GK: Class 12 General Q&A · Page 109
3,658 free answers on GK (General) for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- 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.
- GeneralClass 12All
Which fuel is without ethanol?
Pure gasoline (also called ethanol-free gas or "premium non-ethanol") contains no ethanol. This is available at some gas stations, often marketed for small engines, boats, and classic cars. Most modern gasoline contains 10% ethanol (E10), though availability varies by region.
- GeneralClass 12All
What are five uses of ethanol?
The five primary uses are: (1) alcoholic beverages, (2) fuel and fuel additives for vehicles, (3) disinfectants and sanitizers, (4) industrial solvent in manufacturing, and (5) ingredient in pharmaceuticals, cosmetics, and personal care products.
- GeneralClass 12All
Why do rats not like ammonia?
Rats find ammonia's strong, pungent smell overwhelming and irritating to their sensitive respiratory systems. The odor mimics predator urine, triggering their natural avoidance instincts. Many people use ammonia as a rat deterrent, though its effectiveness is temporary as the smell dissipates quickly outdoors.
- GeneralClass 12All
What pests does ammonia keep away?
Ammonia can temporarily repel various pests including rats, mice, raccoons, skunks, and some insects due to its strong odor. However, it's not a long-term solution as the smell dissipates, especially outdoors. Additionally, ammonia can harm plants and pets, so use it cautiously and consider safer alternatives for pest control.
- GeneralClass 12All
What happens if you sniff ammonia?
Sniffing ammonia causes immediate irritation to the nose, throat, and respiratory tract. You may experience burning sensations, coughing, watering eyes, and difficulty breathing. While smelling salts use dilute ammonia to stimulate consciousness, inhaling concentrated ammonia can cause serious respiratory damage, chemical burns to airways, and potentially permanent lung injury.
- GeneralClass 12All
Why does my house smell like ammonia at night?
An ammonia smell in your home could indicate several issues: bacterial growth in drains or HVAC systems, pet urine that needs cleaning, a refrigerant leak from air conditioning or refrigeration equipment, or rarely, a natural gas leak (which has ammonia-like components added). If the smell is strong or persistent, investigate the source immediately and consider calling a professional, especially if you suspect a refrigerant or gas leak.
- GeneralClass 12All
What happens when ammonia is mixed with water?
When ammonia gas dissolves in water, it forms a solution called aqueous ammonia or ammonium hydroxide (NH₄OH). Some ammonia molecules react with water to form ammonium ions (NH₄⁺) and hydroxide ions (OH⁻), creating an alkaline solution. This is the basis for household ammonia cleaners, which are typically 5-10% ammonia in water.
- GeneralClass 12All
What is the pH of toilet cleaner?
Toilet cleaner pH varies by type. Acidic cleaners (containing hydrochloric acid or citric acid) have a pH of 1-3 and are effective against mineral deposits and rust stains. Alkaline cleaners (containing bleach or ammonia) have a pH of 11-13 and work well on organic stains. Always check product labels and never mix different types of cleaners.
- GeneralClass 12All
What is the chemical name of ethanol?
Ethanol's systematic chemical name is ethyl alcohol or ethyl hydroxide. It's an organic compound from the alcohol family with the molecular formula C2H5OH or C2H6O. The name "ethanol" combines "eth-" (indicating two carbon atoms) with "-anol" (signifying it's an alcohol).
- GeneralClass 12All
What does C2H6O stand for?
C2H6O is the molecular formula for ethanol, showing its atomic composition: 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom. This formula represents the simplest way to express ethanol's chemical structure, though it's more commonly written as C2H5OH to show the hydroxyl (-OH) group characteristic of alcohols.
- GeneralClass 12All
What is methanol vs ethanol?
Methanol (CH3OH) and ethanol (C2H5OH) are both simple alcohols but differ significantly. Methanol has one carbon atom while ethanol has two. Critically, methanol is highly toxic and can cause blindness or death if consumed, whereas ethanol is the type found in alcoholic beverages and is relatively safe in moderate amounts. Methanol is used industrially as a solvent and fuel, while ethanol serves as both a beverage ingredient and industrial chemical.
- GeneralClass 12All
What is another name for ethanol?
Ethanol goes by several names including ethyl alcohol, grain alcohol, drinking alcohol, and simply alcohol when referring to beverages. In chemical contexts, it may be called ethyl hydroxide or methylcarbinol, though these terms are less common.
- GeneralClass 12All
Is C2H5 an alcohol?
C2H5 alone is not an alcohol it's an ethyl group (a chemical fragment). When combined with a hydroxyl group (-OH) to form C2H5OH, it becomes ethanol, which is indeed an alcohol. The -OH group is essential for a compound to be classified as an alcohol.
- GeneralClass 12All
Which is more harmful, methanol or ethanol?
Methanol is far more harmful than ethanol. Even small amounts of methanol (as little as 10-30 mL) can be fatal, causing blindness, organ failure, and death. Ethanol, while still toxic in excessive amounts, is metabolized differently by the body and is generally safe in moderate consumption. The liver processes ethanol into less harmful substances, whereas methanol breaks down into formaldehyde and formic acid, which are extremely toxic.
- GeneralClass 12All
Is methanol also alcohol?
Yes, methanol is an alcohol specifically, the simplest alcohol with only one carbon atom. However, it's not safe for human consumption and is used primarily in industrial applications like fuel production, antifreeze, and as a solvent.
- GeneralClass 12All
What are the 7 types of alcohol?
While there are many types of alcohols in chemistry, the main drinkable types are: beer, wine, spirits (distilled liquors), fortified wine, liqueurs, hard cider, and mead. In chemical terms, common alcohols include methanol, ethanol, propanol, butanol, isopropanol, glycerol, and phenol—though only ethanol is safe for consumption.
- GeneralClass 12All
Is ethanol 70% alcohol?
Pure ethanol is 100% alcohol, but 70% ethanol refers to a solution containing 70% ethanol and 30% water. This concentration is commonly used as a disinfectant because it's more effective at killing microorganisms than pure ethanol the water content helps the ethanol penetrate bacterial cell walls.