Chemistry [Engineering Entrance]

Class/Course - Engineering Entrance

Subject - Chemistry

Total Number of Question/s - 3121

• 1. Some Basic Concepts of Chemistry - Quiz
  
  1. The density of a solution prepared by dissolving 120g of urea (mol. Mass = 60 u ) in 1000g of water is 1.15 g/mL. The molarity of this solution is:
  a) 0.50 M
  b) 1.78 M
  c) 1.02 M
  d) 2.05 M
  

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  2. The mass of potassium dichromate crystals required to oxidise 750 cm² of 0.6 M Mohr's salt solution is (molar mass = 392)
  a) 0.49 g
  b) 0.45 g
  c) 22.05 g
  d) 2.2 g
  

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• 2. States of Matter - Quiz
  
  1. The molecular velocity of any gas is
  a) inversely proportional to the square root of temperature
  b) inversely proportional to absolute temperature
  c) directly proportional to square of temperature
  d) directly proportional to square root of temperature
  

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  2. The compressibility factor for a real gas at high pressure is
  a) 1 + $\frac{RT}{pb}$
  b) 1
  c) 1 + $\frac{pb}{RT}$
  d) 1 - $\frac{pb}{RT}$
  

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• 3. Atomic Structure - Quiz
  
  1. Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers , l=1 and 2 are, respectively
  a) 12 and 4
  b) 12 and 5
  c) 16 and 4
  d) 16 and 5
  

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  2. The energy required to break one mole of Cl-Cl bonds in Cl₂ is 242 kJ mol^-1 . The longest wavelength of light capable of breaking a single Cl-Cl bond is
  a) 594 nm
  b) 640 nm
  c) 700 nm
  d) 494 nm
  

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• 4. Chemical Bonding - Quiz
  
  1. The molecule having smallest bond angle is
  a) NCl₃
  b) AsCl₃
  c) SbCl₃
  d) PCl₃
  

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  2. The correct statement for the molecule CsI₃ is
  a) It is a covalent molecule
  b) It contains Cs⁺ and $I_{3}^{-}$
  c) It contains Cs³⁺ and I^- ions
  d) It contains Cs⁺, I^- and lattice I₂ molecule
  

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• 5. Thermodynamics - Quiz
  
  1. The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm³ to a volume of 100 dm³ at 27⁰ C is
  a) 38.3 J mol^-1 K^-1
  b) 35.8 K mol^-1 K^-1
  c) 32.3 J mol^-1 K^-1
  d) 42.3 J mol^-1 K^-1
  

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  2. In a fuel cell, methanol is used as fuel and oxygen gas is used as an oxidiser. The reaction is
  CH₃OH (l) + $\frac{3}{2}$O₂ (g) → CO₂ (g) + 2H₂O (l)
  At 298 K standard Gibbs energies of formation for CH₃OH (l), H₂O (l) and CO₂(g) are -166.2, -237.2 and -394.4 kJ mol^-1, respectively . If standard enthalpy of combustion of methanol is -726 kJ mol^-1, efficiency of the fuel cell will be
  a) 80%
  b) 87%
  c) 90%
  d) 97%
  

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• 6. Solutions - Quiz
  
  1. The molaltiy of a urea solution in which 0.0100 g of urea, [(NH₂)₂CO] is added to 0.3000 dm³ of water at STP is
  a) 0.555 m
  b) 5.55 x 10^-4 m
  c) 33.3 m
  d) 3.33 x 10^-2 m
  

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  2. Which one of the following aqueous solutions will exhibit highest boiling point?
  a) 0.01 M Na₂SO₄
  b) 0.01 M KNO₃
  c) 0.015 M urea
  d) 0.015 M glucose
  

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• 7. Equilibrium - Quiz
  
  1. Solubility of Ca(OH)₂ is S mol L^-1 . The solubility product (K_sp) under the same condition is
  a) 4S³
  b) 3S⁴
  c) 4 S²
  d) S³
  

