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Peptization is a process of:
(c) the phenomenon of converting freshly precipitated mass into colloidal by the action of solute or solvent is called peptization
Which acts as poison for Pd-charcoal in lindlar's catalyst ?
(c) Either BaSO4 or Quiniline are used to used the activity of Pd-charcoal. The catalyst Pd-charcoal/BaSO4 or Quiniline is used to hydrogenate alkyne to alkene only
Which electrolyte is least effective in causing coagulation of+ve ferric hydroxide sol?
(a) The lesser valence of Br is responsible for least effective nature.
Platinized asbestos used as a catalyst in the manufacture of H2SO4 is an example of:
(a) SO2(g) + (1/2)O2(g)SO3(g)
In a reversible reaction, a catalyst:
(d) An increase in rate of reaction in forward direction by a catalyst for a reaction in equilibrium brings in an increase in concentration of products and thus, rate of backward reaction also increases to same magnitude and the equilibrium position is not altered.
Gas masks containing activated charcoal to remove poisonous gases from atmosphere acts on the principle of:
(a) the application of adsorption.
Tanning of leather is:
(d) It is defination of tanning of leather.
When sulphur sol is evaporated solid sulphur is left. On mixing with water no colloidal sol is formed. Sulphur sol is:
(b) the process indicates for irreversible nature of sols or hydrophobic sols.
The Critical Micelle Concentration (CMC) is:
(a) It is the minimum concentration at which surfactant molecules undergo aggregation.
On adding 1 mL solution of 10% NaCl to 10 mL gold solution in the presence of 0.25 g of starch, the coagulation is just prevented. Starch has the gold number equal to:
(c) Gold no. is to be reported in mg.
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