Which best describes milk?
Milk is slightly acidic with a pH of around 6.5 to 6.7 due to the presence of lactic acid.
Which lists the substances from least to most acidic?
Ammonia is basic, blood is slightly basic, milk is slightly acidic, and orange juice is more acidic.
Which substance is the most alkaline?
Ammonia is the most alkaline among the given options.
Which substance has a pH value closest to neutral?
Blood has a pH close to neutral, around 7.4.
Which of the following would be most useful in testing if a substance is either an acid or a base?
Litmus paper is used to test if a substance is acidic or basic.
What do acidic substances generate in a medium?
Acidic substances generate \( \text{H}^+ \) ions in a medium.
What is produced by basic substances in a solution?
Basic substances produce \( \text{OH}^- \) ions in a solution.
The strength of an acid depends on the concentration of:
The strength of an acid depends on the concentration of hydronium ions (\( \text{H}_3\text{O}^+ \)).
What increases the strength of an acid?
More hydronium ions increase the strength of an acid.
The strength of a base is determined by the concentration of:
The strength of a base is determined by the concentration of hydroxyl ions (\( \text{OH}^- \)).
What are bases that dissolve in water called?
Bases that dissolve in water are called alkalis.
How are salts formed?
Salts are formed by treating an acid with a base.
Which of the following is a commonly used salt in daily life?
Sodium chloride is a commonly used salt in daily life.
Sodium bicarbonate is also known as:
Sodium bicarbonate is commonly known as baking soda.
Blue litmus paper turns red in:
Blue litmus paper turns red in an acidic solution.
What happens to red litmus in a basic solution?
Red litmus paper turns blue in a basic solution.
In a neutral solution, litmus paper:
Litmus paper shows no change in a neutral solution.
The strength of an acid or base is shown using:
The strength of an acid or base is shown using the pH scale.
What is the pH value of a neutral solution?
A neutral solution has a pH value of 7.
An acidic solution has a pH value:
An acidic solution has a pH value less than 7.
A basic solution will have pH:
A basic solution will have a pH greater than 7.
Who defined acids and bases based on ionization in solution?
Arrhenius defined acids and bases based on ionization in solution.
What does hydrochloric acid (HCl) produce in water?
Hydrochloric acid (HCl) produces \( \text{H}^+ \) and \( \text{Cl}^- \) ions in water.
What ion is responsible for the acidity of a solution?
The \( \text{H}^+ \) ion is responsible for the acidity of a solution.
Which of the following is a base?
NaOH is a base.
What do bases produce in aqueous solution?
Bases produce \( \text{OH}^- \) ions in an aqueous solution.
Which of the following is a base that is also an alkali?
NaOH is a base that is also an alkali.
What is formed when an acid reacts with a base?
When an acid reacts with a base, salt and water are formed.
What is the process of acid and base reaction called?
The process of an acid and base reaction is called neutralization.
What happens to temperature during a neutralization reaction?
Temperature increases during a neutralization reaction.
Which salt is formed by NaOH and HCl?
NaOH and HCl react to form NaCl.
Which combination produces potassium chloride (KCl)?
The combination of KOH and HCl produces potassium chloride (KCl).
What is the taste of most acids found in foods like vinegar and lemon?
Most acids found in foods like vinegar and lemon have a sour taste.
What is the typical taste of bases?
Bases typically have a bitter taste.
Lactic acid is present in:
Lactic acid is present in yogurt.
What is "milk of magnesia" chemically?
"Milk of magnesia" is chemically magnesium hydroxide.
Which base is found in soap?
Potassium hydroxide is a base found in soap.
Which of these conducts electricity well in molten or solution form but not in solid state?
Salts conduct electricity well in molten or solution form but not in solid state.
Why did the bulb not glow in sugar and water solution?
The bulb did not glow in sugar and water solution because sugar solution does not conduct electricity.
If blue litmus turns red, the substance is:
If blue litmus turns red, the substance is acidic.
If red litmus paper turns blue, the substance is:
If red litmus paper turns blue, the substance is basic.
If neither red nor blue litmus changes colour, the substance is:
If neither red nor blue litmus changes color, the substance is neutral.
What is the likely nature of lemon juice based on its sour taste?
Lemon juice is likely acidic based on its sour taste.
Which acid is produced in the stomach to help digest proteins and kill harmful bacteria?
Hydrochloric acid is produced in the stomach to help digest proteins and kill harmful bacteria.
What pH is required for certain digestive enzymes in the stomach to function properly?
Certain digestive enzymes in the stomach require a pH less than 2 to function properly.
What is the main compound of vinegar?
The main compound of vinegar is acetic acid.
Which acid is used in the production of fertilizers and explosives?
Nitric acid is used in the production of fertilizers and explosives.
What is the use of benzoic acid's salt?
Benzoic acid's salt is used to preserve food.
Which base is used in making soaps and detergents?
Sodium hydroxide is used in making soaps and detergents.
What is magnesium hydroxide used for?
Magnesium hydroxide is used as an antacid.
Calcium hydroxide is used to:
Calcium hydroxide is used to neutralize acidic soil.
What kind of salt is present in calamine solution?
Zinc carbonate is the salt present in calamine solution.
What can neutralize the formic acid injected by an ant sting?
Baking soda can neutralize the formic acid injected by an ant sting.
Which of the following is not a use of calcium hydroxide?
Making vinegar is not a use of calcium hydroxide.
What is the range of the pH scale?
The range of the pH scale is from 0 to 14.
A solution with a pH less than 7 is considered:
A solution with a pH less than 7 is considered acidic.
A solution with a pH greater than 7 is:
A solution with a pH greater than 7 is alkaline.
What does a pH value close to 7 indicate?
A pH value close to 7 indicates a neutral solution.
Which of the following substances is neutral in nature?
Pure water is neutral in nature.
Which of the following is most alkaline?
Sodium hydroxide is the most alkaline among the given options.
What is an indicator?
An indicator is a dye that changes color depending on pH.
Which of the following is not a chemical indicator?
Beet juice is not a chemical indicator.
What is the colour of phenolphthalein in a basic medium?
Phenolphthalein is pink in a basic medium.
What is the colour of phenolphthalein in an acidic medium?
Phenolphthalein is colorless in an acidic medium.
What colour does methyl orange turn in a basic medium?
Methyl orange turns yellow in a basic medium.
In acidic conditions, bromophenol blue shows what colour?
In acidic conditions, bromophenol blue shows yellow color.
Which of the following is used to determine pH most accurately?
A pH meter is used to determine pH most accurately.