General Q&A for Class 12 · Page 169
5,215 free answers in General for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
Which acid is found in bananas?
Bananas contain several organic acids, with malic acid being the most abundant, followed by citric acid. Small amounts of oxalic acid are also present. As bananas ripen, their acid content decreases while sugar content increases, which is why ripe bananas taste sweeter and less tart than unripe ones. These acids contribute to the fruit's overall flavor profile and play roles in various metabolic processes. The total acid content in bananas is relatively low compared to citrus fruits, contribu
- GeneralClass 12All
Is toothpaste acid or base?
Toothpaste is a base (alkaline), typically with a pH between 7 and 10. This alkaline formulation helps neutralize acids in the mouth produced by bacteria feeding on food particles and sugars. By maintaining a slightly basic pH, toothpaste helps protect tooth enamel from acid erosion, prevents cavities, and creates an environment less favorable for harmful bacteria. Some specialized toothpastes may have pH closer to neutral (7), but most formulations are mildly basic to counteract the acidic c
- GeneralClass 12All
What is CH3COO ch2 CH3 called?
CH3COOCH2CH3 (the correct formula) is called ethyl acetate or ethyl ethanoate. This is an ester formed from the reaction between acetic acid (CH3COOH) and ethanol (CH3CH2OH). Ethyl acetate is a common organic solvent with a characteristic sweet, fruity smell. It's widely used in nail polish removers, glues, decaffeination processes, and as a solvent in the pharmaceutical and cosmetic industries. The compound is relatively safe and evaporates quickly, making it useful for various industrial an
- GeneralClass 12All
What is acetate used for?
Acetate has numerous applications depending on its form. Cellulose acetate is used in photographic film, eyeglass frames, and textile fibers. Sodium acetate serves as a food preservative, pH buffer in laboratories, and heating pad component. Vinyl acetate is crucial for producing adhesives, paints, and coatings. Acetate salts are used in pharmaceutical formulations, dialysis solutions, and as buffering agents in chemical processes. In biochemistry, acetate ions play important roles in metabol
- GeneralClass 12All
What is the DST formula?
The DST formula represents the relationship between Distance, Speed, and Time. The three fundamental formulas are: Distance = Speed × Time Speed = Distance ÷ Time Time = Distance ÷ Speed These formulas work together as a triangle: if you know any two values, you can calculate the third. For example, if a car travels at 60 km/h for 2 hours, the distance covered is 60 ×
- GeneralClass 12All
What is the strongest acid?
The strongest acid currently known is fluoroantimonic acid (HSbF6), a superacid that is 10^16 times stronger than pure sulfuric acid. In practical laboratory use, the strongest commonly encountered acids are perchloric acid (HClO4) and sulfuric acid (H2SO4). Among household or industrial acids, sulfuric acid is considered the strongest, followed by hydrochloric and nitric acids. These strong acids completely ionize in water and are extremely corrosive and dangerous to handle without proper sa
- GeneralClass 12All
Which acid is called the queen of acid?
Sulfuric acid (H2SO4) is often called the "queen of acids" or sometimes the "king of chemicals" due to its widespread industrial applications and importance in manufacturing. It's one of the most produced chemicals globally, used in fertilizer production, petroleum refining, chemical synthesis, metal processing, and battery manufacturing. Its versatility, strong acidic properties, and crucial role in numerous industries have earned it this royal designation in chemistry.
- GeneralClass 12All
Who is a king of acid?
Sulfuric acid (H2SO4) is commonly referred to as the "king of acids" or "king of chemicals" in the chemical industry. This title reflects its supreme importance in industrial processes and its status as one of the most widely produced chemicals worldwide. Sulfuric acid's applications span fertilizer production, petroleum refining, ore processing, chemical manufacturing, and countless other industries, making it indispensable to modern industrial civilization and truly deserving of its regal n
- GeneralClass 12All
What foods have acetic acid?
Acetic acid is naturally present in many fermented foods including vinegar, pickles, sauerkraut, kimchi, and kombucha. It's also found in smaller amounts in cheese, yogurt, sourdough bread, and wine. Fresh fruits like apples and grapes contain trace amounts. Any food preserved through vinegar-based pickling will contain acetic acid. Additionally, it's used as a food additive (E260) in various processed foods, condiments, salad dressings, and sauces to enhance flavor, preserve freshness, and r
- GeneralClass 12All
Which acid is called bathroom acid?
