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NEET Practice Questions (MCQs) with Answers & Solutions

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The catalyst used in the lead-chamber process of sulphuric acid is:

platinum

nitric oxide

nickel

vanadium pentoxide

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Explanation

(b) $2 {SO}_{2} + O_{2} \overset{NO}{\to} 2 {SO}_{3}$ ; NO is catalyst

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Medicines are more effective if they are used in:

colloidal state

solid state

solution state

none of these

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Explanation

(a) colloidal state have large surface area and provides effective adsorption of medicine to bring in better results.

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Hydrolysis of maltose (C₁₂H₂₂O₁₁) by maltase gives:

glucose

fructose

both (a) and (b)

none of these

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Explanation

(a) C₁₂H₂₂O₁₁ $\overset{Maltase}{\to}$ 2C₆H₁₂O₆

Maltose Glucose

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Hydrolysis of cane-sugar is catalysed by:

H⁺

mineral acids

enzymes

all of these

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Explanation

(d) H⁺ from weak acids or strong acids or enzyme's invertase catalyse the hydrolysis of sugar.

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Which is not shown by sols?

Adsorption

Tyndall effect

Flocculation

Paramagnetism

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Explanation

(d) Rest all are characteristics of sol.

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Detergent action of synthetic detergents is due to their:

interfacial area

high molar mass

ionisation

emulsifying properties

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Explanation

(d) The miscelles fromed by detergents in water solubilize the oily stain forming emulsion with it.

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The name aquadag refers for:

Cu in water sol

Pt in water sol

graphite in water sol

none of these

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Explanation

A trade name for graphite water sol.

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Addition of FeCl₃ to K₄[Fe(CN)₆] in dilute and cold solution gives:

prussian blue sol

Fe₄[Fe(CN)₆]₃ sol

positive sol

all of these

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Explanation

(d) Fe₄[Fe(CN)₆]₃ sol is Prussian blue sol of + ve charge.

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Among the electrolytes Na₂SO₄, CaCl₂, Al₂(SO₄)₃ and NH₄Cl, the most effective coagulating agent for Sb₂S₃ sol is:

Na₂SO₄

CaCl₂

Al₂(SO₄)₃

NH₄Cl

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Explanation

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A negatively charged suspension of clay in water needs for precipitation the minimum amount of:

aluminium chloride

potassium sulphate

sodium hydroxide

hydrochloric acid

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Explanation

(a) negatively charged sols require minimum amount of electrolyte having higher valence of cation.

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