Prepare for NEET Chemistry Chemistry In Everyday Life (Soaps And Detergents) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert guidance to differentiate cleansing action and properties of soaps and detergents.
NEET Questions / Chemistry / Chemistry In Everyday Life / Soaps And Detergents
A novel detergent is synthesized with a branched alkyl chain. Compared to a linear-chain detergent with the same number of carbon atoms, the branched detergent will likely exhibit:
increased solubility in water
a lower critical micelle concentration (CMC)
greater foaming capacity
a higher melting point
Which combination of factors would MOST effectively enhance the cleansing action of a soap in hard water?
Decreased temperature and addition of NaCl
Increased temperature and addition of NaCl
Decreased temperature and addition of a chelating agent
Increased temperature and addition of a chelating agent
The Krafft temperature of a surfactant is the temperature:
Below which micelles decompose
At which the surfactant becomes completely insoluble
Above which the surfactant decomposes
Above which micelle formation becomes spontaneous
Which statement regarding cationic detergents is FALSE?
They possess a positively charged hydrophilic head group.
They are often used as fabric softeners and germicides.
They are effective cleaning agents in hard water due to their insensitivity to calcium and magnesium ions.
Their effectiveness is reduced by anionic surfactants.
The hydrophilic-lipophilic balance (HLB) of a surfactant is a measure of its:
Critical micelle concentration
Krafft temperature
Charge density of the hydrophilic head
Affinity for both water and oil
In the process of saponification, which byproduct is formed along with soap?
Fatty acid
Glycerol
Sodium chloride
Water
Which of the following is NOT a characteristic of soaps?
They are sodium or potassium salts of long-chain fatty acids.
They work effectively in hard water.
They have a hydrophilic head and a hydrophobic tail.
They form micelles in water.
The hydrophobic part of a soap molecule is:
A carboxylate group.
A long hydrocarbon chain.
A sodium or potassium ion.
A sulfate group.
Detergents are preferred over soaps in hard water because:
They are cheaper to produce.
They do not form insoluble precipitates with calcium and magnesium ions.
They are less effective cleaning agents.
They have a stronger odor.
Which of the following is a common example of an anionic detergent?
Cetyltrimethylammonium bromide (CTAB)
Sodium dodecyl sulfate (SDS)
Lauryl alcohol ethoxylate
Benzylkonium chloride
