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Question Bank No: 1

1. Oxidation number of iodine in ${IO}_{4}^{-}$ , ${IO}_{4}^{-}$ , Kl and $I_{2}$ respectively are

a)		-1, -1, 0, +1
b)		+3, +5, +7, 0
c)		+5, +7, -1, 0
d)		-1, -5, -1, 0

2. Match list I and list II and pick out correct matching codes from the given choices
$\begin{matrix} List I : Compound & List II : Structure \\ a . Cl F_{3} & 1. Square planar \\ b . P {Cl}_{5} & 2. Tetrahedral \\ c . I F_{5} & 3. Trigonal bipyramidal \\ d . C {Cl}_{4} & 4. Square pyramidal \\ e . Xe F_{4} & 5. T - shaped \end{matrix}$

a)		a-5, b- 4, c-3, d-2
b)		a-5, b-3, c-4, d-2, e-1
c)		a-5,b-3, c-4, d-1, e-2
d)		a-4, b-3, c-5, d-2, e-b

3. The element that does not exhibit positive oxidation is

a)		Cl
b)		O
c)		N
d)		$F^{-}$

4. Which one of the following statements about halogens is correct ?

a)		$F_{2}$ has lower bomd dissociation energy than ${Cl}_{2}$
b)		the electon affinities are in the order F > Cl > Br > I
c)		HF is the strongest hydrohalic acid
d)		all halogens show variable oxidation states

5. The characteristics colours given by calcium, strontium and barium in the flame test are respectively

a)		Brickred, applegreen, crimson
b)		Crimson, applegreen, brickred
c)		Crimson, brickred, applegreen
d)		Brickred, crimson, applegreen

6. Each B - H - B bridge in $B_{2} H_{6}$ is formed by the sharing of

a)		2 electrons
b)		4 electrons
c)		1 electron
d)		3 electrons

7. The main component of glass which gives heat resistance to laboratory glassware is

a)		PbO
b)		MgO
c)		$B_{2} O_{3}$
d)		${Al}_{2} O_{3}$

8. Which of the hydrogen halides forms salts like KH $X_{2}$ (where X is a halogen atom)

a)		HF
b)		HCl
c)		Hl
d)		HBr

9. Which one of the following compounds gives methane on treatment with water ?

a)		${Al}_{4} C_{3}$
b)		Ca ${CO}_{2}$
c)		VC
d)		SiC

10. The ion(s) that act/s as oxidising agent in solution is/ are

a)		${Tl}^{+}$ and ${Al}^{3 +}$
b)		$B^{3 +}$ and ${Al}^{3 +}$
c)		${Tl}^{3 +}$ only
d)		$B^{3 +}$ only

11. Chlorine reacts with excess of ammonia to form

a)		N $H_{4} Cl$
b)		$N_{2}$ +HCl
c)		$N_{2} + N H_{4}$ Cl
d)		$N_{2} + N {Cl}_{3}$

12. Boric acid is used in carom boards for smooth gliding of pawns because

a)		$H_{3} B O_{3}$ molecules are loosely chemically bonded and hence soft
b)		Its low density makes it fluffy
c)		It can be powdered to a very small grain size
d)		H- bonding in $H_{3} B O_{3}$ gives it a layered structure

13. The decreasing order of boiling points of the following hydrides :
a) Hl b) HCl c) HBr d) HF e) $H_{2}$ O

a)		e > d > a > c > b
b)		e > a > b > c > d
c)		b > d > c > a > e
d)		d > c > a > b > e

14. The order of acidic strenght of born trihalides is

a)		${BF}_{3} < B {Cl}_{3} < B {Br}_{3} < {Bl}_{3}$
b)		${Bl}_{3} < B {Br}_{3} < B {Cl}_{3} < {BF}_{3}$
c)		${BCl}_{3} < B {Br}_{3} < B l_{3} < {BF}_{3}$
d)		${BBr}_{3} < B {Cl}_{3} < B F_{3} < {Bl}_{3}$

15. Which of the following is not correct with regard to the structure of diborane?

a)		four terminal hydrogen atoms and two bridged hydrogen atoms
b)		the terminal hydrogen atoms and the boron atoms lie in a plane
c)		four two centre bonds and two three centre bonds
d)		the ${sp}^{3}$ hybrid orbitals of the boron atoms have one electron each

