When some metals are exposed to moisture, acids, etc. they tarnish due to formation of respective metal oxide on their surface. This process is called
A) reduction
B) combustion
C) corrosion
D) rancidity
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__________ is the part of the overall legal system that deals with the Internet, cyberspace, and their respective legal issues.
Correct Answer is Cyberlaw
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__________ is the part of the overall legal system that deals with the Internet, cyberspace, and their respective legal issues.
(A) Cyber Law
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If the surface of the liquid exposed to air the evaporation process takes place up to ………………….
A) full quantity of liquid evaporates
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If the surface of the liquid exposed to air the evaporation process takes place up to ………………….
2 Answers
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Some symbols of elements are based on their English names. Some other are based on their Latin names.
A) (i) and (iii)
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Vidhya and Vijay were studying the effect of certain radiations on flower plants. Vidhya exposed her plants to UV rays and Vijay exposed his plants
Frequency of UV rays is greater than infrared rays, hence UV rays are much more energetic than infrared rays. Plants cannot tolerate the exposure of high energy rays. As a...
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How can we predict chemical reactivity of elements based on their oxide formation reactions and the nature of oxides formed?
The chemical reactivity can be illustrated by comparing the reaction of elements with oxygen to form oxides and the nature of the oxides. Alkali metals present on the extreme left of the...
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1. (a) Is ammonia more dense or less dense than air? (b) What property of ammonia is demonstrated by the Fountain Experiment? (c) Write the balanced equation for the reaction between ammonia and sulphuric acid. 2. Pick the odd member from the list giving reasons: (a) Ammonia, sulphur dioxide, hydrogen chloride, carbon dioxide. (b) Copper oxide, aluminium oxide, sodium oxide, magnesium oxide. 3. Give reasons for the following : (a) Liquid ammonia is used as a refrigerant in ice plants. (b) Aqueous solution of ammonia is used for removing grease stains from woollen clothes. (c) Aqueous solution of ammonia gives a pungent smell. (d) Aqueous solution of ammonia conducts electricity.
(1) (a) ammonia is less dense than air (b) solubility in water (c) 2NH3 + H2SO4 → (NH4)2SO4 (2) (a) Ammonia → because - NH3 is basic while, SO2,HCl and CO2 are acidic oxides. (b) CuO,...
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Certain plants flower only when they are exposed to low temperature for a few weeks . What do you call for this requirement?
Vernalisation
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A simole oxide of carbon and that another non-metal have the same Cp/Cv ratio but a difference of 2 in their molecular weights. The other non-metal co
`N_2` is less reactive at room temperature due to presence of triple bond between two N atoms `NcongN` Hence bond Dissociation energy `N_2` is bery high.
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