CuO (S).
MgCL2(S).
CaCL2(S).
NaOH(S).
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Drying agents, such as the silica gel packets found in drug bottles, or other moisture sensitive materials, are a good example commonly observed. Basically, hydroscopic materials take moisture out of the atmosphere surrounding them. Some will capture enough moisture to dissolve or dilute themselves. Phosphorus pentoxide (P2O5), calcium chloride (CaCl2), concentrated Sulfuric Acid (H2SO4) all are used as drying agents in chemistry labs. They must be kept in sealed containers to prevent them from using up their drying capacity on water vapor in the ambient atmosphere. Table salt, some spices, and sugar will all harden if they are allowed to absorb much water vapor from tthe kitchen atmosphere.
A. CuO (S): Copper(II) oxide is not hygroscopic; it does not readily absorb moisture from the air.
-B. MgCl2(S)**: Magnesium chloride is hygroscopic and can absorb water from the air.
C. CaCl2(S)**: Calcium chloride is also hygroscopic and commonly used to dry gases and liquids.
D. NaOH(S)**: Sodium hydroxide is hygroscopic and can absorb moisture from the air, often becoming a liquid.
The correct answer is C. CaCl2(S), as it is a well-known hygroscopic substance.
The answer is not A it is C
Some common examples of hygroscopic substances include:
1. *Silica gel*: Often used as a desiccant to control humidity and dry out surroundings.
2. *Salt*: Table salt (sodium chloride) is hygroscopic and can absorb moisture from the air.
3. *Sugar*: Some types of sugar can absorb moisture, affecting their texture and consistency.
4. *Calcium chloride*: A highly hygroscopic substance used in applications like de-icing roads and controlling dust.
5. *Lithium chloride*: Used in humidity sensors and other applications due to its high hygroscopicity.
These substances tend to absorb moisture from the air, which can affect their properties and behavior.
CUO is actually specified as slightly hygroscopic
but the rest are not just hygroscopic but deliquescent in nature
so the correct ans is
A. CUO
The Answer is A😂
Pick the odd one out.
Understand the Question's Intent:
The question asks for "hygroscopic." While deliquescent substances are technically a subset of hygroscopic, Jamb (and many similar exams) often use "hygroscopic" in a broader sense. But as for Jamb, If there's no correct option. Pick the odd one out
Eliminate the Clearly Incorrect:
CuO is not hygroscopic, so eliminate option A.
Recognize the Deliquescent Options:
MgCl₂, CaCl₂, and NaOH are all deliquescent.
Choose the Best Fit:
In a Jamb exam, if you see multiple deliquescent options, and the question asks for hygroscopic, you will have to choose the odd one out👍
There should be an ommition in the question because all the compound listed are deliquescent except for CuO
The correct answer is C. CaCl2(S).
A hygroscopic substance is a substance that has a tendency to absorb moisture from the surrounding environment. CaCl2(S) is a hygroscopic substance that is commonly used as a drying agent in various industrial and laboratory applications. When exposed to air, it readily absorbs moisture and forms hydrated CaCl2, which has a lower vapor pressure and effectively removes moisture from its surroundings. CuO(S), MgCl2(S), and NaOH(S) are not considered to be hygroscopic substances.
