12th class (Fsc) Chemistry unit 2 MCQs
26. Soda lime is often employed to remove both:
a. H2O and CO2
b. H2O and NO2
c. H2S and CO2
d. CO and CO2
27. The milk of magnesia is used foe the treatment of:
a. Rancidity
b. Acidity
c. Basicity
d. None of these
28. Oxides used in mountanier’s breathing equipment is:
a. K2O
b. Na2O
c. KO2
d. Na2O2
29. In potassium super oxide, oxidation state of O is:
a. 1/2
b. -1
c. -4
d. -2
30. Basic character of alkali metals down the group:
a. Remains constant
b. Increases
c. Decreases
d. None of above
31. Alkali metals hydrocides are generally hygroscopic except:
a. LiOH
b. NaOH
c. RbOH
d. KOH
32. Milk of magnesia is a suspension of:
a. Mg(OH)2
b. NaOH
c. KOH
d. Ca(OH)2
33. Chemical formula of washing soda is:
a. Na2CO3 .10H2O
b. Na2CO3
c. Na2CO3 .H2O
d. Na2CO3 .5H2O
34. The transition temperature for Na2 CO3 .10H2 O to Na2CO3 .H2 ???????O is:
a. 48K
b. 35.2K
c. 48oC
d. 35.2oC
35. Melting point of sodium chloride is:
a. 801oC
b. 601oC
c. 901oC
d. 701oC
36. To decrease the melting point of NaCL:
a. BaCL2 is added
b. KCL is added
c. CaCl2 is added
d. Fe is addded
37. Which one is the advantage of carrying out the process at 600oC?
a. Cell is not attacked by the products
b. The metallic fog is not produced
c. Easy collection of sodium
d. All of the above
38. In Down’s is cell chloride is collected at:
a. In the solution
b. Cathode
c. As precipitate
d. Anode
39. In Down’s cell anode is made up of:
a. Copper
b. Carbon
c. Zine
d. iron
40. In Down’s cell cathde is made up of:
a. Copper
b. Carbon
c. Zine
d. iron
41. The process happens at cathode is:
a. Redox
b. Reduction
c. Oxidation
d. All
42. The formula of common salt used in our daily life is:
a. Sodium hydroxide
b. Sodium carbonate
c. Sodium sulphate
d. Sodium chloride
43. A cell used for the prepartion of sodium metal is named by:
a. L.C. Down
b. Newton
c. Nelson
d. Haber
44. Both Down’s and Nelson’s cells are:
a. Galvanic cell
b. Electrolytic cell
c. Both a and b
d. None
45. Caustic soda is:
a. Hygroscopic
b. Efflorescent
c. Oxidant
d. Deliquescent
46. One of the following product during electrolysis of NaCl solution is:
a. Na
b. NaCLO
c. NaNO2
d. NaOH
47. Elecrolysis of aqueous sodium chloide leads to the formation of:
a. Na and CL2
b. Na and H
c. H2 and CL2
d. Na and O2
48. The commonly used name for sodium hydroxide:
a. Caustic soda
b. Soda ash
c. Baking soda
d. None of these
49. The saturated solution for common salt is called:
a. Brine
b. Caustic
c. Potash
d. Soda
50. Caustic soda is prepared in:
a. Hasenclever plant
b. Nelson cell
c. Down cell
d. None of these