General Q&A for Class 12 · Page 186
5,215 free answers in General for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
What alcohol limit causes death?
Blood alcohol concentration (BAC) of 0.40% or higher is often fatal, though death can occur at lower levels depending on individual tolerance. This typically corresponds to consuming 15-20+ drinks in a short period for an average adult. A BAC of 0.08% is legally intoxicated in most places, while 0.30% can cause unconsciousness.
- GeneralClass 12All
Which alcohol is best to drink daily?
No alcohol is recommended for daily consumption from a health perspective. If you choose to drink daily, limit intake to one drink for women or two for men, and consider red wine for its antioxidants. However, daily drinking increases addiction risk and health problems alternating with alcohol-free days is advisable.
- GeneralClass 12All
What organ is most damaged by alcohol?
The liver sustains the most damage from alcohol consumption because it processes nearly all consumed ethanol. This continuous metabolic burden leads to inflammation, scarring, and eventually cirrhosis or liver failure with prolonged heavy drinking.
- GeneralClass 12All
How is ethanol made?
Ethanol is produced through two main methods: fermentation and synthetic production. Fermentation involves yeast converting sugars from crops like corn, sugarcane, or grains into ethanol and CO2. Industrial ethanol is also made synthetically from petroleum-derived ethylene. For beverages, only fermentation-produced ethanol is used.
- GeneralClass 12All
Is ethanol in bananas?
Yes, ripe bananas contain trace amounts of ethanol produced naturally during the ripening process. As fruit ripens, natural fermentation of sugars creates small quantities of ethanol—typically less than 0.5%. This amount is negligible and not sufficient to cause intoxication.
- GeneralClass 12All
Is there ethanol in Coca-Cola?
Regular Coca-Cola contains no ethanol. However, the CO2 carbonation comes from fermentation processes that produce ethanol, which is then removed. Some fermented or special edition versions might contain trace amounts, but standard soft drinks are non-alcoholic.
- GeneralClass 12All
Is methanol in Coca-Cola?
No, Coca-Cola does not contain methanol. The beverage is carefully formulated and regulated to ensure safety, containing water, sugar, flavorings, caffeine, and CO2, but no toxic alcohols.
- GeneralClass 12All
What is ethanol used for?
Ethanol has diverse applications: as the active ingredient in alcoholic beverages, as a fuel additive or biofuel (often blended with gasoline), as an industrial solvent, in hand sanitizers and disinfectants (typically 70% concentration), in pharmaceuticals and medicines, as a preservative, and in the production of various chemicals and cosmetics.
- GeneralClass 12All
What's the healthiest alcohol to drink?
If choosing to drink, red wine and clear spirits (vodka, gin) in moderation are often considered relatively healthier options. Red wine contains antioxidants, while clear spirits have fewer congeners (impurities that worsen hangovers). However, "healthiest" is relative all alcohol carries health risks, and moderation is key.
- GeneralClass 12All
Which alcohol is good for heart and cholesterol?
Red wine is often cited for potential heart benefits due to antioxidants like resveratrol. Moderate consumption of any alcohol may slightly increase HDL ("good") cholesterol. However, excessive drinking damages the heart. The American Heart Association doesn't recommend starting to drink for cardiovascular benefits, as risks often outweigh potential gains.
- GeneralClass 12All
Are there any health benefits to drinking alcohol?
Some studies suggest moderate consumption (one drink per day for women, two for men) may have cardiovascular benefits, potentially reducing heart disease risk. However, these benefits are debated, and any potential advantages must be weighed against risks including cancer, liver disease, addiction, and accidents. Non-drinkers shouldn't start drinking for health benefits.
- GeneralClass 12All
How does C2H5OH affect the brain?
Ethanol (C2H5OH) acts as a central nervous system depressant. It enhances GABA (an inhibitory neurotransmitter) and inhibits glutamate (an excitatory neurotransmitter), slowing brain activity. This causes decreased coordination, slurred speech, memory impairment, and reduced inhibitions. Chronic use can lead to brain damage, cognitive decline, and addiction.
- GeneralClass 12All
What happens when a person drinks ethanol?
When consumed, ethanol is rapidly absorbed through the stomach and small intestine into the bloodstream. It affects the central nervous system, causing relaxation, reduced inhibitions, impaired judgment, and slowed reaction times. The liver metabolizes about one standard drink per hour. Effects depend on amount consumed, body weight, and individual tolerance.
- GeneralClass 12All
Is beer made of ethanol?
Beer contains ethanol (typically 4-6% by volume) as its alcoholic component, but it's not "made of" ethanol. Beer is primarily water with malted grains (usually barley), hops, yeast, and ethanol produced through fermentation. The ethanol is what gives beer its intoxicating effect.
- GeneralClass 12All
Is CO2 in alcohol?
CO2 (carbon dioxide) is not an ingredient in most alcoholic beverages, but it's produced during fermentation when yeast converts sugar to ethanol. Some drinks like beer, champagne, and sparkling wine retain this CO2, creating carbonation. Spirits and still wines don't contain significant CO2.
- GeneralClass 12All
Does ethanol absorb water?
Yes, ethanol is hygroscopic, meaning it readily absorbs water from the atmosphere. This property makes it difficult to maintain 100% pure ethanol, as it naturally attracts moisture. This characteristic is also why ethanol-water mixtures are used in many applications—the water content enhances certain properties.
- GeneralClass 12All
Is ethanol safe in food?
Ethanol is generally recognized as safe (GRAS) in food when used appropriately. It appears naturally in many foods through fermentation and is intentionally added as a flavoring, preservative, or solvent. Small amounts in vanilla extract, some breads, and fermented foods pose no health risk. However, excessive consumption as alcoholic beverages carries health risks.
- GeneralClass 12All
Which petrol has no ethanol?
Availability of ethanol-free petrol varies by country. In regions where it exists, it's typically marketed as "premium unleaded" or specifically labeled as ethanol-free. However, many countries mandate ethanol blending for environmental reasons, making pure petrol increasingly rare.
- GeneralClass 12All
Does Jio petrol have ethanol?
Fuel formulations vary by country and region. In India, where Jio (Reliance) operates, government mandates require ethanol blending in petrol. The current target is to achieve 20% ethanol blending (E20) in petrol. You should check with local Jio fuel stations for current blending percentages.
- GeneralClass 12All
What is gas called without ethanol?
Ethanol-free gasoline is commonly called "pure gas," "ethanol-free gas," "clear gas," or "recreational fuel." It's labeled as such at gas stations and is preferred for certain engines that may be damaged by ethanol-blended fuels.