12th class (Fsc) Chemistry unit 4 MCQs
chapter 4 MCQs 12th Class Chemistry
Group VA and Group VIA Elements:
1. The oxide in which N has the highest oxidation state:
a. Nitrogen peroxide
b. Nitrous oxide
c. Nitrous anhydride
d. Nitric oxide
2. Which gas is obtained when urea reacts with nitrous acid:
a. N2O
b. N2
c. NO2
d. NO
3. Phosgene is the common name given to:
a. Acetylene
b. Carbonyl dichloride
c. Phophorus trichloride
d. Phosphine
4. Nitrogen differ from the other elements of group VA in which of the following properties.
a. It forms covalent bond
b. Its outermost shell has five electrons in it
c. +It is a gas at room temperature
d. All
5. Which gas is more heavier than air:
a. NO2
b. N2O
c. CI2
d. NO
6. Outer electronic configuration of group VA element is:
a. ns2np2
b. ns-1 np3
c. ns2 np3
d. ns np1
7. Which one of the following elements occurs free in nature?
a. Nitrogen
b. Antimony
c. Phosphorous
d. Arsenic
8. Which on of the following does not exhibit allotropy?
a. As
b. Bi
c. P
d. Sb
9. Which of the following elements is most metallic?
a. As
b. Bi
c. P
d. Sb
10. The comopound N2O causes disease:
a. Hysterical laughter
b. Cancer
c. Tumbor
d. Sleeping sickness
11. N2O can be prepare by the action of:
a. Dil. HNO3 on Zn
b. Heat on NH4NO3
c. Both a and b
d. None of these
12. Which one is natural oxide?
a. N2O3
b. N2O
c. N2O5
d. N2O4
13. The anhydride of nitric acid is:
a. N2O5
b. N2O4
c. NO
d. N2O3
14. The oxidation state of nitrogen in nitrous oxide is:
a. +2
b. +4
c. +1
d. +3
15. The formula of Nitrous anhydeide is:
a. N2O4
b. N2O
c. N2O5
d. N2O3
16. On reaching dilute nitric acid with metallic zinc, the gas evolved is:
a. NO2
b. N2O
c. N2O4
d. NO
17. Which oxide of nitrogen is also called laughing gas?
a. Dinitrogen tetra-oxide
b. Dinitrogen trioxide
c. Dinitrogen penta oxide
d. Dinitriogen oxide
18. Which gas is evolved when dilute nitric acid treated with copper.
a. Nitrogen peroxide
b. Nitrous oxide
c. Dinitrogen pent oxide
d. Nitric oxide
19. Which of the following is a reddish brown gas:
a. N2O3
b. N2O
c. NO2
d. NO
20. NO2 is called:
a. Nitrie oxide
b. Nitrogen peroxide
c. Nitrite oxide
d. None of these
21. Which one of the following is pale yellow:
a. NO2
b. NO
c. N2O4
d. N2O
22. Which of the following is in the solid state:
a. N2O4
b. N2O5
c. NO2
d. N2O
23. The di-nitrogen oxide can be prepared by heating which one of the following nitrates:
a. NH4NO3
b. Ca(NO3)2
c. None of these
d. KNO3
24. Which one of the following substance canno be oxidized using di-nitrogen oxide?
a. Sulphur
b. Carbon
c. Carbon dioxide
d. Hydrogen
25. The inhaling of nitrous oxide with a little oxygen for a sufficient long time produces hysterical.
a. Laughter
b. Sadness
c. Crying
d. Weeping