Chapter 8

Which of the following are most efficient catalysts? (a) Transition metals (b) Alkali metals (c) Radioactive metals (d) Alkaline earth metals

The name catalyst was proposed by (a) Rutherford (b) Langmuir (c) Graham (d) Berzelius

Efficiency of a catalyst depends upon (a) molecular mass (b) room temperature (c) absolute temperature (d) optimum temperature

Which is not an example of homogeneous catalyst? (a) Formation of ${\mathrm{SO}}_3$ in chamber process (b) Formation of ${\mathrm{SO}}_3$ contact process (c) Hydrolysis of methyl acetate in the presence of an acid (d) Decomposition of ${\mathrm{KClO}}_3$ in the presence of ${\mathrm{MnO}}_2$

A catalyst is a substance which (a) increases the equilibrium concentration of the products (b) changes the equilibrium constant of the reaction (c) shortens time to reach equilibrium (d) supplies energy to the reaction

Which of the following statements is not correct? (a) Catalyst action is specific. (b) A catalyst does not alter the equilibrium. (c) A small amount of catalyst is sufficient to catalyse a reaction. (d) The catalyst initiates the reaction

In the reaction ${\mathrm{KMnO}}_4+{\mathrm{H}}_2{\mathrm{SO}}_4+{\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4\to$ Products, ${\mathrm{Mn}}^{2+}$ ions act as a/an (a) positive catalyst (b) negative catalyst (c) auto catalyst (d) enzyme catalyst

A substance which decreases the rate of a reaction is a/an (a) inhibitor (b) poison (c) moderator (d) promoter