Q. What is the chemical formula for sodium bicarbonate?
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A.
NaCl
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B.
NaOH
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C.
NaHCO3
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D.
Na2CO3
Solution
The chemical formula for sodium bicarbonate is NaHCO3.
Correct Answer: C — NaHCO3
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Q. What is the chemical formula for sodium hydroxide? (2019)
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A.
NaCl
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B.
NaOH
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C.
Na2SO4
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D.
NaHCO3
Solution
The chemical formula for sodium hydroxide is NaOH.
Correct Answer: B — NaOH
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Q. What is the chemical formula for water?
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A.
H2O
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B.
CO2
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C.
O2
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D.
H2O2
Solution
The chemical formula for water is H2O.
Correct Answer: A — H2O
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Q. What is the effect of acids on litmus paper? (2021)
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A.
Turns blue to red
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B.
Turns red to blue
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C.
No effect
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D.
Turns yellow
Solution
Acids turn blue litmus paper red.
Correct Answer: A — Turns blue to red
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Q. What is the pH range of acidic solutions? (2023)
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A.
0-7
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B.
7-14
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C.
14-20
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D.
None of the above
Solution
Acidic solutions have a pH range of 0 to 7.
Correct Answer: A — 0-7
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Q. What is the pH value of a neutral solution? (2020)
Solution
A neutral solution has a pH value of 7, which is neither acidic nor basic.
Correct Answer: B — 7
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Q. What is the term for a substance that increases the concentration of hydrogen ions in a solution?
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A.
Base
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B.
Acid
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C.
Salt
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D.
Neutral
Solution
An acid increases the concentration of hydrogen ions in a solution.
Correct Answer: B — Acid
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Q. Which gas is produced when an acid reacts with a metal? (2022)
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A.
Oxygen
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B.
Hydrogen
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C.
Carbon dioxide
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D.
Nitrogen
Solution
Hydrogen gas is produced when an acid reacts with a metal.
Correct Answer: B — Hydrogen
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Q. Which of the following is a base? (2020)
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A.
HCl
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B.
NaOH
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C.
H2SO4
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D.
CH3COOH
Solution
Sodium hydroxide (NaOH) is a common example of a base.
Correct Answer: B — NaOH
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