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प्रश्न
Give reason.
A wooden article should be polished.
उत्तर
A wooden article should be polished because it protects the wooden article from sunlight and all other external conditions and also reduces the probability of wooden mites damaging the furniture.
संबंधित प्रश्न
Mention two uses of the following metals and non-metals
Iron
Answer the following question.
a) What is meant by corrosion?
b) Write names of any two methods of prevention of corrosion.
c) In which method, metal like copper, aluminium are coated with a thin layer of their oxides by means of electrolysis.
d) Explain this method with diagram.
Choose the correct alternative and rewrite the following:
Iron is _____________________.
Give a reason why rust turns moist red litmus blue.
Find the odd one out and give its explanation.
Draw a neat labelled diagram.
Electroplating
Give the equation for the formation of rust.
Which among the following alloys contain mercury as one of its constituents?
Explain the following:
Bubbles are produced when acetic acid is added to a solution of sodium hydrogencarbonate.
Describe two changes that are harmful. Explain why you consider them harmful. How can you prevent them?
