Question

5. Read the following passage carefully and answer the questions.
Magnesium ribbon reacts with both hydrochloric acid and acetic acid but reaction
is faster in hydrochloric acid than in acetic acid. Do you know why? liydrochloric
acid is more reactive than acetic acid. It shows that the nature of the reactant
influences the rate of the reaction.
Granulated zinc reacts with both IM hydrochloric acid and 2M hydrochloric acid.
The rate of evolution of hydrogen gas is more with 2M hydrochloric acid. That is
greater the concentration of the reactant, the greater will be the rate of the reaction.
Powdered calcium carbonate reacts more quickly with hydrochloric acid than
marble chips. Powdered calcium carbonate offers large surface area for the reaction to
occur at a faster rate. This shows that greater the surface area the greater is the rate of
the reaction. Also calcium carbonate reacts slowly with hydrochloric acid at room
temperature whereas on heating the reaction is faster. This shows that increase in
temperature increases the rate of the reaction.
When potassium chlorate is heated, oxygen is evolved very slowly, whereas after
the addition of manganese dioxide to the reactant, oxygen is liberated at a faster rate.
This shows that manganese dioxide acts as a catalyst and influences the rate of the
reaction.
Answer the following questions. Each question carries one mark.
a) Write the factors which influence the rate of a chemical reaction.
b) Why the reaction of magnesium with acetic acid is slow?
c) What is the role of surface area of the reactants in a chemical reaction?
d) What is the effect of temperature in a chemical reaction?
e) What is the role of catalyst in a chemical reaction?​

Answer 1

Answer:

Optical disk store data that can be retrieved with

a) Heat b) light c) sound d) wave

Explanation:

Optical disk store data that can be retrieved with

a) Heat b) light c) sound d) wave

Optical disk store data that can be retrieved with

a) Heat b) light c) sound d) wave