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NEET Practice Questions (MCQs) with Answers & Solutions

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Which method is used for demulsification ?

A. Sulimation B. DIstillation C. Filtration D. Centrifugation

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for the preparation of which substances reversible micelle is used ?

A. Medicines B. Nano products C. Rubber plating D. All the given

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When the rate of physical adsorption will increase ?

A. By reducing pressure B. By reducing temperature C. By increasing temperature D. 1 & 3

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Explanation

Physical absorption can be increased by increasing pressure and reducing temperature.

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According to the adsorption theory of catalysis, the speed of the reaction increases because

A. Adsorption produces heat which increases the speed of the reaction. B. Adsorption lowers the activation energy of the reaction C. The concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption. D. In the process of adsorption, the activation energy of the molecules become large.

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Which of the following property is true ?

A. The particles of colloid can diffuse slowly through semipermeable membrance B. The particles of colloid can not be settle down under the influence of gravitational force C. The particle of colloid can not be observed by ultramicroscope. D. All the given.

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In a case of auto-catalysis

reactant act as a catalyst

heat involved during reaction, act as a catalyst

product act as a catalyst

solvent act as a catalyst

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When light passes through collodial solution it.......

A. is reflected B. is refracted C. is scatterd D. does not affect

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Which of the following is least effective for flocculation >

A. $ K_2 CrO_4 $ B. KBr C. $ K_2 SO_4 $ D. $ K_3 [ Fe(CN)_6 ] $

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0.25g of starch sol is required to prevent coagulation of 10ml gold sol when 1 ml of 10% NaCl solution is present. What is gold number of starch sol ?

A. 0.25 B. 2.5 C. 250 D. 0.025

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Surface tension of lyophilic sol is

A. greater than $ H_2O $ B. equal to $ H_2O $ C. less than $ H_2O $ D. none of these

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