Untitled Document

Question Bank No: 5

1. P has an oxidation state of +3 in

a)		orthophosphoric acid
b)		phosphorous acid
c)		metaphosphoric acid
d)		pyrophosphoric acid

2. The oxidation number of ${CH}_{2} O$ is

a)		$- 2$
b)		+2
c)		0
d)		+4

3. Which of the following is not a redox reaction?

a)		${CaCO}_{3} \to CaO + {CO}_{2}$
b)		$O_{2} + 2 H_{2} \to 2 H_{2} O$
c)		$Na + H_{2} O \to NaOH + \frac{1}{2} H_{2}$
d)		${MnCl}_{3} \to {MnCl}_{2} + \frac{1}{2} {Cl}_{2}$

4. In $H_{2} O_{2}$ the oxidation state of oxygen is

a)		-2
b)		-1
c)		0
d)		+4

5. The oxidation number of iron in ${Fe}_{3} O_{4} is$

a)		+2
b)		+3
c)		$\frac{8}{3}$
d)		$\frac{2}{3}$

6. Number of moles of $K_{2} {Cr}_{2} O_{7} reduced by one mole {Sn}^{2 +} ions is$

a)		$\frac{1}{3}$
b)		3
c)		$\frac{1}{6}$
d)		6

7. Which one of the following has highest boiling point

a)		0.1 M glucose
b)		0.1 M ${BaCl}_{2}$
c)		0.1 M NaCl
d)		0.1 M urea

8. Which of the following has highest freezing point?

a)		0.1 M NaCl
b)		0.1 M Sugar
c)		0.1 M ${BaCl}_{2}$
d)		0.1 M ${FeCl}_{3}$

9. If 18 g of glucose is present in 1000g of a solvent it is said to be

a)		1 molal
b)		1.1 molal
c)		0.5 molal
d)		0.1 molal

10. Molarity of pure water is

a)		55.6
b)		50
c)		100
d)		18

11. Which of the following is not a colligative property?

a)		$Δ T_{f}$
b)		$π$
c)		$Δ T_{b}$
d)		$K_{b}$

12. Which of the following method is used for measuring the osmotic pressure of the solution?

a)		Ostwald method
b)		Berkely Hartley
c)		Solvay method
d)		Haber's method

13. The concentration units independent of temperature would be

a)		normality
b)		mass-volume percent
c)		molality
d)		molarity

14. The relationship between osmotic pressure at 273 K when 10 g glucose ( $P_{1}),$ 10g urea ( $P_{2})$ and 10g sucrose ( $P_{3})$ are dissolved in 250 ml of water is

a)		$P_{1} > P_{2} > P_{3}$
b)		$P_{3} > P_{1} > P_{2}$
c)		$P_{2} > P_{1} > P_{3}$
d)		$P_{2} > P_{3} > P_{1}$

15. A 5% solution of cane sugar is isotonic with 1% solution of substance X. Molecular weight of X is

a)		171.2
b)		68.4
c)		34.2
d)		136.2

16. For a 1 molar solution of NaCl in water at $25^{0} C$ and 1 atm pressure

a)		molality = normality
b)		molarity = normality
c)		molality = mole fraction
d)		molarity = mole fraction

17. In a mixture of A and B compounds show negative deviation as

a)		$Δ V_{mix} > 0$
b)		$Δ H_{mix} < 0$
c)		A-B interaction is weaker than A-A and B-B interaction
d)		None of the above reason is correct

18. An aqueous solution freezes at $- {0.186}^{0} C$ ( $K_{f} = 1.86, K_{b} = 0.512)$ What is the elevation in boiling point?

a)		$0.186$
b)		0.512
c)		0.8
d)		0.0512

19. The nuclear reaction, ${}_{1}^{2}H + {}_{1}^{2}H \to {}_{1}^{3}H + energy$ , is called

a)		Fusion
b)		Fission
c)		Chain reaction
d)		Spontaneous reaction

20. What is X in the nuclear reaction, ${}_{7}^{14}N + {}_{1}^{1}H \to {}_{8}^{15}O + X$

a)		proton
b)		neutron
c)		$γ$
d)		positron

21. From the reaction given below deduce the group of polonium in the periodic table. (Pb belongs to group 14) ${}_{84}^{210}{Po} \to {}_{82}^{206}{Pb} + {}_{2}^{4}{He}$

