Enzymes are
Microorganism
Proteins
Inorganic compounds
Moulds
Related Questions
The activity and selectivity of zeolites as catalyst is based on :
Their pore size
Size of their cavities on the surface
Both (1) and (2)
None of the above
A catalyst in the finely divided form is most effective because :
Less surface area is available
More active centres are formed
More energy gets stored in the catalyst
None of the above
The efficiency of enzyme catalysis is due to its capacity to
From a strong enzyme-substrate complex
Change the shape of the substrate
Lower the activation energy of the reaction
Form a colloidal solution in water
Which is universally correct for catalyst?
A catalyst remains unchanged chemically at the end of chemical reaction
A catalyst takes part in a chemical reaction
All kinds of catalysts undergo catalytic poisoning
A catalyst physically changes at the end of reaction
In a chemical reaction, catalyst
Decrease the energy of activation
Increases the energy of activation
Does not change energy of activation
None of the above
When a catalyst is added to a system the:
Equilibrium concentrations are increased
Equilibrium concentrations are unchanged
The rate of forward reaction is increased and that of backward reaction is decreased
Value of equilibrium constant is decreased
Which acts as negative catalyst?
Lead tetraethyl as antiknock compound
Glycerol in decomposition of
Ethanol in oxidation of chloroform
All of the above
Hydrolysis of protein in stomach and in intestine takes place due to action of enzyme :
Pepsin in stomach, trypsin in intestine
Trypsin in stomach, pepsin in intestine
Both (1) and (2)
None of the above
Which of the following statements is INCORRECT regarding the effect of a catalyst on a chemical reaction?
It increases the rate of both forward and backward reactions.
It provides an alternate pathway with lower activation energy.
It alters the enthalpy change of the reaction.
It does not affect the equilibrium constant of the reaction.
The decomposition of hydrogen peroxide can be slowed by the addition of acetamide. The latter acts as a
Detainer
Stopper
Promoter
Inhibitor
