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NEET Practice Questions (MCQs) with Answers & Solutions

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All Physics Chemistry Botany Zoology

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Which is not lyophilic colloid ?

Milk

Gum

Fog

Blood

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Explanation

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Surface tension of lyophilic sols is:

lower than H₂O

more than H₂O

equal to H₂O

none of these

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Explanation

(a) Lyophilic sols have lower surface tension than H₂O due to loving nature towards H₂0.

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Hardy-Schulze rule states that:

non-electrolytes have better coagulating action on colloids than electrolytes

sols are coagulated by effective ions whose charge is opposite to that of sol and the ions of higher charge are much more effective than the ions of lower charge

charge of the ions has no effect on the coagulation of a sol

sols are coagulated only by those ions whose charge is similar to that of the sol

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Explanation

(b) It is the definition of rule.

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An example of intrinsic colloid is:

As₂S₃ sol

Fe(OH)₃ sol

egg albumin

Au sol

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Explanation

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Tails of comets are visible due to:

Tyndall effect

reflection

Brownian motion

none of these

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Explanation

(a) Tyndall effect or scattering of light by smoke.

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Bleeding is stoped by the application of ferric chloride. This is because :

the blood starts flowing in the opposite direction

the blood reacts and a solid is formed which seals the blood vessel

the blood is coagulated and the blood vessel are sealed

the ferric chloride seals the blood vessel

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Explanation

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The Brownian movement occurs in:

colloidal solution

true solution

suspension having size <500 m $μ$

all of the above

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Explanation

(d) Note that pollen grains also move irregularly in water, i.e., lighter and smaller suspended particles. In true solution of sugar, the sugar particles are also in motion in solution.

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Dust storm is:

dispersion of solid in gas

dispersion of a gas in solid

dispersion of solid in solid

dispersion of a gas in liquid

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Explanation

(a) Dust storm is solid dispersed in a gas, a class (solid aerosol) of colloidal system.

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Which is not a colloid?

Chlorophyll

Egg white

Ruby glass

Milk

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Explanation

(a) Chlorophyll is a compound.

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Chemisorption is:

multimolecular in nature

reversible

often highly specific and directional

not very specific

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Explanation

(c) Chemisorption is directional, irreversible and unimolecular exothermic process where adsorbate molecules are adsorbed on active centres of adsorbent by chemical forces.

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Yes. You can attempt every NEET question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.