Which of the following is a chemical property of acids? MCQ with Answer and Explanation

Question
Which of the following is a chemical property of acids?
A. Turn blue litmus red
B. Sour taste
C. Conduct electricity in solution
D. React with metals to produce hydrogen gas
Answer: Option D
Solution (By JKSSB Mock Tests)
Reacting with metals (e.g., Zn + 2HCl → ZnCl₂ + H₂) to produce hydrogen gas is a chemical property because new substances are formed. Sour taste is physical sensation, color change of litmus is an indicator of chemical reaction but is not itself a chemical property; reactivity is. Conductivity is physical. Chemical properties describe a substance's ability to undergo chemical change.
This question belongs to: Science chemistry
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Question #1
CNG is considered a cleaner fuel than diesel because:
A. It is a liquid
B. It is more expensive
C. It contains more carbon
D. It produces less CO₂ and negligible particulate matter
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Correct Answer: Option D

Explanation:
CNG (mainly methane) has a higher H/C ratio than diesel, so it emits less CO₂ per unit energy. It burns almost completely, producing very little carbon monoxide, unburnt hydrocarbons, and particulate matter (soot). It also contains negligible sulfur, thus no SO₂ emissions.
This question belongs to: Science chemistry
Question #2
Which of the following is considered the cleanest fuel?
A. Diesel
B. Coal
C. Hydrogen
D. Wood
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Correct Answer: Option C

Explanation:
Hydrogen is considered the cleanest fuel because its combustion produces only water (2H₂ + O₂ → 2H₂O) and no greenhouse gases or toxic pollutants. Coal, wood, and diesel produce CO₂, CO, SO₂, and particulate matter, contributing significantly to air pollution and global warming.
This question belongs to: Science chemistry
Question #3
During electroplating of an iron spoon with silver, the anode is:
A. Iron spoon
B. Silver rod
C. Graphite
D. Platinum
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Correct Answer: Option B

Explanation:
The silver rod dissolves (Ag → Ag⁺ + e⁻) at the anode, replenishing Ag⁺ in the electrolyte, which deposits on the iron spoon (cathode). Iron spoon remains intact.
This question belongs to: Science chemistry
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