The hydride ion H- is strong base than its hydroxide ion OH-. Which of the following reactions will occur if sodium hydride (NaH) is dissolved in Water ?
2H-(aq) + H2O(l)→H2O+H2 +2e-
H-(aq) + H2O(l)→OH-+H2
H - + H2O(l) → no reaction
None of the above
Solubility of a M2S 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 HCl with 30.0 mL of 0.10 M Ba(OH)2?
0.10 M
0.40 M
0.0050 M
0.12 M
Calculate the pOH of a solution at 250C that contains 1.0×10-6 M of hydronium ions .
7.00
4.00
9.00
1.00
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)
Which of the following pairs constitutes a buffer ?
HNO2 and NaNO2
NaOH and NaCl
HNO3 and NH4NO3
HCl and KCl
Which one of the following is true for any diprotic acid H2X?
Ka2=Ka1
Ka2>Ka1
Ka2< Ka1
Ka2= 1 / Ka1
The concentration of [H+] and concentration of [OH- ] of a 0.1M aqueous solution of 2% ionised weak monobasic acid is [ionic product of water = 1×10-14 ]
0.02×10-3 M and 5×10-11 M
1×10-3 M and 3×10-11 M
2×10-3 M and 5×10-12 M
3×10-2 M and 4×10-13 M
The pH value of blood does not change appreciably by a small addition of an acid or base ,because the blood -
is a body fluid
can be easily coagulated
contains iron as a part of the molecule
contains serum protein that acts as buffer
What is the correct relationship between the pHs of isomolar solutions of sodium oxide (pH1) and sodium sulphide (pH2), sodium selenide (pH3) and sodium telluride (pH4)?
pH1>pH2 ≈ pH3 >pH4
pH1<pH2 < pH3<pH4
pH1<pH2 < pH3 ≈ pH4
pH1>pH2 > pH3 >pH4
