Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Which of the following elements is a liquid at room temperature?
Gallium
Bromine
Mercury
Both B and C
Both B and C
At standard room temperature (approximately 298 K), both Mercury (Hg) and Bromine (Br2тАЛ) exist in the liquid state. Mercury is the only metallic element that is liquid at this temperature, while Bromine is the only non-metallic element that is liquid at this temperature.
At standard room temperature (approximately 298 K), both Mercury (Hg) and Bromine (Br2тАЛ) exist in the liquid state. Mercury is the only metallic element that is liquid at this temperature, while Bromine is the only non-metallic element that is liquid at this temperature.
Think of Mercury like a heavy, metallic liquid metal in a thermometer, and Bromine like a dark red, pungent liquid that is always trying to escape into a gaseous vapor state.
MB: 'Mercury and Bromine are Meltingly Basic' (in room temp context).
TmeltтАЛ(Hg)тЙИ234.32┬аK тАФ Melting point of Mercury
TmeltтАЛ(Br2тАЛ)тЙИ265.8┬аK тАФ Melting point of Bromine
The state of an element depends on the strength of intermolecular or interatomic forces. For Mercury, the relativistic effects in its 6s orbitals lead to weak metallic bonding, lowering its melting point to 234.32 K. For Bromine, the van der Waals forces between Br2тАЛ molecules are just strong enough to hold them together at room temperature, but weak enough that it transitions to a gas easily.
Mercury (Hg) is a transition metal with atomic number 80.
Bromine (Br2тАЛ) is a halogen with atomic number 35.
Gallium is a solid at room temperature but has a very low melting point of 302.91 K (29.76 ┬░C), meaning it melts in the palm of a human hand.
Standard room temperature is internationally defined as 25 ┬░C or 298.15 K.
Mercury's liquid state is highly useful for barometers and thermometers due to its high thermal expansion coefficient.
Mercury is highly toxic and its vapor can cause neurological damage.
Bromine is highly corrosive and causes severe skin burns.
Mercury: Thermometers, barometers, and electrical switches.
Bromine: Used in flame retardants, water purification, and photographic chemicals.
Gallium melts at 29.76 ┬░C, which is slightly above the standard room temperature of 25 ┬░C.
Cesium (Cs) and Francium (Fr) also have melting points very close to room temperature (Cesium is 28.4 ┬░C).
D is correct тАФ Both Mercury and Bromine are standard elements that remain in the liquid phase at 25 ┬░C.
Always double-check if the question refers to 'standard room temperature' (25 ┬░C) or a slightly warmer environment, as Gallium is a 'near-room-temperature' liquid metal.
Get instant step-by-step AI explanations, full shift Previous Year Papers (SSC GD, RRB, SSC JE), and regional rank analysis on the official Examoogle App.
Free Download тАв 100K+ Aspirants