Untitled Document

Question Bank No: 1

1. Which of the following is used in weather balloons and air ships?

a)		Argon
b)		Krypton
c)		Helium
d)		Neon

2. Pt $F_{6}$ is a

a)		Good oxidising agent
b)		good reducing agent
c)		poor oxidising agent
d)		poor reducing agent

3. The noble gas which shows abnormal behaviour in liquid state and behaves as a superfluid is

a)		Argon
b)		Neon
c)		Helium
d)		Xenon

4. Which pair represents halogen acid with longest bond length and the one with highest bond energy respectively?

a)		HI, HBr
b)		HCl, HF
c)		HI, HF
d)		HBr, HCl

5. The collective name given to be elements of group 17 of periodic table is

a)		Chalcogens
b)		Halogens
c)		Pnicogens
d)		Ferrogens

6. The high value of $Δ$ $H_{vap}$ of ammonia is attributed to its

a)		Basic nature
b)		Association due to H bonding
c)		Shape
d)		Covalent nature of N $-$ H bonds

7. Which of the following processes is helpful in separation of white phosphorus from red phosphorus?

a)		Sublimation
b)		Distillation
c)		Treatment with ${CS}_{2}$
d)		Heating in air

8. Which of the following molecule involves the formation of d $π -$ p $π$ bonding?

a)		Trimethyl amine
b)		Carbon monoxide
c)		Trisilyl amine
d)		$C_{3}$ ${(OH)}_{3}$

9. Which of the following substances is soluble in NaOH solution?

a)		Cr ${(OH)}_{3}$
b)		Fe ${(OH)}_{3}$
c)		Al ${(OH)}_{3}$
d)		Cu ${(OH)}_{2}$

10. Diborane on hydrolysis yields

a)		$B_{2}$ $O_{3}$
b)		$H_{3}$ B $O_{3}$
c)		HB $O_{2}$
d)		$H_{2}$ $O_{3} O_{7}$

11. Which of the following is not a mineral of aluminium?

a)		Cryolite
b)		Mica
c)		Feldspar
d)		Fluorspar

12. Which of the following carbides, on hydrolysis, yields methane?

a)		${Be}_{2}$ C
b)		Mg $C_{2}$
c)		Ca $C_{2}$
d)		${Mg}_{2} C_{3}$

13. Which of the following is most soluble in water?

a)		CaS $O_{4}$
b)		SrS $O_{4}$
c)		MgS $O_{4}$
d)		BaS $O_{4}$

14. Which of the following hydroxides is most basic?

a)		Mg ${(OH)}_{2}$
b)		Ca ${(OH)}_{2}$
c)		Sr ${(OH)}_{2}$
d)		Ba ${(OH)}_{2}$

15. Which of the following halides has the maximum covalent character?

a)		CsI
b)		KI
c)		NaI
d)		LiI

16. Which of the following compounds liberates ${CO}_{2}$ on heating?

a)		${Li}_{2}$ C $O_{3}$
b)		${Na}_{2}$ ${CO}_{3}$
c)		$K_{2}$ ${CO}_{3}$
d)		All liberate ${CO}_{2}$ on heating

17. The correct order of ionization energies of alkali metals is

a)		Li > Na > K > Rb
b)		Na > K > Rb > Li
c)		Rb > K > Na > Li
d)		Rb > K > Li > Na

18. The polarity is maximum in

a)		N-F
b)		C-F
c)		O-F
d)		F-F

19. The coloured discharge tubes for advertisements contain

a)		Argon
b)		Xenon
c)		Helium
d)		Neon

20. Which of the following is the most powerful oxidizing agent?

a)		$F_{2}$
b)		${Cl}_{2}$
c)		${Br}_{2}$
d)		$I_{2}$

21. Which of the following on thermal decomposition yields a basis as well as acidic oxide?

a)		KCl $O_{3}$
b)		${Na}_{2} {CO}_{3}$
c)		Ca ${CO}_{3}$
d)		Na ${NO}_{2}$

22. For which one of the following minerals, the composition given is incorrect?

a)		Glauber's salt - ${Na}_{2} {SO}_{4} .10 H_{2} O$
b)		Borax - ${Na}_{2} {B_{4} O}_{7} .7 H_{2} O$
c)		Camallite- $KCl . Mg {Cl}_{2} .5 H_{2} O$
d)		Soda ash - ${Na}_{2} {CO}_{3}$

