Question
Being light and non-inflammable, ______ gas is used to blow balloons.
This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
Helium
Balloon Gas Properties Explained
The question asks for a gas that is both light and non-inflammable for blowing balloons. Let's analyze the options based on these properties:
Gas Properties Analysis
- Chlorine (Cl2): This gas is heavier than air and is toxic and reactive. It is not suitable for balloons.
- Neon (Ne): While inert, Neon is denser than air and not as light as Helium. It's primarily used in lighting.
- Oxygen (O2): This gas is essential for combustion, meaning it is inflammable and supports burning. It is not safe for filling balloons.
- Helium (He): This gas is significantly less dense than air, making it very light. It is also chemically inert and completely non-inflammable, making it the safest choice for balloons.
Conclusion on Balloon Gas
Based on the analysis, Helium is the only gas listed that meets both criteria: being light and non-inflammable. It is commonly used for filling party balloons and airships for safety reasons.
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