What is meant by rancidity of oils?

What is meant by rancidity of oils?
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1 Answer

Answer :

Rancidity is the process which causes a substance to become rancid, that is, having

unpleasant smell or taste.
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Related questions

The main cause of rancidity in of fats and foods is the oils - (1) hydrolysis (2) oxidation (3) clarification (4) reduction

Description : The main cause of rancidity in of fats and foods is the oils - (1) hydrolysis (2) oxidation (3) clarification (4) reduction

Last Answer : (2) oxidation Explanation: Rancidity in foods is due to the complete or incomplete oxidation or hydrolysis of fats and oils when exposed to air light, moisture or by bacterial action, resulting in unpleasant taste and odor.

“Rancidity produced in butter can be decreased by adding quinoline to the butter”. This statements shows that --------? A. Nothing is impossible B. Quinoline is an inhibitor (Answer) C. Quinoline is a catalyst D. Quinoline is an activator

Description : “Rancidity produced in butter can be decreased by adding quinoline to the butter”. This statements shows that --------? A. Nothing is impossible B. Quinoline is an inhibitor (Answer) C. Quinoline is a catalyst D. Quinoline is an activator

Last Answer : B. Quinoline is an inhibitor (Answer)

What is RANCIDITY ?

Description : What is RANCIDITY ?

Last Answer : RANCIDITY:  When left over edible oil is heated, it starts frothing up and its smell turns foul.  If food is cooked in this oil. Due to oxidation of oil, its taste changes.  When oil ... long time, they become rancid.  Antioxidants are used to prevent oxidation of food containing fats and oils.

(a) Explain two ways by which food industries prevent rancidity. (b) Discuss the importance of decomposition reaction in metal industry with three points. -Chemistry

Description : (a) Explain two ways by which food industries prevent rancidity. (b) Discuss the importance of decomposition reaction in metal industry with three points. -Chemistry

Last Answer : Answer. (a) (i) Rancidity can be prevented by adding antioxidants to food containing fat and oil, e.g. butylated hydroxy anisole is added to butter as antioxidant. (ii) It can be prevented ... cryolite. (iii) Carbonate ores are thermally decomposed to give metal oxide which on reduction give metal.

Rancidity of butter is prevented by the addition of (A) Vitamin D (B) Tocopherols (C) Presence of priotin (D) Presence of ‘Cu’ FATS AND FATTY ACID METABOLISM 97

Description : Rancidity of butter is prevented by the addition of (A) Vitamin D (B) Tocopherols (C) Presence of priotin (D) Presence of ‘Cu’ FATS AND FATTY ACID METABOLISM 97

Last Answer : Answer : B

Deterioration of food (rancidity) is due to presence of (A) Cholesterol (B) Vitamin E (C) Peroxidation of lipids (D) Phenolic compounds

Description : Deterioration of food (rancidity) is due to presence of (A) Cholesterol (B) Vitamin E (C) Peroxidation of lipids (D) Phenolic compounds

Last Answer : Answer : C

Unpleasant odours and taste in a fat (rancidity) can be delayed or prevented by the addition of (A) Lead (B) Copper (C) Tocopherol (D) Ergosterol

Description : Unpleasant odours and taste in a fat (rancidity) can be delayed or prevented by the addition of (A) Lead (B) Copper (C) Tocopherol (D) Ergosterol

Last Answer : Answer : C

Value, used to assess the degree of spoilage (rancidity) of a fat or oil

Description : Value, used to assess the degree of spoilage (rancidity) of a fat or oil

Last Answer : Ans. Acid Number/Value

The method of protecting iron from rusting, by coating a thin layer of Zinc is called - (1) Galvanizing (2) rancidity (3) Alloy (4) Pulverizing

Description : The method of protecting iron from rusting, by coating a thin layer of Zinc is called - (1) Galvanizing (2) rancidity (3) Alloy (4) Pulverizing

Last Answer : (1) Galvanizing Explanation: Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting.

Rancidity in sunflower oil is due to — reaction. a. Reduction b. Oxidation c. Both a & b d. None of these

Description : Rancidity in sunflower oil is due to — reaction. a. Reduction b. Oxidation c. Both a & b d. None of these

Last Answer : b. Oxidation

Rancidity of the fatty oil can be reduced by its (A) Decoloration (B) Hydrogenation (C) Oxidation (D) Purification

Description : Rancidity of the fatty oil can be reduced by its (A) Decoloration (B) Hydrogenation (C) Oxidation (D) Purification

Last Answer : (B) Hydrogenation

What is meant by hydrogenation of oils?

Description : What is meant by hydrogenation of oils?

