1 ) The Solution contains 10 ml of 0.1 NaOH and 10 ml of 0.05 Na2SO4 . pH of solution is . . . . . . . . . : -
A ) base , B
) acid ,
C ) neutral , D
) None of these ,
Correct
Answer : - A ) base ,
Method
1 : -
So first check equivalent : -
So , Eq of NaOH = 10 x 0.1 = 1 M Eq.
Eq of Na2SO4 = 10 x 0.05 = 0.5 M Eq.
So remaining 0.5 M Eq. of NaOH and so pH of base is greater than 7 .
Method
2 : -
NaOH + Na2SO4 ------> . . . . . . . . . . . . . ,
So , NaOH is strong base and pH of strong base is greater
than 7 .
Na2SO4 is salt because Na2 is strong base and SO4 is
strong acid . And pH of salt is equal to 7 .
So , pH of solution is greater than 7 . So , pH of solution
is base .
2 )
Why BeO is atmospheric in nature ?
Because BeO dissolve in both strong acid and base solute
.
3 )
Ozone layer refers to reduction in thickness of Ozone layer in stratosphere .
4 )
Graphite is good conductor of electricity and diamond is not .
5 )
Hydrogen is reactive element . It reacts all elements except VIII A in
periodic table . The compound that forms hydrogen are known as hydrides . The
bonding between hydrogen and other elements is always covalent .
6 )
Base principle of crystallization is that amount of solute that can be
dissolved by a solvent increases with temperature .
7 ) When pressure increases , so density will increase and vice versa .
