Q4 of 10 Page 68

The chemical equation for the reaction between marble and dilute HCl is given.

CaCO3 (s) + 2HCl (aq) → CaCl2 (aq) + CO2 (g) + H2O (l)


a) Which is the gas formed here?


b) Suggest two methods for increasing the rate of reaction. Explain the reason for your suggestions.

a) CO2 gas is formed here.

Carbonates on reaction with dilute HCl produces metal chloride, water, and CO2 gas.


b) (i) By increase the concentration- According to collision theory on increasing the concentration, the number of reactant molecules per unit volume increases and the number of molecules undergoing effective collisions also increases. So the reactant molecules will react and form product easily. Hence the rate of reaction will increase.


(ii) By increase the surface area- If solids are made into small pieces or powder then their surface area increases and the number of molecules undergoing effective collisions also increases. So reactant molecules will react and form product easily. So the rate of reaction will increase.


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2


a) Identify the reactants and products.


b) Products are frequently removed from the system. Explain the reason.

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a) Which gas is brown in colour?


b) How does an increase in temperature influence the state of equilibrium?


c) How can the yield of the product NO2 be increased?

 5

2NO(g) + O2(g) ⇋ 2NO2(g) + heat

In this reaction how do the following changes influence the amount of the product?


a) Decrease in temperature


b) Increase in pressure


c) Increase in the concentration of oxygen

 6

N2(g) + 3H2(g) ⇋ 2NH3(g) + heat

a) In this reaction what happens to the volume when the reactants change to the products?


b) What change in pressure is required for the maximum yield of the product?


c) What is the change in the concentration required for increasing the rate of the forward reaction?


d) What is the catalyst used in this reaction? What is its effect?