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According to the Hardy–Schulze rule, the greater the valency of a flocculating ion, the greater will its coagulating power. In Between Ba 2+ (from BaCl 2 ) and K + (from KCl), Ba 2 + has greater valency 2 whereas KCl has valency 1. Therefore, BaCl 2 will be more effective in causing the coagulation of a negatively charged colloidal sol.

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Surface Chemistry

Long Answer Type

221. Explain the term adsorption. How does adsorption differ from absorption? What are the different types of adsorption?

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223. What do you mean by colloidal solution and colloidal state? How do collodal solutions differ from true solutions with respect to dispersed particles size, homogenecity, Brownian movement and Tyndall effect.

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224. How are colloids classified on the basis of (a) physical states of components, (b) nature of dispersion medium and (c) association between dispersed phase and dispersion medium.

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225.

(i) Explain the meaning of the statement. ‘Adsorption is a surface phenomenon.’
(ii) State two features of chemical adsorption which are not found in physical adsorption.
(iii) Explain the terms with suitable examples: (i) Gel, (ii) Aerosol and (iii) Hydrosol.

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Short Answer Type

226.
Out of BaCl₂ and KCl, which one is more effective in causing coagulation of a negatively charged colloidal Sol? Give reason.

According to the Hardy–Schulze rule, the greater the valency of a flocculating ion, the greater will its coagulating power. In Between Ba²⁺ (from BaCl₂) and K⁺ (from KCl), Ba²⁺ has greater valency 2 whereas KCl has valency 1. Therefore, BaCl₂ will be more effective in causing the coagulation of a negatively charged colloidal sol.

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