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  2. Solid Ba(NO₃)₂ is gradually dissolved in a 1.0 x 10^-4 M Na₂CO₃ solution. At what concentration of Ba²⁺, will a precipitate begin to form?
  (K_sp for BaCO₃ = 5.1 x 10^-4)
  a) 4.1 x 10^-5 M
  b) 5.1 x 10^-5 M
  c) 8.1 x 10^-6 M
  d) 8.1 x 10^-7 M
  

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• 8. Redox Reactions and Electrochemistry - Quiz
  
  1. Given, $E_{Cr^{3+}/Cr}^{0}$ = -0.74 V;
  $E_{MnO_{4}^{-}/Mn^{2+}}^{0}$ = 1.51 V
  $E_{Cr_{2}O_{7}^{2-}/Cr^{3+}}$ = 1.33V
  E_cl/cl^- = 1.36V
  Based on the data given above, strongest oxidising agent will be
  a) Cl
  b) Cr³⁺
  c) Mn²⁺
  d) $MnO_{4}^{-}$
  

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  2. The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is
  a) 3
  b) 2
  c) 6
  d) 4
  

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• 9. Chemical Kinetics and Surface Chemistry - Quiz
  
  1. The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statements is not correct?
  a) Coagulation in both sols can be brought about by electrophoresis
  b) Mixing the sols has no effect
  c) Sodium sulphate causes cosgulation in both sols
  d) Magnesium chloride solution coagulation the gold sol more readily than the iron (III) hydroxide sol
  

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  2. The rate equation for the reaction 2A + B → C is found to be rate = k[A][B]. The correct statement in relation to this reaction is that the
  a) unit of k must be s^-1
  b) t_1/2 is a constant
  c) rate of formation of C is twice the rate of disappearance of A
  d) value of k is independent of the initial concentration of A and B
  

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• 10. Periodicity of Elements - Quiz
  
  1. The radius of La⁺ (atomic number : La = 57) is 1.06 Å . Which one of the following given values will be closest to the radius of Lu³⁺ ( atomic number : Lu = 71) ?
  a) 1.60Å
  b) 1.40Å
  c) 1.06 Å
  d) 0.85 Å
  

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  2. Which one of the following ions has the highest value of ionic radius?
  a) Li⁺
  b) B³⁺
  c) O^2-
  d) F^-
  

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• 11. Principles and Processes of Metallurgy - Quiz
  
  1. Which one of the following ores is best concentrated by froth-floatation method?
  a) magnetite
  b) Cassiterite
  c) Galena
  d) Malachite
  

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  2. Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?
  a) Metal sulphides are thermodyamically more stable than CS₂
  b) CO₂ is thermodynamically more stable than CS₂
  c) Metal sulphides are less stable than the corresponding oxides
  d) CO₂ is more volatile than CS₂
  

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• 12. Hydrogen, s and p-Block Elements - Quiz
  
  1. The products obtained on heating LiNO₃ will be
  a) LiNO₂ + O₂
  b) Li₂O + NO₂ + O₂
  c) Li₃N + O₂
  d) Li₂O + OH + O₂
  

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  2. Which one of the following reaction of xenon compounds is not feasible?
  a) XeO₃ + 6HF → XeF₆ + 3H₂O
  b) 3XeF₄ + 6H₂O → 2Xe + XeO₃ + 12HF + 1.5O₂
  c) 2HeF₂ + 2H₂O → 2Xe + 4HF + O₂
  d) XeF₆ + RbF → Rb[XeF₇]
  

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• 13. d- and f-Block Elements and Coordination Chemistry - Quiz
  
  1. Which one of the following complex ions has geometrical isomers?
  a) [Co(en)₃]³⁺
  b) [Ni(NH₃)₅Br]⁺
  c) [Co(NH₃)₂(en)₂]³⁺
  d) [Cr(NH₃)₄(en)]³⁺
  

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  2. A red solid is insoluble in water. However, it becomes soluble if some KI is added to water . Heating the red solid in a test tube results in liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube . The red solid is
  a) $(NH_{4})_{2}Cr_{2}O_{7}$
  b) $HgI_{2}$
  c) Hgo
  d) $Pb_{3}O_{4}$
  

