30 objective type questions on Chemistry for Orissa Joint Entrance Exam.
Ques. One mole of potassium dichromate completely oxidises the following number of moles of ferrous sulphate in acidic medium
(a) 1
(b) 3
(c) 5
(d) 6
Ques. Which of the following is a lypophobic colloid
(a) Starch solution
(b) Gum solution
(c) Protein solution
(d) Arsenic sulphide solution
Ques. A mixture of sand and iodine can be separated by
(a) Crystallisation
(b) Sublimation
(c) Distillation
(d) Fractional distillation
Ques. Why is gelatine used in the preparation of ice-creams?
(a) To prevent the formation of colloid
(b) To stabilize the colloid and to prevent the formation of crystals
(c)
(d) To make it fragrant
Ques. Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon
(a) 3s
(b) 2p
(c) 2s
(d) 1s
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Ques. A colloidal system, in which bubbles of a gas are dispersed in a liquid, is called
(a) Lather
(b) Sol
(c) Aerosol
(d) Emulsion
Ques. van’t Hoff’s factor for 0.1M Ba(NO3)2 solution is 2.74, then the amount of dissociation will be
(a) 91.3%
(b) 87%
(c) 100%
(d) 74%
Ques. Calculated value of 10% (w/w) acetic acid is 1.850, therefore it is
(a) Normal
(b) Molar
(c) Molal
(d) Formal
Ques. Which of the following should be formed on hydrolysis of ethyl isocyanide?
(a) An acid + A 2° amine
(b) Ethyl alcohol + Formic acid
(c) A primary amine + The simplest alkanoic acid
(d) The simplest amine + Formic acid
Ques. Which of the following compounds on ozonolysis gives a mixture of two products, both of which can undergo Cannizzaro’s reaction?
(a) Cumine
(b) Styrene
(c) Cinnamaldehyde
(d) cinnamic acid
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Ques. Which of the following names is not acceptable for urea?
(a) Aminoformamide
(b) Carbonamide
(c) Aminomethanamide
(d) Carbamide
Ques. If electron, hydrogen, helium and neon nuclei are all moving with the velocity of light, then the wavelengths associated with these particles are in the order
(a) Electron > hydrogen > helium > neon
(b) Electron > helium > hydrogen > neon
(c) Electron < hydrogen < helium < neon
(d) Neon < hydrogen < helium < electron
Ques. Which of the following is a suitable test for nitrobenzene?
(a) Carbylamine test
(b) Liebermann test
(c) Lucas test
(d) Mulliken and Barker test
Ques. Nature of the bond formed between two elements depends on the
(a) Oxidation potential
(b) Electronegativity
(c) Ionization potential
(d) Electron affinity
Ques. Which of the following type of isomerism can be exhibited by 2-Methylbutanoic acid with other compounds
[A] Function group isomerism
[B] Position isomerism
[C] Chain isomerism
[D] Optical isomerism
(a) Only A, C and D
(b) A, B, C and D
(c) Only B and C
(d) Only A and D
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Ques. A 200 g cricket ball is thrown with a speed of 3 x 103 cm/sec, what will be its de Brogile wavelength
(a) 1.1 x 1032 cm
(b) 2.2 x 10–32 cm
(c) 0.55 x 10–32 cm
(d) 11.0 x 1032 cm
Ques. The energy of third orbit of Li+2 would be … the energy of first Bohr’s orbit of H-atom
(a) Equal to
(b) Four times
(c) Nine times
(d) Half of
Ques. To 5.85 gm of NaCl one kg of water is added to prepare of solution. What is the strength of NaCl in this solution (mol. wt. of NaCl = 58.5)
(a) 0.1 Normal
(b) 0.1 Molal
(c) 0.1 Molar
(d) 0.1 Formal
Ques. The hybridization state of B in B2H6 is
(a) sp
(b) sp2
(c) sp3
(d) sp3d
Ques. Two Ist order reaction have half lives in the ratio 3 : 2 Calculate the ratio of time interval t1 : t2; t1 is the time period for 25 % completion of the first reaction and t2 for 75% completion of the second reaction.
