Surface Chemistry

When the reactants and the catalyst are in different phases, then the catalysis is known as heterogenous catalysis.

1. N? (g) + 3H? (g) - (Fe (s)-> 2NH? (g) (Heterogenous catalysis)

2. 2SO? (g) + O? (g) - (NO (g)-> 2SO? (g) (Homogenous catalysis)

3. C? H? O? (aq) + H? O (l) → C? H? O? (aq) + C? H? O? (aq) (Homogenous catalysis)

4. NO (g) + O? (g) → NO? (g) + O? (g)

Aspirin and paracetamol belongs to the class of non-narcotic analgesic.
Morphine and heroin are narcotic analgesics.

For the coagulation of a negative sol flocculating power is
Al³? > Ba²? > Na?

But for coagulating a positive sol the flocculating power will be
PO? ³? > SO? ²? > Cl?

Metal sulphide sols are negatively charged while metal oxide sols are positively charged sols. So, CdS is negative while TiO? is positively charged sol.

Colloidal particles are small enough to pass through an ordinary filter but can be stopped by an ultrafilter paper due to their specific particle size range.

CN? and NO? are examples of ambident nucleophiles.

100 mol of KBr is doped with 10? mol of SrBr?

Therefore, 1 mol of KBr contains 10? mol of SrBr?

Molar mass of KBr = 119 g/mol .

119 g of KBr contains 10? mol of SrBr?

1 g of KBr contains (10? / 119) mol of SrBr?

Each Sr²? ion introduced creates one cation vacancy to maintain electrical neutrality.

Number of cation vacancies = (moles of SrBr? ) * (Avogadro's number)

Number of vacancies = (10? / 119) * (6.023 * 10²³) = 5.06 * 10¹?

The answer provided in the document is "5 (Rounded off)", which likely refers to the coefficient 5.06.

Solid sol is a colloidal system consisting of a gas dispersed in a solid, e.g., pumice stone, foam rubber.

At CMC, the particles cluster together through lyophobic end to form associated colloid called micelle. Further all lyophilic ends (polar head) get projected towards water.