a)		2
b)		14
c)		6
d)		16

22. In the nuclear reaction, ${}_{92}^{238}U \to {}_{82}^{206}{Pb},$ the number of $α and β$ particles emitted are

a)		7 $α, 5 β$
b)		6 $α, 4 β$
c)		4 $α, 3 β$
d)		8 $α, 6 β$

23. Which of the following is used as neutron absorber in the nuclear reactor

a)		water
b)		deuterium
c)		compound of uranium
d)		cadmium

24. Energy released in the nuclear fusion reaction, ${}_{1}^{2}H + {}_{1}^{3}H \to {}_{2}^{4}{He} + {}_{0}^{1}n,$ atomic mass of ${}_{1}^{2}H = 2.014; {}_{1}^{3}H = 3.016; {}_{2}^{4}{He} = 4.003; {}_{0}^{1}n = 1.009 (all in amu)$

a)		16.6 MeV
b)		500 J
c)		$4 \times 10^{6} kcal$
d)		8.3 eV

25. Which is not emitted by radioactive substance?

a)		$α$
b)		$β$
c)		positron
d)		proton

26. Which element is the end product of every natural radioactive series?

a)		Pb
b)		Sn
c)		C
d)		Bi

27. Radioactive decay, which one of the following moves the fastest?

a)		$α$
b)		$β$
c)		$γ$
d)		positron

28. What will be the half life period of nucleus if at the end of 4.2 days, N=0.798 $N_{0} (\log 1.25 = 0.09)$

a)		15 days
b)		10 days
c)		12.83 days
d)		20 days

29. Isobar of a nucleide is formed when ................ takes place

a)		1 $α emission$
b)		1 $β emission$
c)		1 $α and 1 β emission$
d)		2 $α and 1 β emission$

30. If ${}_{a}^{b}X emits firstly a$ positron, then 2 $α$ and 2 $β$ and in the last $α$ is emitted and finally it changes to ${}_{d}^{c}Y .$ The correct relation is

a)		a = c +12, d = b-5
b)		a = c+8, d = b-1
c)		a = c+6, d = b-2
d)		a = c+4, d = b-2

31. In the case of a radioisotope, the value of $t_{1 / 2} and λ$ are identical in magnitude. The value is

a)		1/0.693
b)		$(0.693)^{2}$
c)		0.693
d)		$(0.693)^{1 / 2}$

32. The reactor used to convert stable form to fissile form is

a)		chemical reactor
b)		nuclear reactor
c)		breeder reactor
d)		atomic reactor

33. The first artificial disintegration of an atomic nucleus was achieved by

a)		Geiger
b)		Wilson
c)		Madame Curie
d)		Rutherford

34. Which of the following is not a colloid?

a)		Chlorophyll
b)		Smoke
c)		Ruby Glass
d)		Milk

35. Gold number is minimum in case of

a)		Gelatin
b)		Egg albumin
c)		Gum arabic
d)		Starch

36. Which of the following will have the highest coagulation power for ${As}_{2} S_{3} colloid$

a)		${PO}_{4}^{3 -}$
b)		${SO}_{4}^{2 -}$
c)		${Al}^{3 +}$
d)		${Na}^{+}$

37. In colloidal state, particle size ranges from

a)		1 to 10 $Å$
b)		20 to 50 $Å$
c)		10 to 1000 $Å$
d)		1 to 280 $Å$

38. When a colloidal solution is observed under an ultra microscope, we can see

a)		light scattered by colloidal particles
b)		size of the particle
c)		shape of the particle
d)		none of the above

39. In the hydrogenation of oils, the catalyst used is

a)		iron
b)		platinum
c)		nickel
d)		molybdenum

40. Enzymes are

a)		micro-organism
b)		proteins
c)		inorganic compounds
d)		moulds

41. Which one among the following sols is hydrophobic?

a)		gum
b)		gelatin
c)		starch
d)		sulphur

42. Which of the following is less than zero during adsorption?

a)		$Δ G$
b)		$Δ S$
c)		$Δ H$
d)		all the above

43. For adsorption of a gas on a solid, the plot of log x/m v/s log P is linear with slope equal to

a)		k
b)		log k
c)		n
d)		1/n

44. Which is adsorbed to maximum amount by activated charcoal?

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

45. Cellulose dispersed in ethanol is called

a)		Emulsion
b)		Micelle
c)		Collodion
d)		Hydrophilic son

46. Lyophillic colloids are stable due to

a)		charge on the particle
b)		large size of the particle
c)		small size of the particle
d)		due to extensive solvation

47. Adsorption is multilayer in the case of

a)		physical adsorption
b)		chemical adsorption
c)		both
d)		none of both

48. The heat of adsorption in physical adsorption lies in the range (in kJ/mol)

a)		40 - 400
b)		40 - 100
c)		10 - 40
d)		200 - 400

49. Alum helps in purifying water by

a)		forming Si complex with clay particles
b)		sulphate part which combines with dirt and removes it
c)		aluminium coagulates the mud particle
d)		making mud water soluble

50. In the case autocatalyses

a)		reactant catalyses
b)		heat produced in the reaction catalyses
c)		product catalyses
d)		solvent catalyses