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NEET UG CHEMISTRY MCQ: SURFACE CHEMISTRY

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The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statements is not correct?

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Correct option: C

Sodium sulphate solution causes coagulation in both sols

Option C is correct because sodium sulfate will coagulate the positively charged iron(III) hydroxide sol, but it will not coagulate the negatively charged gold sol.

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A cationic colloidal electrolyte forms micelle at

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\log {k}= 0.699,

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\log \;x/m\mathrm{ } \;vs.

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19\;\mathrm{g/c}{\mathrm{m}^3}

{1.9 \times {{10}^{ - 4}}\;\mathrm{g}}

of gold is dispersed in 1 L of water to give a sol having spherical gold particles of radius

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