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Which term is used to indicate the devel...

Which term is used to indicate the development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation (when they are kept exposed for a considerable time) ?

A

acidity

B

radioactivity

C

rabidity

D

rancidity

Text Solution

Verified by Experts

The correct Answer is:
D
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Rahul is a ten year old boy. He had purchased a packet of potato chips more than a month ago. Rahul opened the packet at the time but could eat only some of the potato chips from it. He then kept the open packet containing remaining potato chips on his book rack. He wanted to eat the remaining potato chips today. Just when Rahul was about to put these potato chips into his mouth, his elder sister Pavni, who is a student of class X entered the room. She found that these potato chips were giving unpleasant smell. When she put one potato chip in her mouth, it hat so unpleasant taste. Pavni took away the packet from Rahul and did not allow him to eat these potato chips. She threw away the potato chips into a dustibin. (a) What is given to the condition in which potato chips kept open for a considerable time give out unpleasant smell and taste? (b) Which chemical reaction is responsible for the soilage of potato chips kept exposed by Rahul for a considerable time? (c) What produces the unpleasant smell as well as unpleasant taste in potato chips? Explain. (d) With which gas the plastic bags containing potato chips are filled and then sealed by manufactures? How does it help? (e) What values are displayed by Pavni in this episode?

Name two anti-oxidants which are usually added to fat and oil containing foods to prevent rancidity.

What is the general name of the chemicals which are added to fat and oil containing foods to prevent the development of rancidity?

Explain the term racidity. Write any two methods to prevent ( or retard) the development of rancidity in fat and oil containing foods. Name another damaging effect caused by the same natural process which produces rancidity.

Which of the following cannot be used to prevent food containing fats and oils from becoming rancid?

When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation fo a layer of substance B. when an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity. (a) What is metal A? (b) What is metal C? (c) name the substance B. (d) name the substance D. (e) What type of chemcial can be used to remove the green layer from metal C and clean it? Why?

Raghav is a student of class X who was trying to convert the groundnut oil into solid fat (vanaspati ghee). He took the oil inan appropriate flask having an arrangement for passing hydrogen gas into it. Raghav pased the hydrogen gas into oil and heated them together for a considerable time. On cooling the apparatus, Raghav found that even after heating them together for a considerable time. On cooling the apparatus, Raghav found that even after heating together oil and hydrogen for a considerable time, no solid fat was formed. Raghav shard this problem with his sister Divya who is studyging in class XI. She advised him ot add a certain finely divided substance while heating oil wih hydrogen gas. When Raghav repeated the experiment by adding this substance to oil and hydrogen mixture, then the liquid oil was converted into a solid fat.Divya advised Raghav not to consume the fat prepared by him in the laboratory. (a) What was he finely divided substance which Raghav was asked to add for converting oil into fat? What is its function? (b) What type of substance is (i) an oil, and (ii) a fat? (c) What is the special name of conversion of oils into fats used in Industry? (d) What are the two types of chemical reactions exemplified by the conversion of oils into fats? (e) Why did Divya ask Raghav not to consume the fat prepared by him in the laboratory? (f) What values are exhibited by Divya in this episode?

LAKHMIR SINGH & MANJIT KAUR-CHEMICAL REACTIONS AND EQUATIONS -Exercise
  1. In the context of redox reactions, the removal of hydrogen from a subs...

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  2. The chemical reaction involved in the corrosion of iron metal is that ...

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  3. Which term is used to indicate the development of unpleasant smell and...

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  4. In order to prevent the spoilage of potato chips, they are packed in p...

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  5. A white precipitate can be obtained by adding dilute sulphuric acid to...

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  6. A white precipitate will be formed if we add common salt solution to :

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  7. Consider the following equation of the chemical reaction of a metal M ...

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  8. The process of respiration is:

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  9. Which of the following can be decompose by the action of light?

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  10. Consider the reaction: KBr(aq)+AgNO(3)(aq)toKNO(3)(aq)+AgBr(s) Th...

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  11. You are given the following chemical equation : Mg(s) + CuO(s) to Mg...

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  12. When a green iron salt is heated strongly , its colour finally changes...

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  13. A colourless lead salt, when heated , produces a yellow residue and br...

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  14. When hydrogen burns is oxygen, water is formed and when water is ele...

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  15. A strip of metal X is dipped in the blue coloured salt solution YSO(4...

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  16. When a black metal compound XO is heated with a colourless gas Y(2) , ...

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  17. A metal X forms a water-soluble seat XNO(3) When an aqueous solution o...

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  18. Two metals X and Y form the salts XSO(4) and Y(2)SO(4) respectively.Th...

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  19. A red-brown metal X forms a salt XSO(4) . When hydrogen sulphide gas i...

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  20. When a strip of red-brown metal X is placed in a colourless salt solut...

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