What happens when HCl is added to Zn granules?
Name the reaction which takes place when ferrous sulphate is heated?
In addition to Sodium hydrogen carbonate, baking powder contains a substance 'X'. Nam
the substance X
What are the special features of a heating wire?
What is light?
What do you understand by spectrum of white light?
Explain the cause of dispersion of white light when passes through a glass prism.
Draw a labelled diagram to illustrate the recombination of the spectrum of white light,
Refer to the figure, which two positions correspond closely to
the colour of
(a) brinjal
(b) 'danger' or stop signal lights?
Answers
Answer:
1. Displacement reaction takes place as we know Acid + Metal ------->Salt + H2 HCL +Zn -------> ZnCl + H2
2. A decomposition reaction takes place, FeSO4 ----heat----> Fe2O3 + SO2 + SO3
3. Baking powder contains NaHCO3 and some mild edible acid like tartaric acid. X is tartaric acid.
4. A heating wire has a very high resistance and a high melting point as it has convert the electrical energy into light and heat energy.
5. Light is a form of energy.
6. A spectrum of white light is a bend of seven colours that the white light splits into due to refraction.
7. White light consists of seven colours of different wavelengths and frequencies. During refraction each colour light bends at different angles of refraction causing dispersion.
9. a.violet b.red
hope this is helpful:)