Name:
(i) A greenish yellow gas with pungent smell.
(ii)An oxide which is yellow when hot and white when cold.
(iii) A chemical used to deplete ozone layer.
(iv)A crystalline salt without water of crystallization.
Answers
Ans i) Chlorine is a greenish yellow gas with pungent smell.
Ans ii)Zinc oxide is an example of Non Stoichiometric defect under the category metal excess defect (excess cations occupying the interstitial site). Zinc oxide is white in color but on heating it turns into yellow because on heating it loses oxygen reversibly at high temperature.
Ans iii) Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. The total amount of effective halogens (chlorine and bromine) in the stratosphere can be calculated and are known as the equivalent effective stratospheric chlorine (EESC).
Ans iv) Potassium nitrate, Barium sulphate,Potassium chloride,Sodium nitrate etc. are the salts that do not contain water of crystallization.
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Answer:(I) Chlorine
(ii) Zinc oxide
(iii) Cloroflourocarbons.
(CFCs)
(iv) Potassium nitrate
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