Find the odd chemical item (state at room temperature): Select the metal that is liquid at room temperature.
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AIron
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BMercury
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CSilver
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DGold
Answer
Correct Answer: Mercury
Explanation
Introduction / Context:Elements can be classified by state of matter at standard conditions. Most metals are solid at room temperature; mercury is famously liquid, making it an immediate outlier.
Given Data / Assumptions:
- Iron: solid metal at room temperature.
- Silver: solid metal at room temperature.
- Gold: solid metal at room temperature.
- Mercury: liquid metal at room temperature.
Concept / Approach:Compare physical state under standard conditions (approximately 25°C, 1 atm). Mercury’s unique liquidity among common metals distinguishes it categorically.
Step-by-Step Solution:
1) Tag Fe/Ag/Au as solid.2) Tag Hg as liquid.3) The only liquid metal present is Mercury.Verification / Alternative check:Check melting points: Hg has a melting point well below room temperature, whereas Fe/Ag/Au melt far above it.
Why Other Options Are Wrong:They share the “solid at room temperature” property.
Common Pitfalls:Do not confuse “conductivity” (all conduct well) with state of matter; here the state is decisive.
Final Answer:Mercury