23. The crystalline salt ${Na}_{2} {SO}_{4} . x H_{2} O$ on heating loses 55.9% of its weight. The formula of crystalline salt is

a)		${Na}_{2} {SO}_{4} .5 H_{2} O$
b)		${Na}_{2} {SO}_{4} .7 H_{2} O$
c)		${Na}_{2} {SO}_{4} .10 H_{2} O$
d)		${Na}_{2} {SO}_{4} .6 H_{2} O$

24. The carbonate that will have not decompose on heating is

a)		${Na}_{2} {CO}_{3}$
b)		Ca ${CO}_{3}$
c)		Ba ${CO}_{3}$
d)		Sr ${CO}_{3}$

25. Pick out the statement(s) which is (are) not true about the diagonal realtionship of Li and Mg
a) Polarising powers of ${Li}^{+}$ and ${Mg}^{+ 2}$ are almost same
b) Like Li, Mg decomposes water very fast
c) LiCl and Mg ${Cl}_{2}$ are deliquescent
d) Like Li, Mg readily reacts with liquid bromine at ordinary temperature

a)		a and d
b)		b and c
c)		only a
d)		b and d

26. Dead burnt plaster is

a)		CaS $O_{4} .2 H_{2} O$
b)		MgS $O_{4} .7 H_{2} O$
c)		CaS $O_{4} . H_{2} O$
d)		CaS $O_{4}$

27. When electric current is passed through an ionic hydride in molten state

a)		hydrogen is liberated at anode
b)		hydrogen is liberated at cathode
c)		no change takes place
d)		hydride ion migrates towards cathode

28. Which of the following statements about alkaline earth metals are correct?
1. Hydration energy of ${Sr}^{2 +}$ is greater than that of ${Be}^{2 +}$
2. CaC $O_{3}$ decomposes at a higher temperature than BaC $O_{3}$
3. Ba ${(OH)}_{2}$ is a stronger base than Mg ${(OH)}_{2}$
4. SrS $O_{4}$ is less soluble in water than CaS $O_{4}$
Select the correct answer using the code given below

a)		4 only
b)		1 and 3
c)		1 and 4
d)		3 and 4

29. A substance 'A' on heating gives a colourless gas. The residue is dissolved in water to form 'B'. When excess ${CO}_{2}$ is bubbled through a solution of 'B', 'C' is formed. 'C' on gentle heating reforms 'A'. The substance 'A' is

a)		calcium carbonate
b)		sodium carbonate
c)		potassium carbonate
d)		calcium nitrate

30. 2gm of Aluminium is treated separately with excess of dilute $H_{2} S O_{4}$ and excess of NaOH, the ratio of volume of hydrogen evolved is

a)		1:1
b)		2:3
c)		1:2
d)		2:1

31. The H-O-O bond angle in $H_{2}$ $O_{2}$ is

a)		${107.28}^{o}$
b)		${109.28}^{o}$
c)		$106^{o}$
d)		$97^{o}$

32. Alkali metals have high oxidation potential and hence they behave as

a)		oxidizing agents
b)		lewis bases
c)		reducig agents
d)		electrolytes

33. The effective component of bleaching powder is

a)		${OCl}_{2}^{2 -}$
b)		OC $l^{-}$
c)		$O^{2 -}$
d)		${Cl}^{-}$

34. The reaction of slaked lime with ${Cl}_{2}$ gas gives

a)		Only Ca(OCl $)_{2}$
b)		Only ${CaCl}_{2}$
c)		A mixture of Ca(OCl $)_{2,}$ Ca(OH $)_{2}$ $, {CaCl}_{2}$ and $H_{2} O$
d)		Quick lime