(a) 0.311 : 1
(b) 0.420 : 1
(c) 0.273 : 1
(d) 0.119 : 1
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Ques. X ml of H2 gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under identical conditions is
(a) 10 seconds : He
(b) 20 seconds : O2
(c) 25 seconds : CO
(d) 55 seconds : CO2
Ques. Which of the following cannot give iodometric titrations
(a) Fe3+
(b) Cu2+
(c) Pb2+
(d) Ag+
Ques. If half-life of a 8.0 gram of a radioactive isotope is 10 hours, then what should be the half-life of 2.0 gram of that substance
(a) 2.5 hours
(b) 5 hours
(c) 10 hours
(d) 40 hours
Ques. Number of monochloroalkane for C5H12 will be
(a) 5
(b) 6
(c) 7
(d) 8
Ques. A product is formed by the reaction of acetaldehyde and methanol in the presence of dry HCl. The same product will be formed by the reaction of methanol and which of the following compounds in the presence of mercuric ion
(a) Acetic acid
(b) Acetylene
(c) Ethylene
(d) Propyne
Ques. Carbon-halogen bond is strongest among the following
(a) CH3Cl
(b) CH3Br
(c) CH3F
(d) CH3I
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Ques. The half-life of 14C is about
(a) 12.3 years
(b) 5730 years
(c) 4.5 x 109 years
(d) 2.52 x 105 years
Ques. From the following which compound on heating readily sublimes
(a) NaCl
(b) MgCl2
(c) BaaCl2
(d) AlCl3
Ques. The concentration of which ion is to be decreased, when NH3 solution is added
(a) OH–
(b) NH4+
(c) H3O+
(d) O2–
Ques. The boiling point of benzene is 353.23 K. When 1.80 gm of a nonvolatile solute was dissolved in 90 gm of benzene, the boiling point is raised to 354.11 K. the molar mass of the solute is [Kb for benzene = 2.53 K mol–1]
(a) 5.8 gmol–1
(b) 0.58 gmol–1
(c) 58 gmol–1
(d) 0.88 gmol–1
Ques. The atomic weight of an element is 39. The number of neutrons in its nucleus is one more than the number of protons. The number of protons, neutrons and electrons respectively in its atom would be
(a) 19, 20, 19
(b) 19, 19, 20
(c) 20, 19, 19
(d) 20, 19, 20
Ques. The number of electrons that are paired in oxygen molecule is
(a) 7
(b) 8
(c) 14
(d) 16
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Ques. The compressibility of a gas is less than unity at STP. Therefore
(a) Vm > 22.4 litres
(b) Vm < 22.4 litres
(c) Vm = 22.4 litres
(d) Vm = 44.8 litres
Ques. 8 gms of a radioactive substance is reduced to after 1 hour. The of the radioactive substance is
(a) 15 min
(b) 30 min
(c) 45 min
(d) 10 min
Ques. Which of the following methods is used for sol destruction?
(a) Condensation
(b) Dialysis
(c) Diffusion through animal membrane
(d) Addition of an electrolyte
Ques. Particles of quartz are packed by
(a) Electrical attraction forces
(b) Vander Waal’s forces
(c) Covalent bond forces
(d) Strong electrostatic attraction forces
Ques. Aluminium oxide is not reduced by chemical reactions since
(a) Aluminium oxide is reactive
(b) Reducing agents contaminate
(c) Aluminium oxide is highly stable
(d) The process pollutes the environment
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Ques. Which of the following compounds involves intramolecular hydrogen bonding?
(a) Methanamine
(b) p-Nitrophenol
(c) o-Nitrophenol
(d) Ethanol
Ques. Surface tension of lyophilic sol is
(a) Less than that of water
(b) More than that of water
(c) Equal of that of water
(d) None of the above
Ques. Molal elevation constant of water is 0.513°C. When 0.1 gram sugar is dissolved in 200 gram water, then the solution will boil at which of the following temperatures, if atmospheric is one
(a) 100.256°C
(b) 100.510°C
(c) 100.05°C
(d) 101.025°C
Ques. Which of the following products can be prepared by the reaction of ethyl cyanide with an alkylmagnesium iodide?
(a) Aldehyde
(b) Secondary amine
(c) Adimine
(d) alkanone
Ques. Which of the following types of isomerism is shown by benzyl alcohol and anisole?
(a) Metamerism
(b) Functional group isomerism
(c) Chain isomerism
(d) Positional isomerism
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Ques. Clasius-Claperon equation shows relationship between
(a) Vapour pressure and density
(b) Vapour pressure and temperature
(c) Temperature and pressure
(d) None of the above
Ques. Which of the following reactions does not form salicylic acid?
(a) Permanganate oxidation of o-cresol
(b) Reimer-Tiemann carboxylation
(c) Duff reaction
(d) Kolbe-Schmidt reaction
Ques. The reaction between methyl acetate and tert-butyl alcohol is known by the name
(a) Claisen ester condensation
(b) Trans-esterification
(c) Saponification
(d) Bouveault-Blanc reaction
Ques. Equal volumes of one molar hydrochloric acid and sulphuric acid are neutralization by dil. NaOH solution and x kcal and y kcal of heat are liberated respectively. Which of the following is true?
(a) x = y
(b) x = ½ y
(c) x = 2y
(d) None of the above
Ques. If the atomic number of an element is 33, it will be placed in the periodic table in the
(a) First group
(b) Third group
(c) Fifth group
(d) Seventh group