Hydrochloric acid (HCl), particularly in diluted form, is often called "bathroom acid" or "toilet acid" because it's a common ingredient in toilet bowl cleaners and bathroom cleaning products. The acid effectively removes mineral deposits, lime scale, rust stains, and hard water buildup from bathroom fixtures. Commercial bathroom cleaners typically contain 5-10% hydrochloric acid, though they may be marketed under names like "muriatic acid" in hardware stores.
- GeneralClass 12All
What is acetic acid used for?
Acetic acid has numerous applications across industries. In food production, it's used as a preservative, flavoring agent, and pH regulator in pickles, condiments, and sauces. Industrially, it's crucial for manufacturing synthetic fibers, plastics, pharmaceuticals, dyes, and pesticides. In households, diluted acetic acid (vinegar) serves as a natural cleaner, disinfectant, and cooking ingredient. Medical applications include antiseptic uses and wart removal treatments. It's also employed in p
- GeneralClass 12All
What is a weak acid drug?
A weak acid drug is a pharmaceutical compound that contains acidic functional groups and exists in equilibrium between ionized and non-ionized forms depending on the pH of its environment. Examples include aspirin, ibuprofen, and penicillin. The ionization state affects the drug's absorption, distribution, and effectiveness in the body. Weak acid drugs are typically better absorbed in acidic environments (like the stomach) where they remain in their non-ionized, more lipid-soluble form that c
- GeneralClass 12All
What is the pH of acetic acid?
The pH of acetic acid varies depending on its concentration. A typical household vinegar solution (5% acetic acid) has a pH around 2.4-3.4. Pure glacial acetic acid has a pH close to 2.4, while more diluted solutions have progressively higher pH values. The exact pH depends on both the concentration of acetic acid and the degree of ionization in the solution. As a weak acid, acetic acid doesn't fully dissociate, which is why its pH is higher than strong acids of similar concentration.
- GeneralClass 12All
What is the pH of 99% acetic acid?
The pH of 99% acetic acid (glacial acetic acid) is approximately 2.4 when measured directly, though measuring pH of such concentrated solutions can be challenging. When diluted, the pH will vary based on the final concentration. It's important to note that 99% acetic acid is extremely corrosive and dangerous to handle – it can cause severe burns to skin and damage to respiratory systems. This highly concentrated form should only be used in controlled laboratory or industrial settings wi
- GeneralClass 12All
What is 1% acetic acid?
1% acetic acid is a diluted solution containing 1 gram of acetic acid per 100 milliliters of solution. This mild concentration is commonly used for various purposes including medical applications (ear irrigation, wound cleaning), laboratory work, and food preservation. It has a pH of approximately 3.4-3.9, making it much less acidic than vinegar (which contains about 5% acetic acid). The 1% solution is gentle enough for many sensitive applications while still providing mild acidic properties.
- GeneralClass 12All
What is the pH of a weak acid?
The pH of a weak acid typically ranges from 3 to 6, depending on its concentration and acid dissociation constant (Ka). Unlike strong acids that have pH values close to 0-1, weak acids only partially ionize in solution, resulting in fewer free hydrogen ions and therefore a higher pH. For example, acetic acid solutions generally have pH values between 2.4 and 4.8 depending on concentration. The exact pH can be calculated using the acid's Ka value and its molar concentration.
- GeneralClass 12All
Which pH is vinegar?
Vinegar typically has a pH between 2.4 and 3.4, with most household vinegars around pH 2.5-3.0. This acidity comes from the 4-7% acetic acid content in vinegar. White distilled vinegar usually has a pH closer to 2.4, while apple cider vinegar and wine vinegars may be slightly less acidic (pH 2.8-3.0) due to additional compounds. This acidic pH makes vinegar effective for cooking, cleaning, and food preservation while remaining safe for consumption.
- GeneralClass 12All
Which organs remove urea?
The kidneys are the primary organs that remove urea from the body. They filter blood, extract urea and other waste products, and eliminate them through urine production. The liver creates urea, but the kidneys handle its removal.
- GeneralClass 12All
How is urea removed from the body?
Urea is removed through urination. The kidneys filter urea from the blood, concentrate it in urine, which then passes through the ureters to the bladder and is eventually expelled from the body.
- GeneralClass 12All
Is urea harmful to humans?
Urea itself is relatively non-toxic at normal levels, which is why the body uses it to safely transport nitrogen waste. However, elevated blood urea levels indicate kidney dysfunction or other health problems and can become harmful if not addressed.