16. Match the lists I and II and pick the correct matching from the codes given below
$\begin{matrix} List I & List II \\ (Metal) & (ore) \\ a . Aluminium & 1. Bauxite \\ b . Copper & 2. Dolomite \\ c . Potassium & 3. Pyrites \\ d . Magnesium & 4. Pitchblende \\ e . Radium & 5. Sylvine \end{matrix}$

a)		a-1, b-3, c-4, d-5, e-2
b)		a-1, b-3, c-4, d-2, e-5
c)		a-4, b-5, c-2, d-1, e-3
d)		a-1, b-3, c-5, d-2, e-4

17. Which of the following does not exist in free form ?

a)		B $F_{3}$
b)		B ${Cl}_{3}$
c)		B ${Br}_{3}$
d)		B $H_{3}$

18. Water is oxidized to oxygen by

a)		Cl $O_{2}$
b)		KMn $O_{4}$
c)		$H_{2} O_{2}$
d)		Fluorine

19. Consider the following compounds
1. Sulphur dioxide 2. Hydrogen peroxide 3. Ozone
Among these compounds identify those that can act as bleachibng agent

a)		1 and 3
b)		2 and 3
c)		1 and 2
d)		1,2 and 3

20. In one of the following reactions HN $O_{3}$ does not behave as an oxidizing agent. Identify it.

a)		$I_{2} + 10 HN O_{3} \to 2 HI O_{3} + 10 N O_{2} + 4 H_{2} O$
b)		3Cu+8HN $O_{3} \to 3 Cu {(N O_{3})}_{2} + 2 NO + 4 H_{2} O$
c)		4Zn+10HN $O_{3} \to 4 Zn {(N O_{3})}_{2}$ +N $H_{4} N O_{3} + 3 H_{2} O$
d)		2HN $O_{3} + P_{2} O_{5} \to 2 HP O_{3} + N_{2} O_{5}$

21. The substance used in smoke screen is

a)		sodium chloride
b)		zinc phosphate
c)		calcium phosphide
d)		calcium phosphate

22. Nitrogen show different oxidation states in the range

a)		0 to +5
b)		-3 to +5
c)		-5 to +3
d)		-3 to +3

23. $H_{3} P O_{3}$ phosphorous acid is

a)		a diprotic acid
b)		a triprotic acid
c)		a monoprotic acid
d)		not acidic

24. Inorganic graphite is

a)		$B_{3} N_{3} H_{6}$
b)		$B_{3} N_{3}$
c)		SiC
d)		Fe ${(CO)}_{5}$

25. An example of a neutral oxide is

a)		NO
b)		${CO}_{2}$
c)		CaO
d)		ZnO

26. Stainless Steel contains iron and carbon along with

a)		Ni and Cr
b)		Cr and Co
c)		Co and Mn
d)		Mn and Ni

27. Amongst ${Tif}_{6}^{2 -}, {CoF}_{6}^{3 -}, {Cu}_{2} {Cl}_{2}$ and ${NiCl}_{4}^{2 -}$ (At. Nos. Ti = 22, Co = 27, Cu = 29, Ni = 28). The colourless species are

a)		${CoF}_{6}^{3 -}$ and ${NiCl}_{4}^{2 -}$
b)		${Tif}_{6}^{2 -}$ and ${CoF}_{6}^{3 -}$
c)		${Cu}_{2} {Cl}_{2}$ and ${NiCl}_{4}^{2 -}$
d)		${Tif}_{6}^{2 -}$ and ${Cu}_{2} {Cl}_{2}$

28. If an aqueous solution of KCN is added to a solution of ferrous salt, then the complex formed is represented by

a)		[Fe(CN $)_{6}]^{4 -}$
b)		[Fe(CN $)_{6}]^{3 -}$
c)		[Fe( $H_{2}$ O $)_{6}]^{3 +}$
d)		[Fe( $H_{2}$ O $)_{6}]^{2 +}$

29. Which of the following compounds turn black on addition of ${NH}_{4} OH$ ?

a)		${PbCl}_{2}$
b)		${H g_{2} Cl}_{2}$
c)		${HgCl}_{2}$
d)		AgCl

30. Which of the following types of metals make the most efficient catalysts?

a)		Transition metals
b)		Alkali metals
c)		Alkaline earth metals
d)		Coloured metals

31. The common oxidation states of Ti are

a)		+2, +3
b)		+3, +4
c)		-3, -4
d)		+2, +3, +4

32. Coinage metals show the properties of

a)		Typical elements
b)		Normal elements
c)		Transitional elements
d)		Inert elements

