LPG has an added odorant (ethyl mercaptan) to: MCQ with Answer and Explanation

Question
LPG has an added odorant (ethyl mercaptan) to:
A. Improve engine performance
B. Increase calorific value
C. Detect leakage
D. Reduce combustion temperature
Answer: Option C
Solution (By JKSSB Mock Tests)
LPG (propane/butane) is odorless. A small amount of strong-smelling mercaptan (ethanethiol) is added to help detect gas leaks, preventing accidents. Natural gas also has odorant. Mercaptans contain sulfur, and their smell is detectable at very low concentrations. Calorific value, temperature, performance are unaffected. Safety is primary.
This question belongs to: Science chemistry
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Practice More chemistry Questions

Question #1
The substance that increases the efficiency of a catalyst is called a:
A. Reactant
B. Inhibitor
C. Promoter
D. Poison
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Correct Answer: Option C

Explanation:
A promoter is a substance that, when added in small quantities, enhances the activity or efficiency of a catalyst. For example, in the Haber process, molybdenum acts as a promoter for the iron catalyst. An inhibitor or poison decreases catalyst activity by blocking active sites.
This question belongs to: Science chemistry
Question #2
Sodium hydroxide (caustic soda) is manufactured by:
A. Haber process
B. Ostwald process
C. Contact process
D. Chlor-alkali process
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Correct Answer: Option D

Explanation:
The chlor-alkali process electrolyzes concentrated NaCl solution (brine) to produce NaOH, Cl₂, and H₂. 2NaCl + 2H₂O → 2NaOH + Cl₂ + H₂. The mercury, diaphragm, or membrane cell can be used. Contact process is for H₂SO₄, Haber for NH₃, Ostwald for HNO₃.
This question belongs to: Science chemistry
Question #3
Which salt is formed when hydrochloric acid reacts with sodium hydroxide?
A. Sodium carbonate
B. Sodium sulfate
C. Sodium nitrate
D. Sodium chloride
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Correct Answer: Option D

Explanation:
HCl + NaOH → NaCl + H₂O. This is a neutralization reaction producing sodium chloride (common salt). NaNO₃ from HNO₃, Na₂SO₄ from H₂SO₄, Na₂CO₃ from H₂CO₃ (weak acid).
This question belongs to: Science chemistry
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