LPG is domesticated with a strong-smelling compound to detect leaks. This compound is: MCQ with Answer and Explanation

LPG is domesticated with a strong-smelling compound to detect leaks. This compound is:
A. Ethanol
B. Methanol
C. Thioethanol
D. Chloroform
Answer: Option C
Solution (By JKSSB Mock Tests)
LPG (Liquefied Petroleum Gas) is naturally odorless. To detect dangerous leaks, a strong-smelling sulfur compound called ethyl mercaptan (thioethanol, C2H5SH) is added to it. Its pungent, rotting-cabbage-like smell is easily detectable by the human nose even at very low concentrations.

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Question #1
A solution turns phenolphthalein pink. Which of the following could it be?
A. Soap solution
B. Vinegar
C. Hydrochloric acid
D. Lemon juice

Correct Answer: Option A


Explanation:
Soap solution is basic, pH > 8.3, so it turns phenolphthalein pink. Lemon juice (citric acid) and vinegar (acetic acid) are acidic, pH < 7, phenolphthalein remains colorless. Hydrochloric acid is strongly acidic, colorless. Phenolphthalein indicator is colorless in acidic and neutral, pink in alkaline solutions. It is used in titrations.

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Question #2
The valency of oxygen in H₂O is:
A. 1
B. 4
C. 2
D. 6

Correct Answer: Option C


Explanation:
Oxygen (atomic number 8) has electronic configuration 2,6. It needs 2 more electrons to complete its octet. In water (H₂O), it shares two electrons (one each with two hydrogen atoms), forming two covalent bonds. Hence valency = 2. Oxidation number is -2.

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Question #3
Global warming is mainly caused by increase in atmospheric:
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Correct Answer: Option B


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CO₂ levels have risen due to burning fossil fuels, enhancing greenhouse effect. Methane, N₂O also contribute. Nitrogen and oxygen are not greenhouse gases.

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