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Question

What element is a greenish yellow gas with a characteristic smell at room temperature?

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
Chlorine

Element Properties: Greenish Yellow Gas

This question requires identifying an element based on its described properties at room temperature: being a gas, having a greenish-yellow color, and possessing a specific smell.

Analyzing Element Characteristics

  • State: The element is a gas.
  • Color: The gas is greenish-yellow.
  • Smell: It has a characteristic odor.
  • Condition: These properties are observed at room temperature.

Matching Properties to Elements

Let's evaluate the options based on these properties:

  • Chlorine (Cl): This element is indeed a greenish-yellow gas at standard temperature and pressure, known for its pungent, characteristic smell.
  • Carbon monoxide (CO): This is a colorless and odorless gas.
  • Iodine (I): This element is a solid at room temperature, although it can sublime into a purple vapor.
  • Hydrogen sulphide (H2S): This is a colorless gas, famous for its strong smell of rotten eggs.

Chlorine perfectly matches the description provided in the question.

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