Tag: science & technology

Dry ice (solid carbon dioxide) was first discovered in 1825 by French chemist Charles Thilorier. He observed that pressurizing liquid carbon dioxide caused it to solidify, creating what we now know as dry ice.

A typical laying hen produces approximately 250-300 eggs annually, which equals about 19-25 dozen eggs per year. Option B (19 dozen = 228 eggs) falls within this realistic range, though on the lower end. Higher-producing breeds can lay closer to 21 dozen (252 eggs), while 12 dozen (144 eggs) is below average for commercial laying hens and 5 dozen (60 eggs) is far too low.

CO2 is the chemical formula for carbon dioxide, a compound consisting of one carbon atom bonded to two oxygen atoms. Nitrogen is N2, Calcium is Ca, and 'Citrius' is not a valid chemical name. Carbon dioxide is a greenhouse gas and product of respiration and combustion.

CH3COOH is the molecular formula for acetic acid, the main component of vinegar. It consists of a methyl group (CH3) bonded to a carboxyl group (COOH). Vinyl Acetate is C4H6O2, Chloroform is CHCl3, and 'Methanic Acid' is not a standard chemical name (formic acid is HCOOH, also called methanoic acid).

C3H8 is the molecular formula for propane, a three-carbon alkane used as fuel. Methane is CH4, Ethanol is C2H5OH (C2H6O), and Methanol is CH3OH (CH4O). Propane is commonly used in heating and cooking applications.

HCl is the chemical formula for hydrogen chloride, which in aqueous solution forms hydrochloric acid, a strong acid. Chlorine is Cl2, Chloroform is CHCl3, and Sulphuric Acid is H2SO4. Hydrochloric acid is found in gastric juice and used industrially.

NH3 is the chemical formula for ammonia, a compound of nitrogen and hydrogen. 'Nitrous' typically refers to nitrous oxide (N2O), Nitrogen dioxide is NO2, and Hydrochloric acid is HCl. Ammonia is a pungent gas used in fertilizers and cleaning products.

ZnO is the chemical formula for Zinc Oxide, an inorganic compound commonly used in ointments, sunscreens, rubber manufacturing, and as a dietary supplement. It is a white powder that is nearly insoluble in water. Zinc alone is just Zn, and the other options (Zinc Phosphorus and Zinc Sulphur) are not standard chemical formula representations.

O2 is the molecular formula for oxygen, a diatomic gas essential for respiration and combustion. Phosphorus is P4 in its white form, Oxide is a class of compounds (not a specific substance), and Bromide refers to bromine compounds (Br-). Oxygen makes up about 21% of Earth's atmosphere.