Which of the following statements about pH and H+ ion concentration is correct ?
Addition of one drop of concentrated HCI in NH4OH solution decreases pH of the solution
A solution of the mixture of one equivalent of each of CH3COOH and NaOH has a pH of 7
pH of pure neutral water is not zero
A cold and conc H2SO4 has lower H+ ion concentration than a dilute solution of H2SO4
Solubility of a M2 S type salt is 3.5 × 10-6 , then find out its solubility product.
1.7 × 10-6
1.7 × 10-16
1.7 × 10-18
1.7 × 10-12
What is the [OH-] in the final solution prepared by mixing 20.0 mL of 0.050 M HCI with 30.0 mL of 0.10 M Ba(OH)2 ?
0.10 M
0.40 M
0.0050 M
0.12 M
The hydride ion H- is stronger base that its hydroxide ion OH-. Which of the following reactions will occur if sodium hydride (NaH) is dissolved in water ?
2H- (aq) + H2 O(l) → H2 O + H2 + 2e-
H- (aq) + H2 O(l) → OH- + H2
H- + H2 O(l) → no reaction
None of the above
The solubility product of CuS, CdS and HgS are 10-31 , 10-44 ,10-54 respectively. The solubility of these sulphides are in the order.
CdS > HgS > CuS
HgS > CdS > CuS
CdS > CuS > HgS
CuS > CdS > HgS
H2S gas when passed through a solution of cations containing HCI precipitates the cations of second group in qualitative analysis but not those belonging to the fourth group. It is because
presence of HCI decreases the sulphide ion concentration
presence of HCI increases the sulphide ion concentration
solubility product of group II sulphides is more than that of group IV sulphides
sulphides of group IV cations are unstable in HCI
Equal volumes of three acid solutions of pH 3,4 and 5 are mixed in a vessel. What will be the H+ ion concentration in the mixture ?
1.11 × 10-4 M
3.7 × 10-4 M
3.7 × 10-3 M
1.11 × 10-3 M
Calculate the pOH of a solution at 25oC that contains 1 ×10-10 M of hydronium ions.
7.00
4.00
9.00
1.00
The ionisation constant of ammonium hydroxide is 1.77 × 10-5 at 298 K. Hydrolysis constant of ammonium chloride is
5.65 × 10-10
6.50 × 10-12
5.65 × 10-13
5.65 × 10-12
Which of the following is most soluble ?
Bi2S3 (Ksp = 1 × 10-70 )
MnS (Ksp = 7 × 10-16 )
CuS (Ksp = 8 × 10-37 )
Ag2S (Ksp = 6 × 10-51 )
