Mock Test 1 — Surface Chemistry

Adsorption of gas on solid at low T is:

Enthalpy of chemisorption is:

Catalyst in Contact process:

Enzymes are most active at:

Tyndall effect distinguishes:

$Fe(OH)_3$ sol is:

Brownian motion proves:

Effective coagulant for $As_2S_3$ negative sol:

Butter is example of:

Curdling of milk on standing:

Particle size range in colloid (lower limit in nm):

Number of phases in heterogeneous catalysis (catalyst + reactants in different phase, so min 2):

Number of types of emulsions (basic two types):

Assertion (A): Lyophobic sols need stabilizer for stability. Reason (R): They have weak attraction with dispersion medium.

Assertion (A): Soap acts as good cleansing agent. Reason (R): Soap has hydrophobic tail and hydrophilic head; forms micelles encapsulating oil/dirt.