The elements of sets A , B and C are all colours as follows:
A = { Red , Orange , Yellow , Brown } ,
B = { Blue , Yellow , Green , Brown } ,
C = { Black , Brown , White , Grey }
Then, A U B U C is
Which colour change is observed when dilute HCl is added to a beaker containing copper oxide?
Colour the map as follows: Park - Green, water tank- blue, Bus stand - brown, Liberary - orange, Fire station- red, post office- pink, Hospital- purple, School- yellow, Railway station- silver, lake- sky blue, river - sky blue. [4 MARKS]