33. Finely divided iron combines with CO to give

a)		Fe(CO $)_{5}$
b)		F $e_{2}$ (CO $)_{9}$
c)		F $e_{3}$ (CO $)_{12}$
d)		Fe(CO $)_{6}$

34. The highest magnetic moment is shown by the transition metal ion with outer electronic configuration

a)		${3 d}^{2}$
b)		${3 d}^{5}$
c)		${3 d}^{7}$
d)		${3 d}^{9}$

35. Excess of sodium hydroxide reacts with zinc to form

a)		${ZnH}_{2}$
b)		${Na}_{2} {ZnO}_{2}$
c)		ZnO
d)		Zn(OH $)_{2}$

36. Galvanisation of iron sheets is done by

a)		Cu Plating
b)		Zn Plating
c)		Ag Plating
d)		Tin Plating

37. Non - formation of meniscus by Hg in presence of $O_{3}$ is due to the formation of

a)		Mercuric oxide
b)		Mercurous oxide
c)		Mercuric chloride
d)		Mercurous chloride

38. Cuprous ion is colourless, while cupric ion is coloured because

a)		Both have unpaired electrons in the d-subshell
b)		Cuprous ion has a complete d- subshell and cupric ion has an incomplete d-subshell
c)		Both have half-filled p-and d- subshell
d)		Cuprous ion has incomplete d-subshell and cupric ion has a complete d-subshell

39. When copper reacts with hot and concentrated ${HNO}_{3}$ ,the products are

a)		${NH}_{4} {NO}_{3} + {NO}_{2} + H_{2} O$
b)		Cu(N $O_{3})_{2} + NO + H_{2} O$
c)		Cu(N $O_{3})_{2} + N_{2} O + H_{2} O$
d)		Cu(N $O_{3})_{2} + {NO}_{2} + H_{2} O$

40. Which of the following is the life saving mixture for an asthma patient?

a)		Mixture of helium and oxygen
b)		Mixture of neon and oxygen
c)		Mixture of xenon and nitrogen
d)		Mixture of argon and oxygen

41. Hybridization and structure of ${XeF}_{4}$ is

a)		${sp}^{3} d,$ trigonal bipyramidal
b)		${sp}^{3},$ tetrahedral
c)		${sp}^{3} d^{2},$ square planar
d)		${sp}^{3} d^{2},$ hexagonal

42. The most abundant inert gas in the atmosphere is

a)		He
b)		Ne
c)		Ar
d)		Kr

43. If ionization potential for hydrogen atom is 13.6 eV , then ionization potential for H $e^{+}$ will be

a)		54.4 eV
b)		6.8 eV
c)		13.6 eV
d)		24.5 eV

44. Among noble gases (from He to Xe) only xenon reacts with fluorine to form stable xenon fluorides because xenon

a)		has the largest size
b)		has the lowest ionization enthalpy
c)		has the highest heat of vapourization
d)		is the most readily available noble gas

45. Helium - Oxygen mixture is used by deep sea divers in preference to nitrogen - oxygen mixture because

a)		Helium is much less soluble in blood than nitrogen
b)		Nitrogen is much less soluble in blood than helium
c)		Due to high pressure deep under the sea nitrogen and oxygen react to give poisonous nitric oxide
d)		Nitrogen is highly soluble in water

46. Fluorine is a better oxiding agent than ${Br}_{2.}$ It is due to

a)		Small size of fluorine
b)		More electron repulsion in fluorine
c)		More electronegativity of fluorine
d)		Non metallic nature of flourine

47. Which of the following hydrogen halide has the highest boiling point ?

a)		HF
b)		HCl
c)		HBr
d)		Hl

48. Bicaching powder reacts with a few drops of conc. HCl to give

a)		Chlorine
b)		Hypochlorous acid
c)		Calcium oxide
d)		Oxygen

49. Sodium thiosulphate ( ${Na}_{2} S_{2} O_{3} {5 H}_{2} O)$ is used in photography to

a)		convert silver bromide to mettalic silver
b)		convert mettalic silver to silver salt
c)		Remove undecomposed $A_{g} B_{r}$ as soluble complex
d)		Remove reduced silver

50. Sulphuric acid has great affinity for water because

a)		It hydroyses the acid
b)		It decomposes the acid
c)		Acid forms hydrates with water
d)		Acid decomposes water