Surface Area and Rate of Reaction

Q.

How does a rate of reaction change if we use the powdered form of reactants in place of pellets of reactants?

1. The rate of the reaction increases.

2. The rate of the reaction remains the same.

3. The rate of the reaction first decreases then increases.

4. The rate of the reaction decreases.

Q. The work done in an open vessel at 300K when 112g of iron reacts with dil Hcl (In calories )?

Q.

The rate of reaction increases if the exposed surface area of the reactant is less.

1. True

2. False

Q.

when zinc reacts with hydrochloric acid, a gas librates. This gas burns with pop sound.

(a) Identify the gas and types of reaction involved.

(b) Write a balanced chemical equation for the reaction.

Q. A student performed the reaction between hydrochloric acid and zinc by two methods.
Method 1: Hydrochloric acid was made to react with zinc powder.
Method 2: Hydrochloric acid was made to react with zinc piece.

The student observed that the rate of reaction was much faster in case of method 1. Which of the following factor most probably had an influence on the rate of the reaction?

1. The pressure of the gases
2. The surface area of the reactants
3. The concentration of the reactants
4. The temperature of the reaction

Q. In which of the following case the rate of the reaction will be more?

1. Marble powder reacting with dilute HCl.
2. Marble chip reacting with dilute HCl.
3. Marble stone reacting with dilute HCl.
4. Marble piece reacting with dilute HCl.

Q.

The surface area plays an important role in influencing the rate of reaction in the case of

1. solids

2. concentrate liquids

3. dilute liquids

4. gases