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Explain in short perception of colour.

While performing an experiment, a student observes that when he heats some green crystals in a boiling tube, the colour of the crystals changes to brown and a gas evolves which smells like burning sulphur . Interpret the observations and results.

In the Coolidage tube experiment, if the applied voltage is increased to three times, the short wavelength limit of continuous X- ray spectrum shift by 20 pm. What is the intial voltage (in kV) applied to the tube?

You want to perform an experiment to study a double displacement reaction in your school laboratory. Name two aqueous solutions required for the experiment. Stare the colour change you are likdy to observe on mix- ing the two solutions.