Acids and Bases
8 minFull explanation, worked examples & memory tricks in the app
Kit Library / Science / Chemistry
⚡ Topic Learning KitAcids & Bases
English 16 leveled MCQs 26 flashcards Free
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Leveled MCQ practice
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All 16 questions, laddered from warm-up to topper-level, each with its answer and the reasoning behind it.
Warm-up · 9 questions
Q1. Which of the following is a property of acids?
Beginner
A
They feel slippery
B
They have a bitter taste
C
They turn blue litmus red
D
They turn red litmus blue
Show the answer
C · They turn blue litmus red
Acids turn blue litmus paper red, while bases turn red litmus blue.
Q2. Which of the following is a property of bases?
Beginner
A
They react with metals to produce hydrogen gas
B
They turn red litmus blue
C
They turn blue litmus red
D
They taste sour
Show the answer
B · They turn red litmus blue
Bases turn red litmus paper blue, while acids turn blue litmus red.
Q3. What is the pH range of acidic solutions?
Beginner
A
0 to 7
B
Less than 7
C
7 to 14
D
Exactly 7
Show the answer
B · Less than 7
Acidic solutions have a pH less than 7. A pH of 7 is neutral, and greater than 7 is basic.
Q4. What is the pH range of basic solutions?
Beginner
A
Greater than 7
B
0 to 14
C
Exactly 7
D
Less than 7
Show the answer
A · Greater than 7
Basic solutions have a pH greater than 7. A pH of 7 is neutral, and less than 7 is acidic.
Q5. What is the pH of a neutral solution?
Beginner
A
14
B
0
C
1
D
7
Show the answer
D · 7
A neutral solution, such as pure water, has a pH of 7.
Q6. What is the chemical formula of common salt?
Beginner
A
NaCl
B
CaCl₂
C
MgCl₂
D
KCl
Show the answer
A · NaCl
Common salt is sodium chloride, with the chemical formula NaCl.
Q7. Which of the following is a base?
Beginner
A
Vinegar
B
Soap
C
Curd
D
Lemon juice
Show the answer
B · Soap
Soap is basic in nature, while vinegar, lemon juice, and curd are acidic.
Q8. Acids taste sour.
Beginner
A
True
B
False
Show the answer
A · True
Acids have a sour taste, such as lemon juice and vinegar.
Q9. Bases turn blue litmus paper red.
Beginner
A
True
B
False
Show the answer
B · False
Bases turn red litmus paper blue. Acids turn blue litmus paper red.
Building up · 7 questions
Q10. Which of the following is an example of a strong acid?
Intermediate
A
Hydrochloric acid
B
Citric acid
C
Carbonic acid
D
Acetic acid
Show the answer
A · Hydrochloric acid
Hydrochloric acid (HCl) is a strong acid that completely ionizes in water. Acetic acid, citric acid, and carbonic acid are weak acids.
Q11. Which of the following is an example of a strong base?
Intermediate
A
Ammonium hydroxide
B
Magnesium hydroxide
C
Sodium hydroxide
D
Calcium carbonate
Show the answer
C · Sodium hydroxide
Sodium hydroxide (NaOH) is a strong base that completely dissociates in water. Ammonium hydroxide and magnesium hydroxide are weak bases.
Q12. What is formed when an acid reacts with a base?
Intermediate
A
Salt and oxygen gas
B
Salt and water
C
Water and carbon dioxide
D
Salt and hydrogen gas
Show the answer
B · Salt and water
The reaction between an acid and a base is called neutralization, which produces salt and water.
Q13. Which gas is produced when an acid reacts with a metal?
Intermediate
A
Carbon dioxide
B
Nitrogen
C
Oxygen
D
Hydrogen
Show the answer
D · Hydrogen
Acids react with metals to produce hydrogen gas, which burns with a pop sound.
Q14. Which of the following is a natural indicator?
Intermediate
A
Universal indicator
B
Methyl orange
C
Litmus
D
Phenolphthalein
Show the answer
C · Litmus
Litmus is a natural indicator extracted from lichens. Phenolphthalein and methyl orange are synthetic indicators.
Q15. What color does phenolphthalein turn in a basic solution?
Intermediate
A
Yellow
B
Blue
C
Colorless
D
Pink
Show the answer
D · Pink
Phenolphthalein is colorless in acidic and neutral solutions but turns pink in basic solutions.
Q16. Which of the following is a weak acid?
Intermediate
A
Acetic acid
B
Sulfuric acid
C
Nitric acid
D
Hydrochloric acid
Show the answer
A · Acetic acid
Acetic acid (CH₃COOH) is a weak acid that only partially ionizes in water. Hydrochloric, sulfuric, and nitric acids are strong acids.
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