ECAT MCQs

'Honesty' names a quality rather than a physical object.
Names of qualities, ideas, or states are abstract nouns.

The mobile phase may be a liquid or gas.
Its composition influences separation.

For suitable dilute solutions, absorbance is proportional to concentration.
The relationship also depends on molar absorptivity and path length.

Calibration creates a relationship between signal and concentration.
Unknown samples are interpreted using that relationship.

Primary standards have accurately known composition.
They are weighed directly to prepare or standardize solutions.

Hardness reduces soap lather and can form scale.
It may be temporary or permanent depending on associated anions.

BOD indicates biodegradable pollution in water.
High BOD can deplete dissolved oxygen in receiving waters.

Greenhouse gases reduce outgoing infrared energy loss.
Human emissions strengthen the natural greenhouse effect.

Polymers contain repeated structural units.
They may form by addition or condensation processes.

SO2 and nitrogen oxides form acids in the atmosphere.
Acid deposition can harm ecosystems and materials.

Addition polymerization opens double bonds without small-molecule byproducts.
Polyethene forms from ethene.

Carbohydrates include sugars, starch, glycogen, and cellulose.
Their biological roles include energy supply and structural support.