Question

At room temperature liquid metals and liquid non metals are :
 $ \left( A \right)Hg $ and $ {I_2} $
 $ \left( B \right)Cs $ and $ C{l_2} $
 $ \left( C \right)Hg $ and $ B{r_2} $
 $ \left( D \right)Cd $ and $ S $

Answer 1

Hint : Metals are those which have properties like hardness , electric conductor ,ductility and malleability . Non- metals lack these qualities . We have to tell the metal and non metal which are liquid at room temperature. Now for solving this we first know the room temperature is equal to $ 298k $ .

Complete step by step answer
Room temperature is $ {25^ \circ }C $ or $ 298k $ . If we see options then caesium and cadmium both are solid at room temperature . So the options $ \left( b \right) $ and $ \left( d \right) $ both are not correct .
Now we know that iodine, which is a non-metal, is solid at room temperature , so the option $ \left( a \right) $ will not be correct .
 So the metal mercury and non metal bromine are liquid at room temperature, so the option $ \left( c \right) $ is correct .
Additional information: There are other elements present which are liquid melt in temperature slightly higher than room temperature .
Those elements are francium which is a radioactive substance which has a melting point $ 300K $ .
Caesium atomic number is $ 55 $ , which melts at $ 301.59K $ . It is very soft metal and reacts with water violently .
Gallium which is also a soft metal which melts at $ 303.5K $ , it can melt in the body temperature .
Gallium is used in laborers as it is considered less toxic .
Rubidium whose atomic number is $ 312.4K $ . It is a soft , silvery metal having melting point
It generally gets ignited and forms rubidium oxide .

Note :
Metal atoms lose their electrons to be a cation and non metal accept electrons and become anion . metal oxides are basic in nature and non metal forms acidic oxides . All metals are solid at room temperature except mercury.