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
Which of the following pairs constitutes a buffer ?
HNO2 and NaNO2
NaOH and NaCl
HNO3 and NH4NO3
HCl and KCl
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
At 250C, the dissociation constant of a base, BOH is 1.0 ×10-12. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be
2.0 ×10-6 mol L-1
1.0 ×10-5 mol L-1
1.0 ×10-6 mol L-1
1.0 ×10-7 mol L-1
The values of Kp1 and Kp2 for the reactions and are in ratio of 9:1.If degree of dissociation of x and A be equal, then total pressure at equilibrium (i) and (ii) are in the ratio .
3:1
1:9
36:1
1:1
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
The conjugate acid of NH2- is
N2H4
NH4 +
NH2 OH
NH3
Aqueous solution of acetic acid contains-
CH3COO- and H+
CH3COO-, H3O+ and CH3COOH
CH3COO-, H3O+ and H+
CH3 COOH, CH3COO- and H+
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
The Strongest conjugate base is
NO3-
Cl-
SO4 2-
CH3COO-
