11. (a) Why should curd and sour substances not be kept in brass and copper vessels?
() While diluting an acid why is it recommended that the acid should be added to water and not water should be added in acid.
Answers
Question :-
Write the properties and uses of diamond.
Answer :-
Properties
1. Brilliant and pure diamond is the hardest natural substance.
2. The density of diamond is 3.5 g/cm³.
3. The melting point of diamond is 3500°C.
4. When diamond is heated at 800°C in the presence of Oxygen CO² is given away. In this process no other product besides CO² is formed.
5. Diamond does not dissolve in any solvent.
6. Acids/bases have no effect on diamond.
7. Diamond is a bad conductor of electricity and it does not have free electrons.
Uses
1. Diamonds are used in glass cutting and rock drilling machines.
2. Diamonds are used in ornaments.
3. Diamond knives are used in the eye surgery.
4. Diamond dust is used for polishing other diamonds.
5. Diamond is used to make windows giving protection from radiation in space and artificial satellites.
a) Both the Curd and sour substances are acids. Acids react with metals to produce salt and hydrogen gas. So, if such substances are kept in a copper container, the acid will react and the container will be corroded. Thereby may spoil or poison the food.
b) Dilution of concentrated acid is an exothermic process. If water is added to a concentrated acid, the heat generated may cause the mixture to splash out and cause burns. When the acid is added to water slowly with constant stirring, the mixture will not splash out.
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