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Question Bank No: 2

1. Potassium crystallizes with a

a)		face centred cubic lattice
b)		body centred cubic lattice
c)		simple cublic lattice
d)		ortho rhombic lattice

2. The intermetallic compound LiAg crystallizes in cubic lattice in which both lithium and silver have co-ordination number of eight. The crystal class is

a)		simple cube
b)		body centred cube
c)		face centred cube
d)		none of the above

3. A f.c.c. crystal contains how many atoms in each unit cell?

a)		4
b)		6
c)		3
d)		8

4. Crystals can be classifieds into ........ basic crystal habits

a)		7
b)		4
c)		14
d)		3

5. Which of the following is an example of body centered cube ?

a)		magnesium
b)		zinc
c)		copper
d)		sodium

6. Bleaching powder is obtained by the interaction of C $l_{2}$ and

a)		dry slaked lime
b)		hot Ca(OH $)_{2}$
c)		cold Ca(OH $)_{2}$
d)		conc. CaC $l_{2}$

7. The compounds of alkaline earth metals have the following magnetic nature

a)		diamagnetic
b)		paramagnetic
c)		ferromagnetic
d)		antiferromagnetic

8. The first ionisation energies of alkaline earth metals are higher than those of the alkali metals. This is because

a)		there is increase in the nuclear charge of the alkaline earth metals
b)		there is decrease in the nuclear charge of the alkaline earth metals
c)		there is no change in the nuclear charge
d)		none of the above

9. Epsom salt is

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

10. Identify the correct statement

a)		Gypsum contains a lower percentage of calcium than Plaster of Paris
b)		Gypsum is obtained by heating Plaster of Paris
c)		Plaster of Paris can be obtained by hydration of gypsum
d)		Plaster of Paris is obtained by partial oxidation of gypsum

11. White enamel of our teeth is

a)		${Ca}_{3} (P O_{4}$ $)_{2}$
b)		Ca $F_{2}$
c)		Ca ${Cl}_{2}$
d)		Ca ${Br}_{2}$

12. Which of the following is a true peroxide

a)		N $O_{2}$
b)		Mn $O_{2}$
c)		Ba $O_{2}$
d)		S $O_{2}$

13. Presence of which of the following salt increases the rate of setting of Plaster of Paris

a)		NaCl
b)		KCl
c)		BaS $O_{4}$
d)		CuS $O_{4}$

14. Among the following oxides, the one which is most basic is

a)		zinc oxide
b)		magnesium oxide
c)		aluminium oxide
d)		nitrogen pentoxide

15. Amongst the metals Be, Mg, Ca and Sr of group 2 of the periodic table, the least ionic chloride would be formed by

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

16. Which of the following is an isomer of propanal?

a)		acetone
b)		propane
c)		propanol
d)		propionic acid

17. Which of the following molecule contains asymmetric carbon atom?

a)		C $H_{3} CHClCOOH$
b)		C $H_{3} C H_{2} COOH$
c)		ClC $H_{2} C H_{2} COOH$
d)		${Cl}_{2} CHCOOH$

18. Which is the chiral molecule?

a)		C $H_{3} Cl$
b)		C $H_{2} {Cl}_{2}$
c)		CH ${Br}_{3}$
d)		CHClBrI

19. The total number of possible isomeric trimethylbenzene is

a)		2
b)		3
c)		4
d)		6

20. The least number of carbon atoms in alkane forming optical isomer is

a)		3
b)		5
c)		2
d)		7

21. Tautomerism is exhibited by

a)		(C $H_{3})_{3} CNO$
b)		(C $H_{3})_{2} NH$
c)		$R_{3} CN O_{2}$
d)		RC $H_{2} N O_{2}$

22. Which of the following compounds has zero dipole moment?

a)		cis-2-butene
b)		trans 2-butene
c)		1-butene
d)		2-methyl1-propene

23. Which of the following compounds will show metamerism?

a)		C $H_{3} CO C_{3} H_{7}$
b)		C $H_{3} S C_{2} H_{5}$
c)		C $H_{3} - O - C H_{3}$
d)		C $H_{3} - O - C_{2} H_{5}$

24. Which of the following exhibit geometrical isomerism ?

a)		C $H_{2} = CIBr$
b)		C $H_{3}$ CH=CIBr
c)		C $H_{3} CH = CC I_{2}$
d)		(C $H_{3})_{2} C = CCIBr$

25. n-Propyl alcohol and isopropyl alcohols are examples of

a)		position isomerism
b)		chain isomerism
c)		tautomerism
d)		geometrical isomerism