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• 14. Environmental Chemistry - Quiz
  
  1. When rain is accompanied by a thunderstorm, the collected rain water will have a pH value
  a) slightly lower than that of rain water without thunderstorm
  b) slightly higher than that when the thunderstorm is not there
  c) unifluenced by occurrence of thunderstorm
  d) which depends on the amount of dust in air
  

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  2. The smog is essentially caused by the presence of
  a) O₂ and O₃
  b) O₂ and N₂
  c) oxides of sulphur and nitrogen
  d) O₃ and N₂
  

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• 15. General Organic Chemistry - Quiz
  
  1. Tertiary alkyl halides are practically inert to substitution by S_N2 mechanism because of
  a) steric hindrance
  b) inductive effect
  c) instability
  d) insolubility
  

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  2. The IUPAC name CH₃COCH(CH₃)₂ is
  a) isopropylmethyl ketone
  b) 2-methyl-3-butanone
  c) 4-methylisopropyl ketone
  d) 3-methyl-2-butanone
  

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• 16. Hydrocarbons and their Halogen Derivatives - Quiz
  
  1. On mixing ethyl acetate with aqueous sodium chloride, the composition of the resultant solution is
  a) $CH_{3}COOC_{2}H_{5} + NaCl$
  b) $CH_{3}COONa + C_{2}H_{5}OH$
  c) $CH_{3}COCl + C_{2}H_{5}OH + NaOH$
  d) $CH_{3}Cl + C_{2}H_{5}COONa$
  

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  2. Butene-I may be converted to butane by reaction with
  a) Zn-HCl
  b) Sn-HCl
  c) Zn-Hg
  d) Pd/H₂
  

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• 17. Organic Compounds Containing Oxygen - Quiz
  
  1. In the reaction
  $CH_{3}COOH \overset{LiAlH_{4}}{\rightarrow} A \overset{PCl_{5}}{\rightarrow} B \overset{alc. KOH}{\rightarrow} C$
  the product C is
  a) acetaldehyde
  b) acetylene
  c) ethylene
  d) acetylchloride
  

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  2. Phenyl magnesium bromide reacts with methanol to give
  a) a mixture of anisol and Mg(OH)Br
  b) a mixture of benzene and Mg(OMe)Br
  c) a mixture of toulene and Mg(OH)Be
  d) a mixture of phenol and Mg(Me)Br
  

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• 18. Organic Compounds Containing Nitrogen - Quiz
  
  1. Toulene is nitrated and the resulting product is reduced with tin and hydrochloric acid . The product so obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed contains.
  a) mixture of o- and p-bromotoulenes
  b) mixture of o- and p-dibromobenzenes
  c) mixture of o- and p-dibromoanilines
  d) mixture of o- and p-bromotoluenes
  

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  2. Which one of the following methods is neither meant of the synthesis nor for seperation of amines?
  a) Curtius reaction
  b) Wurtz reaction
  c) Hofmann method
  d) Hinsberg method
  

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• 19. Polymers and Biomolecules - Quiz
  
  1. Nylon threads are made up of
  a) polyvinyl polymer
  b) polyester polymer
  c) polyamide polymer
  d) polyethylene polymer
  

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  2. The polymer containing strong intermolecular forces e.g, hydrogen bonding, is
  a) teflon
  b) nylon 6 6
  c) polystyrene
  d) Natural number
  

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• 20. Analytical Chemistry and Chemistry in Everyday Life - Quiz
  
  1. How many EDTA (ethylenediamine tetraacetic acid ) molecules are required to make an octahedral complex with a Ca²⁺ ion?
  a) Six
  b) Three
  c) One
  d) Three
  

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  2. Coordination compounds have great importance in biological systems. In this context , which of the following statements is incorrect?
  a) Chlorophyll is green pigment in plant and contain calcium
  b) Haemoglobin is the red pigment of blood and contains iron
  c) Cyanocobalamin is vitamin B₁₂ and contains cobalt
  d) Carboxypeptidase-A is an enzyme and contains zinc
  

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