1. \(\mathrm{PCl}_5\) exists but \(\mathrm{NCl}_5\) does not due to

(a) Inertness of \(\mathrm{N}_2\)

(b) \(\mathrm{NCl}_5\) is unstable

(c) Larger size of \(\mathrm{N}\)

(d) Non-availability of vacant d-atomic orbitals

2. The p-p-p angle in white phosphorous is

(a) \(120^{\circ}\)

(b) \(109^{\circ} 28^{\prime}\)

(c) \(90^{\circ}\)

(d) \(60^{\circ}\)

3. Catalytic oxidation of \(\mathrm{NH}_3\) gives

(a) Nitric oxide

(b) Nitrogen

(c) Nitrogen dioxide

(d) dinitrogen pentoxide

4. Oxygen molecule shows

(a) Para magnetism

(b) Diamagnetism

(c) Ferro magnetism

(d) fern magnetism

5. When \(\mathrm{SO}_2\) is passed through acidified \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) solution.

(a) The solution turns green

(b) The solution is decolourized

(c) Reduction of \(\mathrm{SO}_2\) takes place

(d) Green ppt of \(\left.\mathrm({Cr}_2, \mathrm{SO}_4\right)_3\), is formed

6. \(\mathrm{FeSO}_4\) forms brown ring with

(a) \(\mathrm{NO}_3\)

(b) \(\mathrm{NO}_2\)

(c) \(\mathrm{NO}\)

(d) \(\mathrm{N}_2 \mathrm{O}_3\)

7. The shape of IF molecules is

(a) Tetrahedral

(b) Octahedral

(c) trigonal bipyramidal

(d) Pentagon bipyramidal

8. The strongest oxidizing agent is

   (a) \(\mathrm{HOCl}\)

(b) \(\mathrm{HClO}_4\)

(c) \(\mathrm{HClO}_3\)

(d) \(\mathrm{HClO}_2^{-}\)

9. Iodine can exist in the oxidation states

(a) \(+1,+3,+5\)

(b) \(-1,+1,+3\)

(c) \(+3,+5,+7\)

(d) \(-1,+1,+3,+5,+7\)

10. Fluorine does not show positive oxidation state due to absence of

(a) d-orbitals

(b) s-orbitals

(c) p-orbitals

(d) f-orbitals

11. Structure of \(\mathrm{NH}_3\) is

(a) Trigonal

(b) Tetrahedral

(c) Pyramidal

(d) Trigonal bipyramidal

12. The most stable allotropic form of Sulphur is

(a) Rhombic Sulphur (b) Flowers of Sulphur

(c) Plastic Sulphur

(d) Mono clinic Sulphur

13. The basicity of phosphorous acid \(\left(\mathrm{H}_3 \mathrm{PO}_3\right)\) is

(a) one

(b) two

(c) four

(d) three

14. Which of the following halogen is radioactive in. nature?

(a) Chlorine

(b) Bromine

(c) Iodine

(d) Astatine

15. \(\mathrm{Cl}_2\) is liberated from the cold hydrochloric acid by the action of

(a) \({\mathrm{KMnO}_4}\)

(b) \(\mathrm{K}_2 \mathrm{MnO}_4\)

(c)\(\mathrm{K}_2\mathrm{Cr}_2\mathrm{O}_7\)

(d) \(\mathrm{K}_2 \mathrm{CrO}_4\)

17. Maximum covalency of nitrogen is

(a) two

(b) four

(c) three

(d) five

18. General electronic configuration of group 16 elements is

(a) \(n^2 \mathrm{np}^3\)

(b) \(\mathrm{ns}^2-\mathrm{np}^4\)

(c) \(n s^2 n p^2\)

(d) \(\mathrm{ns}^2 \mathrm{np}^5\)

19. \(\mathrm{NH}_3\) is basic while \(\mathrm{PH}_3\) is

(a) acidic

(b) neutral

(c) amphoteric

(d) basic

20. Name the noble gas not present in the air

(a) Radon

(b) Argon

(c) Krypton

(d) Helium

21. Which is the most abundant noble gas?

(c) \(\frac{\text { Argon }}{\text { Neon }}\)

(b) Helium

(d) Krypton

22. Noble gas used in the miner's cap lamp is

(a) krypton

(b) argon

(c) helium

(d) radon

23. A mixture used for respiration by the sea divers is

(a) \(\mathrm{He}+\mathrm{O}_2\)

(b) \(\mathrm{Ne}+\mathrm{O}_2\)

(c) \({\mathrm{Ar}+\mathrm{O}_2}\)

(d) \(\mathrm{Kr}+\mathrm{O}_2\)

24. Hybridization involved in \(\mathrm{H}_2 \mathrm{O}\) is

(a) \(\mathrm{sp}\)

(b) \(\mathrm{sp}^{3}\)

(c) \(\mathrm{sp}^3 \mathrm{~d}^2\)

(d) \(\mathrm{sp}^2\)

25. The structure of \(\mathrm{SF}_4\) is

\(\begin{array}{ll}\text { (a) Octahedral } & \text { (b) Bipyramidal }\end{array}\)

(c) Square planner

(d) Tetrahedral

26. Which one has the highest bond energy?

(a) \(\mathrm{O}-\mathrm{O}\)

(b) \(\underline{S-S}\)

(c) Se-Se

(d) \(\mathrm{Te}-\mathrm{Te}\)

27. Ozone is

(a) A compound of oxygen

(b) An allotropic oxygen

(c) An isotope of oxygen

(d) An isobar of oxygen

28. Which one of the following does not exist?

(a) \({\mathrm{HeF}^4}\)

(b) \(\mathrm{XeF}_4\)

(c)\(\mathrm{CF}_4\)

(d) \(\mathrm{SF}_6\)

