Solved Paper Assistant Chemist 2018 [Part-1] – HPSSC Hamirpur

Post Code: 638

Series: A

1. Which of the following terms is unitless?

1. Molality
2. Molarity
3. Mole fraction
4. None of these

2. The number of water molecules is maximum in

1. 1.8 g of water
2. 18 g of water
3. 18 moles of water
4. 18 molecules of water

3. Electromagnetic radiation with maximum wavelength is

1. Ultraviolet
2. Radio wave
3. X-ray
4. Infrared

4. Which has the maximum negative electron gain enthalpy?

1. Chlorine
2. Bromine
3. Iodine
4. Fluorine

5. The smallest ion among the following is

1. Na⁺
2. Mg²⁺
3. Al³⁺
4. Si⁴⁺

6.The pyramidal geometry is associated with

1. CH₄
2. NH₃
3. H₂O
4. CO₂

7. Which of the following does not have hydrogen bond?

1. Phenol
2. Liquid NH₃
3. Water
4. HCl

8. A gas can be liquefied

1. Above its critical temperature
2. At its critical temperature
3. Below its critical temperature
4. At any temperature

9. When the temperature is increased, the surface tension of water

1. Decreases
2. Increases
3. Remains constant
4. Shows irregular behaviour

10. The root means square velocity of an ideal gas at constant pressure varies with density(d) as

1. d
2. d²
3. √ d
4. 1/ √ d

11. Diamond is

1. A covalent solid
2. Non-conductor
3. A lubricant
4. All of these

12. In the evaporation of water, the entropy

1. decreases
2. increases
3. does not change
4. All of these

13. The enthalpies of all the elements in their standard states are

1. Unity
2. Zero
3. Positive
4. Negative

14. The degree of dissociation in a weak electrolyte increases

1. On increasing pressure
2. On decreasing dilution
3. On increasing dilution
4. On increasing concentration

15. The strongest conjugate base is

1. NO₃^–
2. Cl^–
3. SO₄^2-
4. CH₃COO^–

16.The reducing agent is a substance which can

1. Accept electrons
2. Donate electrons
3. Accept protons
4. Donate protons

17. The oxidation state of nitrogen in N₃H is

1. +1/2
2. +3
3. -1
4. -1/3

18. The volume strength of 1.5 N H₂O₂ solution is

1. 3.0
2. 4.8
3. 8.0
4. 8.4

19. The reagent used for softening the temporary hardness of water is

1. Ca(OH)₂
2. Na₂CO₃
3. Both (A) and (B)
4. None of these

20. An ingredient of baking powder is

1. NaHCO₃
2. Na₂CO₃
3. Na₂SO₄
4. NaCl

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

1. Oxidising agents
2. Lewis bases
3. Reducing agents
4. Electrolytes

22. Orthophosphoric acid on heating gives

1. Metaphosphoric acid
2. Phosphine
3. Phosphorus pentoxide
4. Phosphorus acid

23. Nucleophile is a species that should have

1. A pair of electrons to donate
2. Positive charge
3. Negative charge
4. Both (A) and (C)

24. A mixture of naphthalene and oxalic acid can be separated by

1. Chromatography
2. Sublimation
3. Fractional Crystallisation
4. Distillation

25. Alicyclic compounds are

1. Aromatic compounds
2. Aliphatic cyclic compounds
3. Heterocyclic compounds
4. None of these

26. The purity of an organic solid is determined by

1. Density
2. Melting point
3. Mixed melting point
4. Molecular mass

27. Which of the following is a non-benzenoid aromatic compound?

1. Aniline
2. Benzoic acid
3. Anthracene
4. Tropolone

28. The gas which reacts with haemoglobin in blood is

1. CO
2. SO₂
3. CO₂
4. NO

29. Which of the following is an amorphous acid?

1. Graphite
2. Quartz glass (SiO₂)
3. Chrome alum
4. Silicon carbide

30. Which of the following unit cells is the most unsymmetrical?

1. Triclinic
2. Orthorhombic
3. Monoclinic
4. Hexagonal

31. Isotonic solutions must have the same

1. Solute
2. Density
3. Elevation in boiling point
4. None of these

32. The mole fraction of a solute in benzene solvent is 0.2. the molality of the solution will be

1. 1.4
2. 2.0
3. 3.2
4. 14.0

33. The cell constant of a conductivity cell changes with change of

1. Electrolyte
2. Concentration of electrolyte
3. Temperature of electrolyte
4. None of these

34. A smuggler could not carry gold by depositing iron on gold surface because

1. Gold is denser
2. Irun rusts
3. Gold has higher reduction potential that iron
4. Gold has lower reduction potential that iron

35. In a salt bridge, KCl is used because

1. It is an electrolyte
2. It is a good conductor of electricity
3. It forms a good jelly with agar-agar
4. All of these

36. In the presence of a catalyst, the heat evolved or absorbed during the reaction

1. Increases
2. Decreases
3. Remains unchanged
4. None of these

37. If 60% of first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately

1. 45 minutes
2. 60 minutes
3. 40 minutes
4. 50 minutes

38. Half-life period is independent of initial concentration of reactant of

1. First order reaction
2. Second order reaction
3. Zero order reaction
4. Third order reaction

39. Which of the following processes is responsible for the formation of delta at a place where rivers meet the sea?

1. Emulsification
2. Colloid formation
3. Coagulation
4. Peptization

40. Action of shape selective catalyst depends upon

1. Mass
2. Solubility
3. Particle size
4. None of these

41. Which of the following colloids cannot be easily coagulated?

1. Multimolecular colloids
2. Irreversible colloids
3. Lycophillic colloids
4. Macromolecular colloids

42. Which of the following is not a surface phenomenon?

1. Heterogeneous catalysis
2. Corrosion
3. Fusion of solids
4. Electrolysis process

43. Which of the following is not an ore of iron?

1. Limonite
2. Magnetite
3. Caniterite
4. None of these

44. Which of the following methods is not used for refining of metals?

1. Poling
2. Cupellation
3. Smelting
4. None of these

45. Basicity of ortho phosphoric acid is

1. 2
2. 3
3. 4
4. 5

46. Which of the following has maximum boiling point?

1. Krypton
2. Xenon
3. Helium
4. Neon

47. Which of the listed oxidation states is common for all lanthanoids?

1. +2
2. +3
3. +4
4. +5

48. Sodium thiosulphate is used in photography because of its

1. Oxidizing nature
2. Reducing nature
3. Complexity nature
4. Photochemical nature

49. The colour of the co-ordination compounds is explained in terms of

1. Spectrochemical series
2. Chelate effect
3. Crystal field theory
4. None of these

50. IUPAC name of (CH₃CH₂CO)₂O is

1. Propionic anhydride
2. Dipropanoic anhydride
3. Ethoxypropanoic   acid
4. Propanoic acid

51. How many chiral compounds are possible on monochlorination of 2-methylbutane?

1. 4
2. 6
3. 8
4. None of these

52. Which of the following phenols, is the strongest?

1. p-chlorophenol
2. m-nitrophenol
3. p-nitrophenol
4. o-nitrophenol

53. The compound which gives both iodoform and Fehling tests among the following is

1. Ethanol
2. Propanone
3. Butane-2-ol
4. Ethanal

54. The acids which do not contain a –COOH group are

1. Propionic acid
2. Picric acid
3. Carbolic acid
4. Both (B) and (C)

55. Piperidine is

1. Homocyclic compound
2. Heterocyclic aromatic compound
3. Heterocyclic alicyclic compound
4. Acyclic compound

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