Explanation

• Acre does not belong to the list, because it is a unit of area,
• Whereas inch, foot, and yard are units of length.
• The other options exclusively measure one-dimensional distance.

Last updated by NA 26-08-2026

Explanation

• A pH meter is an electronic instrument used to measure the acidity or alkalinity of a liquid solution by determining hydrogen-ion activity.
• Glass electrode: Senses hydrogen ions in the liquid.
• Reference electrode: Provides a stable electrical voltage.
• Meter display: Converts the voltage difference into a clear pH number

Explanation

• Gravimetric analysis is a quantitative analytical method.
• It determines the amount of an analyte by measuring its mass.
• The measured mass is used to calculate the amount of the original substance.

Explanation

Filtration separates solid particles from a liquid or gas based on particle size.

• A porous material (filter) allows fluid and small particles through
• The liquid that passes through is called the filtrate
• The solid left behind on the filter is called the residue
• It works only when the solid particles are larger than the filter's pores

Examples:

• Coffee filter separating grounds from liquid coffee

Explanation

• Based on differences in boiling points
• Lower-boiling-point liquid vaporizes first
• Vapor is collected and condensed back into a liquid
• Higher-boiling-point liquids remain behind
• Used to separate and purify liquid mixtures (e.g., water and ethanol)

Explanation

• Ocean water is not drinkable due to a high amount of sodium chloride (common salt).
• This salt makes water too salty for human consumption.
• Seawater also contains small amounts of other dissolved minerals.
• High salt concentration causes dehydration in the human body.

Last verified on 25-06-2026

Explanation

• Mass and Length are base quantities in SI units.
• Length SI Unit: meter (m)
• Mass SI Unit: kilogram (kg)

Additional information:

Base Quantities in SI System:

• Time (second)
• Electric current (ampere)
• Temperature (kelvin)

Last verified on 16-06-2026

Explanation

• Solvent extraction is controlled by the Distribution Law (Nernst Distribution Law).
• It describes how a solute distributes between two immiscible liquids.
• At equilibrium, the concentration ratio remains constant.
• This law governs equilibrium in extraction processes.

Last verified on 18-06-2026

Explanation

Formula: °F = (9/5)°C + 32  

° F = (9/5)(50) + 32 = 90 + 32 = 122°F

So 50°C feels pretty hot - about 122°F.

Last verified on 09-06-2026

Explanation

• Chromatography mainly works on the principle of adsorption.
• Different substances are adsorbed to different extents on a stationary phase.
• This causes separation of components in a mixture.

Last verified on 05-06-2026