35. Bleaching powder loses its power on keeping for a long time because

a)		It changes into calcium hypochlorate
b)		It changes into ${CaCl}_{2}$ and Ca(OH $)_{2}$
c)		It absorbs moisture
d)		It changes into calcium chloride and calcium chlorate

36. The difference of eater molecules in gypsum and Plaster of Paris is

a)		$\frac{5}{2}$
b)		2
c)		$\frac{1}{2}$
d)		1 $\frac{1}{2}$

37. A metal is burnt in air and the ash on moistening smells of ammonia. The metal is

a)		Na
b)		Fe
c)		Mg
d)		Al

38. Sodium sulphate is solute in water but barium sulphate is insoluble because

a)		the hydration energy of N $a_{2}$ is more than its lattice energy
b)		the lattice energy of BaS $O_{4}$ is more than its hydration energy
c)		the lattice energy has no role to play in solubility
d)		Both A and B

39. Which of the following alkaline earth metals is the strongest reducing agent?

a)		Ca
b)		Sr
c)		Ba
d)		Mg

40. To a clear solution of compound (X) a solution of BaC $l_{2}$ is added and a heavy white precipitate is formed which does not dissolve in dilute HCl.The compound X is

a)		a nitrate
b)		a bromide
c)		a sulphate
d)		a carbonate

41. Lithium is strongest reducing agent among alkali metals due to which of the following factor?

a)		Ionization energy
b)		Electron affinity
c)		Hydration energy
d)		Lattice energy

42. Solution of sodium metal in liquid ammonia is strongly reducing due to the presence in the solution of the following

a)		Sodium hybride
b)		Sodium amide
c)		Sodium atoms
d)		Solvated electrons

43. When a substance A reacts with water it produces a combustible gas B and a solution of a substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B even on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. A,B,C and D respectively are

a)		Na, $H_{2}, NaOH$ and Zn
b)		K, $H_{2}, KOH$ and Al
c)		Ca. $H_{2}, Ca (OH)_{2}$ and Sn
d)		${CaC}_{2}, C_{2} H_{2,} Ca (OH)_{2}$ and Fe

44. Which one of the elements reacts directly with nitrogen to form nitride?

a)		Li
b)		Ba
c)		K
d)		Rb

45. The strongest reducing agent out of Na, K, Rb and Cs is

a)		Na
b)		Cs
c)		Rb
d)		K

46. Sodium is made by the electrolysis of a molten mixture of about 40% NaCl and 60% Ca ${Cl}_{2}$ because

a)		Ca ${Cl}_{2}$ helps in conduction of electricity
b)		This mixture has a lower melting point than NaCl
c)		${Ca}^{+ +}$ can displace Na from NaCl
d)		${Ca}^{+ +}$ can reduce NaCl to Na

47. Which of the following reacts with water at a high rate ?

a)		Li
b)		K
c)		Na
d)		Rb

48. Which of the following statements is false regarding saline hydrides?

a)		In the molten state they conduct electricity
b)		They dissolve in water giving off hydrogen
c)		They are used as reducing agents
d)		They are covalent in nature

49. Which of the following statements is false for alkali metals?

a)		Lithium is the strongest reducing agent
b)		Sodium is amphoteric in nature
c)		${Li}^{+}$ is exceptionally small
d)		All alkali metals give blue solution in liquid ammonia

50. Which of the following does not illustrate the anomalous properties of Li?

a)		The m.p and b.p of Li are comparatively high
b)		Li forms a nitride ${Li}_{3} N$ unlike group 1 metals
c)		Li is much softer than the other 1 group metals
d)		${Li}^{+}$ ion and its compounds are more heavily hydrated than those of the rest of the group