Last Answer : The process of converting liquid oils into solids saturated fats by passing hydrogen gas through them is called hydrogenation of oils. Finely divided nickel is used as catalyst during the process. Ex: Vanaspathi

Consider the following statements: 1. Mercury metal exists as a liquid at room temperature. 2. The property of metals by which they can be beaten into thin sheets is called malleability 3. Neutral fats such as butter and vegetable oils are mostly triglycerides. 4. The size of an atom is of the order of 10 - 15 m. The correct statements are: (a) 1, 2 and 4 only (b) 1, 3 and 4 only (c) 2, 3 and 4 only (d) 1, 2 and 3 only

Description : Consider the following statements: 1. Mercury metal exists as a liquid at room temperature. 2. The property of metals by which they can be beaten into thin sheets is called malleability 3. Neutral fats such as butter and vegetable oils ... b) 1, 3 and 4 only (c) 2, 3 and 4 only (d) 1, 2 and 3 only

Last Answer : Ans:(d)

Oils and fats are obtained from (a) Animal sources (b) Vegetable sources (c) Synthesis (d) Both animal and vegetable sources

Description : Oils and fats are obtained from (a) Animal sources (b) Vegetable sources (c) Synthesis (d) Both animal and vegetable sources

Last Answer : Ans:(d)

Oils and fats are (a) Glyceryl esters of higher fatty acids (b) Acetyl esters of higher fatty acids (c) Ethyl esters of fatty acids (d) Methyl esters of fatty acids

Description : Oils and fats are (a) Glyceryl esters of higher fatty acids (b) Acetyl esters of higher fatty acids (c) Ethyl esters of fatty acids (d) Methyl esters of fatty acids

Last Answer : Ans:(a)

The metal that is used as a catalyst in the hydrogenation of oils is (a) Ni (b) Pb (c) Cu (d) Pt

Description : The metal that is used as a catalyst in the hydrogenation of oils is (a) Ni (b) Pb (c) Cu (d) Pt

Last Answer : Ans:(a)

A fractionating column is a glass apparatus used to (a) Separate magnetic solids from nonmagnetic solids (b) Separate a mixture in water (c) Separate two or more liquids (d) Extract oils from vegetable matter

Description : A fractionating column is a glass apparatus used to (a) Separate magnetic solids from nonmagnetic solids (b) Separate a mixture in water (c) Separate two or more liquids (d) Extract oils from vegetable matter

Last Answer : Ans:(c)

Exposure to sunshine and diet rich in fish liver oils, oatmeal and sweet potatoes will not cause the deficiency disease 1. Osteomalacia 2. Osteoporosis and frequent bone fractures 3. Rickets 4. Fatty liver (a) 1, 2 (b) 1, 2, 3 (c) 1, 3 (d) 1, 2, 3, 4

Description : Exposure to sunshine and diet rich in fish liver oils, oatmeal and sweet potatoes will not cause the deficiency disease 1. Osteomalacia 2. Osteoporosis and frequent bone fractures 3. Rickets 4. Fatty liver (a) 1, 2 (b) 1, 2, 3 (c) 1, 3 (d) 1, 2, 3, 4

Last Answer : Ans:(b)

The metal that is used as a catalyst in the hydrogenation of oils is?

Description : The metal that is used as a catalyst in the hydrogenation of oils is?

Last Answer : Ni

The process of neutralizing the fatty acids present in the oils or fats by adding sodium

Description : The process of neutralizing the fatty acids present in the oils or fats by adding sodium

Last Answer : hydroxide is called saponification.

The process in which oils undergo oxidation and produce a foul smell is called

Description : The process in which oils undergo oxidation and produce a foul smell is called

Last Answer : rancidity.

Oils are unsaturated and

Description : Oils are unsaturated and

Last Answer : liquids at room temperature.

Give reason: Hydrocarbon oils are not oils.

Description : Give reason: Hydrocarbon oils are not oils.

Last Answer : As they do not contain fatty acids.

Mention the importance of fats and oils?

Description : Mention the importance of fats and oils?

Last Answer : a) Fats and oils are sources of food in which vitamin A, D, E & K are soluble. b) It is also a source of light for tribal people. c) Eskimos use animal fat as a source of light in their igloos. d) It is also used as a source of heat.

Give reason: Hydrogenated Oils are often used in frying and pastries.

Description : Give reason: Hydrogenated Oils are often used in frying and pastries.

Last Answer : Hydrogenated oils have a higher melting point. Hence it is used for frying and pastries.

Oils have short shelf life.

Description : Oils have short shelf life.

Last Answer : Unsaturated oils have short shelf life because they undergo oxidation in air and produce a foul smell.

a) Oils are easy to digest.

Description : a) Oils are easy to digest.

Last Answer : Unsaturated oils are easy to digest because they are chemically reactive.

Mention the differences between fats and oils.

Description : Mention the differences between fats and oils.

Last Answer : Fats Fats are mostly saturated Oils Oils are mostly unsaturated They are solids at room temperature They are liquids at room temperature They are chemically inactive They are chemically reactive They ... slowly It is easy to transport They are digested fast It is difficult to transport

How are fats and oils formed?

Description : How are fats and oils formed?

Last Answer : When fatty acids react with glycerol, fats and oils are formed. Fatty acid + Glycerol Esterification Fat/oil + Water

Which acid is contained in vegetable oils?

Description : Which acid is contained in vegetable oils?

