Which  of the  following substances will  precipitate  the  negatively  charged emulsions?

(i) KCl           

(ii) Glucose                 

(iii)  Urea               

(iv)  NaCl

<p>This is a Multiple Choice Type Questions as classified in NCERT Exemplar</p><p><strong>Ans:</strong> (i) and&nbsp; (iv)</p><p>Negatively charged emulsion can&nbsp; be&nbsp; precipitated by oppositely&nbsp; charged electrolyte. Na+ and K+ from the&nbsp; electrolyte can&nbsp; neutralize&nbsp; the&nbsp; negatively&nbsp; charge&nbsp; emulsion and&nbsp; precipitate&nbsp; the&nbsp; colloid so the answers are (i) and&nbsp; (iv).</p>

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