when red litmus paper is dipped into a 20% sodium hydroxide solution?
What is the correct observation when red litmus paper is dipped into a 20% sodium hydroxide solution?
- Red litmus paper turns blue (correct)
- Red litmus paper turns red
- Red litmus paper remains unchanged
- Red litmus paper turns green
When a student adds 2 ml of water to 2 ml of acetic acid in a test tube, what is the likely observation?
When a student adds 2 ml of water to 2 ml of acetic acid in a test tube, what is the likely observation?
- The solution becomes light orange
- Acetic acid floats over the surface of water
- Water floats over the surface of acetic acid
- The acetic acid dissolves readily in water (correct)
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?
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 (correct)
- A layer of water over the layer of acetic acid
- A layer of acetic acid over the layer of water
- A precipitate settling at the bottom of the test tube
How can a student test for the gas liberated when hydrochloric acid reacts with an active metal?
How can a student test for the gas liberated when hydrochloric acid reacts with an active metal?
Which pH value indicates a stronger acid, pH=5 or pH=2?
Which pH value indicates a stronger acid, pH=5 or pH=2?
What is the solution that reacts with crushed egg shells to give a gas that turns lime milky?
What is the solution that reacts with crushed egg shells to give a gas that turns lime milky?
Why does tooth decay start when pH of mouth is lower than 5.5?
Why does tooth decay start when pH of mouth is lower than 5.5?
When fresh milk changes into curd, will its pH value increase or decrease? Why?
When fresh milk changes into curd, will its pH value increase or decrease? Why?
Why does the flow of acid rainwater into a river make the survival of aquatic life difficult?
Why does the flow of acid rainwater into a river make the survival of aquatic life difficult?
How does the flow of acid rain water into a river make the survival of aquatic life difficult?
How does the flow of acid rain water into a river make the survival of aquatic life difficult?
Which observation is true about a dilute solution of acetic acid?
Which observation is true about a dilute solution of acetic acid?
What happens to the pH value of an aqueous solution when an acid and a base are mixed together?
What happens to the pH value of an aqueous solution when an acid and a base are mixed together?
Why does a solution react with crushed egg shells to produce a gas that turns lime milky?
Why does a solution react with crushed egg shells to produce a gas that turns lime milky?
What gas is produced when a solution reacts with crushed eggshells to turn lime milky?
What gas is produced when a solution reacts with crushed eggshells to turn lime milky?
What happens to the pH value when fresh milk changes into curd (yogurt)?
What happens to the pH value when fresh milk changes into curd (yogurt)?
Why does the flow of acid rain water into a river make the survival of aquatic life difficult?
Why does the flow of acid rain water into a river make the survival of aquatic life difficult?
Which observation is true about a dilute solution of acetic acid?
Which observation is true about a dilute solution of acetic acid?
What is the likely observation when a student tests for the gas liberated when hydrochloric acid reacts with an active metal?
What is the likely observation when a student tests for the gas liberated when hydrochloric acid reacts with an active metal?
What is the correct observation when red litmus paper is dipped into a 20% sodium hydroxide solution?
What is the correct observation when red litmus paper is dipped into a 20% sodium hydroxide solution?
What can a student observe when red litmus paper is dipped into a 20% sodium hydroxide solution?
What can a student observe when red litmus paper is dipped into a 20% sodium hydroxide solution?
What happens when a student adds 2 ml of water to 2 ml of acetic acid in a test tube?
What happens when a student adds 2 ml of water to 2 ml of acetic acid in a test tube?
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?
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?
How can a student test for the gas liberated when hydrochloric acid reacts with an active metal?
How can a student test for the gas liberated when hydrochloric acid reacts with an active metal?
Which observation is true about a dilute solution of acetic acid?
Which observation is true about a dilute solution of acetic acid?
Why does tooth decay start when pH of mouth is lower than 5.5?
Why does tooth decay start when pH of mouth is lower than 5.5?
Why does flow of acid rain water into a river make the survival of aquatic life difficult?
Why does flow of acid rain water into a river make the survival of aquatic life difficult?
What is the correct observation when red litmus paper is dipped into a 20% sodium hydroxide solution?
What is the correct observation when red litmus paper is dipped into a 20% sodium hydroxide solution?
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