Question

Q.2: Describe with an example, how a chemical reaction reaches chemical equilibrium.

Q.3: Discuss the rules of naming the aqueous solutions of acid.

Q.4: Which of the following can be a component in a buffer?

NaOH
NaC2
H3O2
H2SO4
Ca(OH)2

HBr

Q.5: Describe the significance of the pH scale.

Q.6: Which of the following components can make a buffer solution?

A strong acid and a salt derived from a weak base
A weak acid and a strong base
A weak acid and a salt derived from that weak acid
A weak base and a salt derived from a strong acid
A strong base and a salt derived from that strong base

Answer 1

Let us consider the following reaction

N2 +3H2. < ------->2NH3

INITIALLY there is only N2 and H2 present.when they react they produce NH3.As the reaction proceeds the,the quantity of NH3 increases.this is rate of forward reaction.at the same time some NH3 forms N2 and H2,which is called as rate of backward reaction.

When the rate of forward reaction is equal to rate of backward reaction, equilibrium is achieved. The amount of N2 and H2 giving NH3 is equal to the amount of NH3 giving N2 and H2.at this point concentration, pressure and other parameters of reaction attain a constant value.this is called as equilibrium of reaction.