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Acids, bases and salts
Class 10 · Chemistry · 10 questions
Name: ____________________ Date: ____________
The pH of a neutral solution at 25 degrees C is:
- A 7
- B 1
- C 0
- D 14
Which of these is a strong acid?
- A Hydrochloric acid
- B Acetic acid
- C Carbonic acid
- D Citric acid
Litmus turns red in:
- A Neutral solutions
- B Bases
- C Acids
- D Salt solutions of strong bases
Acid + base gives:
- A Metal and acid
- B Only water
- C Salt and water
- D Salt and hydrogen
A solution has a pH of 3. It is:
- A Acidic
- B Basic
- C Neutral
- D A salt
A solution has [H+] = 1 x 10^-4 mol/dm3. What is its pH?
- A 10
- B 1
- C 4
- D -4
Which of these is a base?
- A Citric acid
- B Sodium hydroxide
- C Hydrochloric acid
- D Vinegar
Phenolphthalein is pink in:
- A Alkalis
- B Neutral solutions
- C Pure water
- D Acids
The pH of a strong base is about:
- A 7
- B 1 to 2
- C 13 to 14
- D 3 to 4
Common salt, NaCl, is formed from the reaction of:
- A H2SO4 and KOH
- B HCl and NaOH
- C CH3COOH and NaOH
- D HNO3 and KOH
Answer key
1. A, 2. A, 3. C, 4. C, 5. A, 6. C, 7. B, 8. A, 9. C, 10. B
Neutral solutions have pH 7.
Hydrochloric acid ionises completely in water.
Blue litmus turns red in acids.
This is neutralisation.
pH below 7 is acidic.
pH = -log(10^-4) = 4.
NaOH is a strong base.
It turns pink in basic solutions.
Strong alkalis have a high pH.
Hydrochloric acid with sodium hydroxide gives sodium chloride and water.