26. A gas which burnswith a blue flame is

a)		CO
b)		$O_{2}$
c)		$N_{2}$
d)		C $O_{2}$

27. Three centred bond is present in

a)		N $H_{3}$
b)		$B_{2} H_{6}$
c)		B ${Cl}_{3}$
d)		Al ${Cl}_{3}$

28. Water gas is produced by

a)		passing steam through a red hot coke bed
b)		saturating hydrogen with moisture
c)		mixing oxygen and hydrogen in the ration of 1 : 2
d)		heating a mixture of C $O_{2}$ and C $H_{4}$ in petroleum refineries

29. Incomplete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of

a)		carbon monoxide and water vapour
b)		carbon monoxide
c)		nitrogen dioxide
d)		sulphur dioxide

30. Nitrogen is relatively inactive element because

a)		Its atom has a stable electronic configuration
b)		It has low atomic radius
c)		its electronegativity is fairly high
d)		dissociation energy of its molecule is fairly high

31. Which acts both an oxidising as well as reducing agent?

a)		HN $O_{3}$
b)		HN $O_{2}$
c)		$H_{2} S O_{4}$
d)		HCl

32. An example of major air pollutant is

a)		$O_{2}$
b)		C $O_{2}$
c)		CO
d)		He

33. Which one of these is acidic?

a)		${Al}_{2} O_{3}$
b)		Sn $O_{2}$
c)		Pb $O_{2}$
d)		Si $O_{2}$

34. When a mixture of air and steam is passed over red hot coke, the outgoing gas is

a)		producer gas
b)		water gas
c)		coal gas
d)		none of these gases

35. Nitric acid on standing develops brownish colour which may be attributed to the presence of

a)		N $O_{2}^{+}$ ions
b)		N $O_{3}^{-}$ ions
c)		N $O_{2}$
d)		HN $O_{2}$

36. Nitrogen is essential constituent of all

a)		proteins
b)		fats
c)		proteins and fats
d)		none of these

37. Laughing gas is

a)		nitrous oxide
b)		nitric oxide
c)		nitrogen trioxide
d)		nitrogen pentoxide

38. Common oxidation state of scandium, a transition element, is/ are (Ar. no. of Sc=21)

a)		+4
b)		+1
c)		+2 and +3
d)		+4 and +1

39. The transition metals have a less tendency to form ions due to

a)		high ionisation energy
b)		low heat of hydration of ions
c)		high heat of sublimation
d)		all of the above

40. Mn $O_{4}^{-}$ on reduction in acidic medium forms

a)		Mn $O_{2}$
b)		${Mn}^{2 +}$
c)		Mn $O_{4}^{2 -}$
d)		Mn

41. When Cu reacts with AgN $O_{3}$ solution, the reaction takes place is

a)		oxidation of Cu
b)		reduction of Cu
c)		oxidation of ${Ag}^{+}$
d)		reduction of ${No}_{3}^{-}$

42. (N $H_{4})_{2}$ S $O_{4} . FeS O_{4} .6 H_{2} O$ is

a)		Mohr's salt
b)		alum
c)		blue vitriol
d)		simple salt

43. Gun metal is an alloy of

a)		Mg, Sn, Zn
b)		Cu, Ni, Zn
c)		cu, Sn, Zn, Pb
d)		Cu, Sb, Zn, Pb

44. Corrosion of iron can be prevented by coating the surface with

a)		Zn
b)		Sn
c)		Ni
d)		Any of the above

45. Bordeaux used as fungicide is a mixture of

a)		CuS $O_{4}$ +Ca(O $H)_{2}$
b)		C4S $O_{4}$ +Cu(O $H)_{2}$
c)		CuC $O_{3}$ +Cu(O $H)_{2}$
d)		CuO + CaO

46. The blue complex formed on addition of conc. N $H_{4} OH$ solution to a ${Cu}^{2 +}$ salt solution has the structure?

a)		[Cu(N $H_{4})_{4}]^{2 +}$
b)		[Cu(N $H_{3})_{2}]^{2 +}$
c)		[Cu(N $H_{3})_{4}]^{2 +}$
d)		[Cu(N $H_{4})_{2}]^{2 +}$

47. Actinides

a)		are all synthetic elements
b)		include element 104
c)		have only short lived isotopes
d)		have variable valency

48. Which one of the following compounds does not decolourise an acidified aqueous solution of KMn $O_{4}$ ?

a)		sulphur dioxide
b)		ferric chloride
c)		hydrogen peroxide
d)		ferrous sulphate

49. Potassium manganate ( $K_{2} Mn O_{4})$ is formed when

a)		chlorine is passed into aqueous KMn $O_{4}$ solution
b)		manganese dioside is fused with potassium hydroxide in air
c)		formaldehyde reacts with potassium permanganate in presence of a strong alkali
d)		potassium permanganate reacts with concentrated sulphuric acid

50. Which one of the following shows highest magnetic moment?

a)		$V^{3 +}$
b)		${Cr}^{3 +}$
c)		${Fe}^{3 +}$
d)		${Co}^{3 +}$