12th class (Fsc) Chemistry unit 5 MCQs
26. Teflon containers are especially used for the handling of:
a. HBr
b. HCL
c. HI
d. HF
27. Which following halogens has maximum number of oxides?
a. CI2
b. I2
c. F2
d. Br2
28. At 363oC O3F2 is a:
a. red-brown gas
b. Colorless gas
c. Black solid
d. Dark red viscous liquid
29. I2O5:
a. Pale yellow green gas
b. Colorless gas
c. Crystaline solid
d. Dark red vicous liquid
30. I2O5 forms iodic acid with:
a. Acetone
b. Water
c. NaOH
d. Alcohol
31. I2O5 reacts with H2S,HCL and CO as:
a. Reducing agent
b. An acid
c. None of these
d. An oxidizing agent
32. Perchloric acid is:
a. Colorless gas
b. Hygroscopic liquid
c. Crystaline solid
d. Deliquescent liquid
33. When CI2 is passes through NaOH solution cold state, it produce:
a. NaCL+NACIO2
b. NaCL+NACIO
c. NaCI+H2O
d. NaCL+NACIO3
34. When CI2 is passes through NaOH solution in hot state, it produce:
a. NaCL+NACIO2
b. NaCL+NACIO
c. NaCI+H2O
d. NaCL+NACIO3
35. Oxygen containing stable acids of fluorine are:
a. Only one
b. So many
c. Zero
d. A few
36. When chlorine is passes through dry slaked lime at room temperature, the min product will be:
a. Ca(OC)CI
b. Ca(CIO)2
c. Ca(CIO2)2
d. CaCl2
37. Bleaching powder is an example of:
a. Complex salt
b. Mixed salt
c. Double
d. Normal salt
38. Salt chlorine acts as a bleaching agent only in presence of:
a. Moisture
b. Pure O2
c. Sunlight
d. Dry Air
39. Which of the following halogens is solid at room temperature?
a. Br2
b. F2
c. I2
d. CI2
40. Goiter is caused due to deficiency of:
a. Chlorine
b. Fluorine
c. Iodine
d. Bromine
41. Which is use as a non-stick coating for cooking pans?
a. Argon
b. Freon
c. Krypton
d. Teflon
42. which halogen is used as an insecticide?
a. CI2
b. Br2
c. F2
d. I2
43. Which of the following is used as refrigerant?
a. Freon
b. CI2gas
c. F2gas
d. Taflon
44. The chemical formula of freon is:
a. CCI2F2 -CCIF
b. CCI2F2 -CCIF3
c. None of these
d. CCIF2-CBrF2
45. The chemical formula of teflon is:
a. CCI2F-CCIF3
b. CCI2F2 -CCIF3
c. CCIF2 -CBrF3
d. None of these
46. Fluorine is largely used in:
a. Making freon
b. Rocket fuel
c. Making teflon
d. All of these
47. Photograpic plates are coated with a film of:
a. AgCI
b. AgNO3
c. AgBr
d. Agl
48. Which is second most abundant element in the universe?
a. O
b. H
c. C
d. He
49. The most inert among the noble gases is:
a. Xe
b. Kr
c. He
d. Ar
50. The amount o noble gases in the atmospher is:
a. More then 1%
b. 1%
c. 5%
d. Less then 1%