12th class (Fsc) Chemistry unit 4 MCQs
26. The chemical formula of nitric anhydride is:
a. N2O5
b. N2O
c. N2O4
d. N2O3
27. The oxidation state of nitrogen in nitrogen peroxide is:
a. +4
b. +5
c. -1
d. +3
28. When sulphur dioxide passes through aqueous nitrons acid. it is oxidized to:
a. Sulphur
b. SO3
c. H2SO4
d. H2SO3
29. When acidified staneous chloride is treated with nitrous, then which oxide of nitrogen os evolved?
a. NO
b. NO2
c. N2O3
d. N20
30. Which one of the following can act as an oxidizing agent?
a. HNO2 and HNO3
b. NO
c. N02
d. All of given
31. Which of the following metals do not react with nitric acid:
a. Ti
b. Au
c. Pt
d. All of the given
32. Which one of the following cannot reduce nitrous oxide to nitrogen?
a. P4
b. SO3
c. Cu
d. Co
33. The oxidation state of nitrogen in nitrous anhydride is:
a. +5
b. +4
c. +2
d. +3
34. Which one of the following gas is evolved when copper reacts with dil. HNO3–
a. NO2
b. NO
c. N2O
d. None of these
35. Which of the following metal react with HNO3-
a. Platinum
b. Titanium
c. Magnesium
d. Iridium
36. TNT is prepared by the action of nitric acid on;
a. Phenol
b. Toluene
c. Benzene
d. None of these
37. Aqua regia can dissolve noble metals due to the formation of;
a. Nitric oxide
b. Nitrosyl chloride
c. Nitrous acid
d. Nascent nitrogen
38. Which one of the following metals gives NO gas with dil. HNO3 ?
a. Magnesium
b. Mercury
c. Zinc
d. Copper
39. mWhich one of th following metals gives NO2 gas with conc. HNO3 ?
a. Magnesium
b. Mercury
c. Zinc
d. Copper
40. Which one of the following metals gives H2 gas with HNO3 ?
a. Magnesium
b. Mercury
c. Zinc
d. Copper
41. Gold react with HNO3to give:
a. Aurous nitrate
b. Auric nitrate
c. Do not react
d. Auric nitrate do not react
42. Which of the following has highest ionic character:
a. CCI4
b. PbCl4
c. SiCl4
d. PbCl2
43. Non-metal combine with oxygen to form usually:
a. Acidic oxide
b. Basic oxide
c. Amphoteric oxide
d. Neutral
44. The most allotropic form of sulphur is:
a. Plastic
b. Rhombic
c. Milk of sulphur
d. Monoclinic
45. Which oxidation state is not shown by phospgorus:
a. +3
b. -3
c. -2
d. +5
46. Iron.Cobalt, nickel,chromium and aluminum on treating with nitric acid become pssive due to formation of a film of:
a. Acids
b. Nitrates
c. Nitrites
d. Oxides
47. The name of which element of V-A group comes from Greek work meaning “Lightbearing”?
a. Phosphorus
b. Nitrogen
c. Antimony
d. Arsenic
48. What is the number of electons present in the calence shell of P in PCL3 ?
a. 8
b. 4
c. 2
d. 6
49. PCL3 can be prepared by the action of phosphorus with:
a. HCIO
b. SOCI2
c. HC
d. PH3 +HCIO
50. What are the possible products by he action of hydrolysis of PCI3 :
a. H3PO3 +HCIO
b. H3PO4 +HO
c. H3PO3 +HCL
d. PH3 +HCIO