Question

An element which becomes liquid slightly above the room temperature is :-
(a)Caesium
(b)Mercury
(c)Bromine​

Answer 1

Answer:

The only liquid elements at standard temperature and pressure are bromine (Br) and mercury (Hg). Although, elements like caesium, rubidium, francium and gallium become liquid at or just above the room temperature. Bromine is a non metal while mercury is a metal.

Explanation:

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Answer 2

Answer:

Caesium becomes liquid slightly above the room temperature.

Explanation:

• Caesium is a metal, its atomic number 55 is and atomic mass is 132 u. It is represented by the symbol Cs. It is an alkali metal, silvery golden in colour and soft in nature, The melting point of caesium is 28.5 °C.

• Caesium is used widely as a drilling fluid. It is also used as a catalyst promoter , in optical glass and vacuum tubes. It is also used in atomic clocks (caesium clocks). Having a low melting point, caesium turns into liquid at just above the room temperature (25 °C).

So, from above explanation it is clear that correct option is A :Caesium.