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Which of the following statements is INCORRECT regarding metals?
Metals are good conductors of heat.
Metals have to be drawn into thin wires.
Lead and mercury are comparatively good conductors of heat.
Metals, in their pure state, have a shining surface.
Lead and mercury are comparatively good conductors of heat.
Lead and mercury are considered poor conductors of heat compared to most other metals. While all metals conduct heat, these two exhibit significantly lower thermal conductivity due to their unique atomic packing and electronic structure.
Lead and mercury are considered poor conductors of heat compared to most other metals. While all metals conduct heat, these two exhibit significantly lower thermal conductivity due to their unique atomic packing and electronic structure.
Think of heat conduction like a crowded corridor of people passing a ball; most metals are like organized students in a line, while lead and mercury are like a disorganized crowd where moving the ball becomes much slower.
Q=kAd╬ФTтАЛ тАФ where Q is heat transfer rate, k is thermal conductivity, A is area, and d is thickness.
Thermal conductivity in metals is primarily facilitated by free electrons moving through the lattice. In mercury, which is liquid at room temperature, and lead, which has high atomic mass and specific phonon scattering properties, the efficiency of this heat transfer is exceptionally low compared to metals like silver or copper.
Most metals are excellent conductors of heat and electricity.
Silver and copper are the best conductors among metals.
Mercury is the only metal that exists in a liquid state at room temperature.
Lead has the lowest thermal conductivity among common stable metals.
Use of copper in electrical wiring due to high conductivity.
Use of mercury in thermometers (though strictly limited now due to toxicity).
Thermal conductivity (k) of Silver is approx 429┬аW/mK, whereas Mercury is approx 8.3┬аW/mK.
Option B refers to 'Ductility', the property allowing metals to be drawn into wires.
C is correct тАФ Lead and mercury are classified as poor conductors of heat in comparison to most other metals.
Always remember exceptions in periodic table trends: Mercury and Lead are the classic 'exceptions' when discussing metallic conduction properties in competitive exams.
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