Catalysts and Rate of Reaction

Q.

Identify $\mathrm{x},\mathrm{y}$and $\mathrm{z}$in the following reaction $\underset{\mathrm{potassium}\mathrm{chlorate}}{{\mathrm{KClO}}_3\left(\mathrm{x}\right)}\stackrel{\left(\mathrm{y}\right)}{\to }\underset{\mathrm{Potassium}\mathrm{chloride}}{2\mathrm{KCl}\left(\mathrm{x}\right)}+\underset{\mathrm{oxygen}}{{\mathrm{O}}_2\left(\mathrm{z}\right)}$

1. $\mathrm{x}=$gas, $\mathrm{y}=$reaction condition, $\mathrm{z}=$gas

2. $\mathrm{x}=$solid $\mathrm{y}=$liquid $\mathrm{z}=$gas

3. $\mathrm{x}=$number of moles of ${\mathrm{KClO}}_3$, $\mathrm{y}=$reaction condition, $\mathrm{z}=$number of molecules of oxygen

4. $\mathrm{x}=$The physical state of ${\mathrm{KClO}}_3$ and $\mathrm{KCl}$, $\mathrm{y}=$reaction condition, $\mathrm{z}=$Physical state of ${\mathrm{O}}_2$

Q.

Differentiate betweenthe following.

Chemical and Biochemical reactions

Q. A negative catalyst the rate of a reaction.

1. increases
2. decreases
3. maintains

Q.

Give the following terms and give one example of each.

Negative catalyst.

Q.

Analyze the given reaction below:

$2H_2{O}_2\stackrel{Mn{O}_2}{\to }2H_{2}O+O_2$

Which component will be left after the completion of the reaction?

1. $2H_2{O}_2$
2. $Mn{O}_2$
3. $O_2$
4. $2H_{2}O$

Q.

A substance which increases the rate of a reaction is known as a positive catalyst.

1. True

2. False

Q. A catalyst is used

1. For altering the rate of a reaction
2. Only for decreasing the rate of a reaction
3. Only for altering the chemical equilibrium
4. Only for increasing the rate of a reaction

Q.

A substance which decreases the rate of a reaction is known as a negative catalyst.

1. True

2. False

Q. What happens when:
(i) Lead nitrate is heated
(ii) crystals of $FeS{O}_4$ are heated ?