Last Answer : Stearic acid

Name two vegetable oils which are used as medicine:?

Description : Name two vegetable oils which are used  as medicine:?

Last Answer : Caster oil; Mustard oil

Will borax dissolve in oils?

Description : Will borax dissolve in oils?

Last Answer : No, I don’t think so, since it is a sodium (salt) compound.

Should "essential oil" makers not make their oils homeopathic, to really crank up their effectiveness?

Description : Should "essential oil" makers not make their oils homeopathic, to really crank up their effectiveness?

Last Answer : At least essential oils have a use as air freshener and mood lifter. Some may be marginally effective as insect repellent. I'm guessing to be a true bullshit homeopathic dilution it has to ... auras. *Only true for unrefined, organic snake oil from snakes that have been fed undomesticated mice.

What are essential oils and how can they be useful?

Description : What are essential oils and how can they be useful?

Last Answer : I have only heard this in relation to perfume and scents. Soap makers, or perfume makers, buy various essential oils and mix them in different ways to make their own scented products. That;s big ... There are probably other meanings for essential oils', but this is the one I am familiar with.

Has anyone used essential oils on their body?

Description : Has anyone used essential oils on their body?

Last Answer : I use essential oils for a hunch of things, I make up balms and washes. There are a number of sites that can give you good tips and various recipes for balms and lotions for what you need. It ... but I do make a mildly astringent wash for minor scrapes and wounds with tea tree oil and witch hazel.

Have you tried essential oils and do they really work?

Description : Have you tried essential oils and do they really work?

Last Answer : answer:Essential oils IMHO are a slippery form of aroma therapy. I blend my own body oils for body and hair that I use at bedtime or after bath and there are specific fragrances that I do believe ... you can wake up your skin and feel energized. How you employ them makes all the difference.

Which essential oils are used for what ailments?

Description : Which essential oils are used for what ailments?

Last Answer : Here is a video I’ve found very helpful in my use of essential oils.

What are the kinds of oils to fry with, and never to fry with?

Description : What are the kinds of oils to fry with, and never to fry with?

Last Answer : both Gordon Ramsay and Jamie Oliver and Gennaro Contaldo always fry with olive oil in their videos. Never use motor oil though.

What's the best way to remove coffee odors and oils from a spice mill?

Description : What's the best way to remove coffee odors and oils from a spice mill?

Last Answer : Try grinding rice.

Are fish oils and biotin proven supplements?

Description : Are fish oils and biotin proven supplements?

Last Answer : Look them both up on www.webmd.com . Yes they are!

How can I make my own infused cooking oils?

Description : How can I make my own infused cooking oils?

Last Answer : answer:That was easy Even better

Is there a quick and easy way to extract essential oils from flowers such as honeysuckle?

Description : Is there a quick and easy way to extract essential oils from flowers such as honeysuckle?

Last Answer : answer:DIY This is a gardeners guide to extracting oils

What's the best way to get oils from hot peppers off your hands?

Description : What's the best way to get oils from hot peppers off your hands?

Last Answer : I use copious amounts of lemon juice and a vegetable scrubbing brush, then wash your hands with soap and water, and apply some nice moisturizer. Lemon juice will really dry out your skin.

Ever had an aromatherapy treatment? What were the oils used?

Description : Ever had an aromatherapy treatment? What were the oils used?

Last Answer : Nobody interested?

Are the oils in a mango's skin toxic?

Description : Are the oils in a mango's skin toxic?

Last Answer : You can be allergic to mango skins. But that doesn't mean they're toxins, except for the person who is allergic to them. So I guess "toxin" is a relative term.

can I use frozen herbs in the flavoured oils

Description : can I use frozen herbs in the flavoured oils

Last Answer : You could but the taste won't be the same.....I prefer fresh it has a better taste in the oil.

How did ‘Cargill Foods’ become the largest producer of edible oils in India ? -SST 10th

Description : How did ‘Cargill Foods’ become the largest producer of edible oils in India ? -SST 10th

Last Answer : (i) Cargill foods is a very large American MNC. It has bought over smaller Indian companies such as Parakh Foods and expanded the range of its production of edible oils in India. (ii) Parakh ... industry. (iii) Many popular brands like Sweekar, Nature Fresh, and Gemini are part of Cargill Foods.

the innermost part of a grain that is rich in protein, oils, vitamins, and minerals is known as the -General Knowledge

Description : the innermost part of a grain that is rich in protein, oils, vitamins, and minerals is known as the -General Knowledge

Last Answer : The innermost part of a grain that is rich in protein, oils, vitamins, and minerals is known as the germ.

What oils can be used to prevent hair loss ????

Last Answer : There is no substitute for oil for hair nutrition. Many people do not want to put oil on their hair to make it sticky. This causes the biggest damage to the hair. The oil nourishes the hair from ... from falling out , will help new hair to grow. It will even make your lifeless hair look healthy.

What are essential oils used for?

Description : I found essential oils at home. What is it good for?

Last Answer : They are used in the bath.