A shiny brown coloured element 'X' on heating in air becomes black in colour. Can you predict the element 'X' and the black coloured substance formed? How do you support your predictions?

A shiny brown coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.

The black coloured substance formed when copper is heated in presence of oxygen.

How can you prove that white light is a mixture of all colours ?

Brown coloured metal powder is changed into black colour on heating. That metal powder may be …………… powder.

How do you separate colour from a mixture of colours?

How do you appreciate the role of molecules in the atmosphere for the blue colour of the sky ?

Suppose that you have three resistance each of value 30Omega . How many resistor can you obtain by various combinations of these three resistors ? Draw diagrams in support of your predictions.

How do you draw a red flower using indicators to get the desired colour ?