Question

An example of a liquid metal is ______ and that of a liquid non-metal is _______.
A. Gallium, Mercury
B. Mercury, Chlorine
C. Mercury, Bromine
D. Bromine, Sulphur

Answer 1

Hint- In order to deal with this question first we will define the terms liquid metal, then we will proceed further by understanding the properties of given options and try to fulfill the blank with the correct option amongst the given one.

Complete answer:
Liquid metal is composed of alloys with very low melting points that form a liquid eutectic at room temperature.
Mercury: Mercury is the only metal at natural temperatures and pressure and is a vapor. Thanks to the valence electrons' behaviour, mercury has a small melting point, is an electrical and thermal conductor and does not form diatomic mercury molecules during the gas phase.
Bromine: Bromine has 35 electrons and with 7 electrons in its outer shell it has a valency of 1, so is very reactive. But, the electrons are very spread out from the atomic nucleus; hence it behaves like a liquid. It is non-metallic, because it is a liquid halogen gas at STP.
Hence, an example of a liquid metal is mercury and that of a liquid non-metal is bromine.

So, the correct answer is option C.

Note- Mercury can be used to make thermometers, barometers and other scientific instruments. Mercury conducts electricity, and is used to make switches dependent on position and silence. Mercury vapor is found in streetlights, commercial signage and fluorescent lamps. Bromine is used in many areas, including agricultural chemicals, dyestuffs, insecticides, pharmaceuticals, and intermediate chemicals. For environmental concerns, some applications are being phased out but new ones are yet to be identified. Bromine derivatives should be used as retardants against fires.