29. Most powerful oxidizing agent is

(a) Fluorine

(b) Chlorine

(c) Iodine

(d) Bromine

30. Which one has lowest boiling point?

(a) \(\mathrm{H}_2 \mathrm{O}\)

(b) \(\underline{H}_2 \underline{\mathrm{S}}\)

(c) \(\mathrm{H}_2 \mathrm{Se}\)

(d) \(\mathrm{H}_2 \mathrm{Te}\)

31. Maximum covalency of Sulphur is

(a) Four

(b) \(\underline{\mathrm{Six}}\)

(c) Three

(d) Two

31. Which one is the strongest reducing agent?

(a) \(\mathrm{HF}\)

(b) \(\mathrm{HCl}\)

(c) \(\mathrm{HBr}\)

(d) \(\mathrm{HI}\)

32. Oxygen exhibit-1 oxidation state in

(a) \(\mathrm{OF}_2\)

(b) \({\mathrm{H}_2} \mathrm{O}_2\) (c)HCIO (d)\(\mathrm{H}_2 {O}\)

33. Fluorine can exist in the oxidation state.

(a) -1 only

(b) -1 and +1

(c) \(-1,+1,+3\) only

(d) \(-1,+1,+3,+7\)

34. Among the oxide \(\mathrm{M}_2 \mathrm{O}_3\), teh highest acidic nature is when, \(M\) is

(a) As

(c) \(\mathrm{Bi}\)

(b) \(\frac{\mathrm{P}}{\mathrm{Sb}}\)

35. Phosphorescence is exhibit by \(\begin{array}{ll}\text { (a) Yellow phosphorus} & \text { (b) Red phosphorus} \end{array}\)

(c) Both These

(d) None of these

36. The oxidation state of \(\mathrm{O}\)-atom is +2 in

(a) \(\mathrm {O}\mathrm{~F}_2\))

(b) \(\mathrm{O}_2 \mathrm{~F}_2\)

(c)\(\mathrm{H}_2\mathrm{O}\)

(d) \(\mathrm{H}_2 \mathrm{O}_2\)

37. Ozone is readily soluble in

(a) Turpentine oil

(b) Glacial acetic acid

(c) Water

(d) Both ' \(a\) ' and ' \(b\) '

38. The peroxy linkage is present in

(a) Marshali's acid

(b) Sulphuric acid

(c) Oleum

(d) None of these

39. Nitrogen (I) oxide is obtained by

(a) heating \(\mathrm{NH}_4, \mathrm{NO}_3\)

(b) heating \(\mathrm{NH}_4 \mathrm{NO}_2\)

(c) disproportionation of \(\mathrm{N}_2 \mathrm{O}_4\)

(d) the action of \(\mathrm{Cu}\) with conc. \(\mathrm{HNO}_3\)

40. Strong \(p^\pi, p^\pi\) bonds given by

(a) \(\mathrm{P}\)

(b) \(\mathrm{N}\)

(c) \(\mathrm{Bi}\)

(d) As

41. A gaseous mixture contains \(\mathrm{O}_2\) and \(\mathrm{N}_2\) is ratio of \(1: 2\) by mass. The ratio of their number of molecules is

(a) \(1: 2\)

(b) \(2: 1\)

(c) \(4: 7\)

(d) \(7: 16\)

42. The group-16 elements are usually known as

(a) Rare earths

(b) Pseudo-halogens

(c) coinage elements

(d) chalcogens

43. Caro's acid is

(a) \(\mathrm{H}_2 \mathrm{SO}_4\)

(b) \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8\)

(c) \(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_7\)

(d) \(\mathrm{H}_2 \mathrm{SO}_3\)

44. A solution of \(\mathrm{Cl}_2\) in water contains

(a) \(\mathrm{HOCl}\) only

(b) \(\mathrm{HCl}\) only

(c) \(\mathrm{HOCl}\) and \(\mathrm{HCl}\) only

(d) \(\mathrm{HCl}, \mathrm{HOCl}\), and \(\mathrm{Cl}_2\)

45. Among the following, the most basic in character is

(a) \(\mathrm{Br}^{-}\)

(b) \(\underline{\mathrm{F}}=\)

(c) \(\mathrm{Cl}^{-}\)

(d) \(\mathrm{I}^{-}\)

46. The correct order of thermal stability of halogen acids is

(a) \(\mathrm{HI}>\mathrm{HBr}>\mathrm{HCl}>\mathrm{HF}\)

(b) \(\mathrm{HCl}>\mathrm{HF}>\mathrm{HBr}>\mathrm{HI}\)

(c) \(\mathrm{HF}>\mathrm{HCl}>\mathrm{HBr}>\mathrm{HI}\)

(d) \(\mathrm{HF}>\mathrm{HCl}>\mathrm{HI}>\mathrm{HBr}\)

47. In xenon tetrafluoride, the hybridised state of Xe, is

(a) \(\mathrm{sp}^3\)

(b) \(\mathrm{sp}^3 \mathrm{~d}^3\)

(c) \(\mathrm{dsp}^2\)

(d) \(\underline{s p}^3 \mathrm{~d}^2\)

48. Which one of following has zero valency?

(a) \(\mathrm{Si}\)

(b) \(\mathrm{Sc}\)

(c) \(\mathrm{Ca}\)

(d) Ar

49. The number of lone pair(s) of electrons present on \(\mathrm{Xe}\)-atom in \(\mathrm{XeOF}_4\) is/are

(a) 2

(b) \({1}\)

(c) 3

(d) 0

50. The gas, used for inflating aero plane Tyres, is

(a) \(\mathrm{H}_2\)

(b) \(\mathrm{He}\)

(c) \(\mathrm{N}_2\)

(d) \(\mathrm{Ar}\)