11th class (Fsc) chemistry Unit 8 MCQs
26. The pH of 10-3mol dm-3 of an equeous solution of H2SO4 is:
a. 2.0
b. 3.0
c. 1.5
d. 2.7
27. The term pH was introduced by:
a. Goldsmith
b. Hendersion
c. Thomson
d. Sorenson
28. pH of a solution is 9, the solution is a:
a. Strong acid
b. Weak acid
c. Strong base
d. Weak base
29. The pH of 10-2 moles dm-3 of an aqueous solution of NaOH is:
a. 3
b. 2
c. 10
d. 12
31. pH of banana is:
a. 9.4
b. 2.1
c. 9.6
d. 4.6
32. pH of milk is:
a. 10.5
b. 6.5
c. 12.5
d. 8.5
33. The pH of 10-2 moles-3 of an aqueous solution of HCl is:
a. 3.0
b. 2.0
c. 1.5
d. 2.7
34. Which aqueous solution has highest pH?
a. 0.1 M HCL
b. 0.1 M NaOH
c. 0.2M HNO3
d. 0.1 M H2SO4
35. The nature of milk is:
a. Neutral
b. Acidic
c. Normal
d. Basic
36. The ionization constant of pure water at 25 oC is:
a. 1.6 x 10 mole-14 dom-3
b. 1.8 x 10 mole-16 dom-2
c. 1.8 x 10 mole2 dom-6
d. 1.0 x 10 mole2 dom-6
37. The pH is 10-4 moles/dm3 of Ba(OH)2 is:
a. 7.5
b. 4.5
c. 10.3
d. 6.4
38. The value of ionic product (Kw) of water at 25oC:
a. 1.0 x 10-14
b. 0.11 x 10-14
c. 3.0 x 10-14
d. 0.30 x 10-14
39. Approximate pH of apple is:
a. 4.2
b. 2.7
c. 4.5
d. 3.1
40. Rain water is:
a. Neutral
b. Slightly acidic
c. Highly basic
d. Slightly Basic
41. The sum of pH and pOH at 25oC always equal to:
a. 14
b. 7
c. 10-14
d. Zero
42. Strength of an acid is determined from the value of:
a. Ka
b. Kw
c. Kp
d. Kc
43. Hig value of Ka means that acid is:
a. Strong
b. Very weak
c. Very strong
d. Weak
44. Sum of pKa is equal to:
a. 0
b. 14
c. 1
d. 7
45. The strongest acid among Halogen acid is:
a. Hl
b. HCL
c. HF
d. HBr
46. Which relationship is correct about the strenght of an acid with the strength is its conjugated base:
a. Ka ∝ ka
b. Ka ∝ 1/kb
c. Ka ∝ kb
d. None of these
47. Ionization of hydrogen sulphide gas is suppressed:
a. HCL
b. KCL
c. NH4Cl
d. NaCL
48. When HCL is passes in saturated solution of NaCl its solubility is:
a. Not affected
b. Increased
c. Decreased
d. None of all
49. By adding NH4 Cl to a solution of NH4OH in water, the ionization ofNH4OH:
a. Remains same
b. Increased
c. Cannot be predicated
d. Decreased
50. The suppression of ionization of weak acid or a weak base by addingone of its own ions is:
a. Buffer capacity
b. Buffer action
c. Ionization effect
d. Common ion effect