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1.
In the hydrolysis of a salt of weak acid and weak base, the hydrolysis constant 
is equal to
is equal to
2.
In which reaction ammonia acts as an acid?
3.
The compounds 
and 
are mixed in equimolar proportion to form the products, 
. At equilibrium, one third of and are consumed. The equilibrium constant for the reaction is
and are mixed in equimolar proportion to form the products, . At equilibrium, one third of and are consumed. The equilibrium constant for the reaction is
4.
40% of a mixture of 0.2 mole of 
and 0.6 mole of 
react to give 
according to the equation, 
at constant temperature and pressure. Then the ratio of the final volume to the initial volume of gases is :
and 0.6 mole of react to give according to the equation, at constant temperature and pressure. Then the ratio of the final volume to the initial volume of gases is :
5.
An aqueous solution contains a substance which yields 
ion of 
If 
the 
of the solution is:
ion of If the of the solution is:
6.
For preparing a buffer solution of 
by mixing sodium acetate and acetic acid, the ration of concentration of salt and acid 
should be:
by mixing sodium acetate and acetic acid, the ration of concentration of salt and acid should be:
7.
The concentration of hydrogen ion 
and in 
is:
and in is:
8.
Solubility product of 
at ordinary temperature is 
. pH of a saturated solution of will be
at ordinary temperature is . pH of a saturated solution of will be
9.
For the reaction 
10.
When 
is heated at a constant temperature in a closed container, the pressure due to 
produced will:
is heated at a constant temperature in a closed container, the pressure due to produced will: