Please select a subject first
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Gold plated ornaments is the example of ______.
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Give scientific reasons.
Silver amalgam is used for filling dental cavities.
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Explain the chemical reactions in rusting of iron.
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Complete the correlation:
Farsightedness : Convex lens : : Presbyopia : ______
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| A process of forming a thick oxide of aluminium when aluminium is exposed to air. This coat makes it resistant to corrosion. Resistance can be improved by making a layer of oxide thinker. In this technique, the aluminium article is the anode, and the electrolyte is sulphuric acid. The anode reaction results in the formation of a black-coloured film of aluminium oxide on the anode. By putting appropriate dyes in the electrolytic solution, both coloured surface with the decorative finish is achieved. Kitchen articles like anodised such as pressure cookers, pans and frames of sliding windows are applications of this technique. |
- Name the anode and electrolyte used in this technique.
- How can we make aluminium articles made resistant to corrosion?
- Name the technique used to coat the aluminium articles.
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What are the factors affecting the rate of chemical reaction?
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Explain any one factor affecting the rate of chemical reaction.
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In ______ process a layer of molten tin is deposited on metals.
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Corrosion can be prevented by using ……………. solution.
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Define ‘redox reaction’. Give one example.
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Given below is a diagram showing a defect of human eye. Study it and answer the following questions.
(i) Name the defect shown in the figure.
(ii) Give reason for this defect of eye in human being.
(iii) Name the type of lens used to correct the eye defect.
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Suggest measures to minimize electricity consumption at home.
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In a Std. X class out of 40 students 10 students use spectacles, 2 students have positive power and 8 students have negative power of lenses in their spectacles.
Answer the following questions:
(1) What does the negative power indicate?
(2) What does the positive power indicate?
(3) Generally which type of spectacles do most of the students use?
(4) What defect of eyesight do most of the students suffer from?
(5) Give two possible reasons for the above defect.
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The chemical formula for rust is.............. .
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Explain two possible reasons of myopia. How can it be corrected? Explain with a suitable diagram.
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Define corrosion.
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What is meant by rust?
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Write the chemical formula of rust.
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