1
5. Write scientific reasons.
a. Lemon or tamarind is used for
cleaning copper
vessels turned
greenish.
b. Generally the ionic compounds have
high melting points.
S. Sodium is always kept in kerosene.
d. Pine oil is used in froth flotation.
e. Anodes need to be replaced from time
to time during the electrolysis of
alumina.
Answers
Answer:
a) Lemon and tamarind contain citric and tartaric acid respectively which react with the metal and make it shining.
b)ionic compounds have strong inter molecular attraction among particles which makes these compounds stronger. So a lot of energy is required to break this bond. Therefore it has high melting point.
c) Sodium is a highly reactive metal which vigorously react with oxygen or water to produce heat.So it is kept in kerosene to break the contact with air and moisture.
d)Pine oil attracts the impurities from the ore so it is used in froath floating
e)The anodes get oxidized and it is made of carbon.So it should be replaced during electrolysis of alumina.
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Answer:
a) we use lemon or tamarind as they are acidic , they neutralize the basic copper oxide
b) ionic compounds are formed by exchange of ions, the force of attraction between anion and cation are high, therefore large amount of energy is needed to break the bond, resulting in high melting point.
c) sodium is a very reactive metal, if kept in air, an highly exothermic reaction occurs which results in sodium metal catching fire
d) pine oil does not have affinity for water, therefore it can attract the impurities for their removal
e) during the process of electrolysis the anodes get oxidized, finally leading to corrosion of anode, therefore they must be replaced regularly
Explanation:
a) copper reacts with oxygen to produce CuO which is basic in nature(metal oxides are basic in nature)
e) during electrolysis , the alumina get deposited downwards, resulting in a reaction between oxygen and anode