ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Hydrolysis of trichloromethane with aqueous KOH gives

• Potassium formate A
• Acetylene B
• Chloral C
• Methanol D

• Electrophilic addition A
• Electrophilic substitution B
• Free radical substitution C
• Nuclophilic addition D

• 450°C A
• 250°C B
• 850°C C
• 1000°C D

The electron in an atom

• moves randomly around the nucleus A
• has fixed space around the nucleus B
• is stationary in various energy levels C
• moves around its nucleus in definite energy levels D

In a Galvanic cell, the electrons flow from

• A node to cathode through the solution A
• Cathode to anode through the external circuit B
• Cathode to anode through the external circuit C
• Anode to cathode through the external circuit D

In which molecule carbon atom is sp²hybridized

• CH₄ A
• C₂H₄ B
• C₂H₂ C
• None of the above D

Dilatometer method is useful for the reaction that involve :

• Small volume changes in solutions A
• Change in infractive indices B
• Where reactants absorb U.V, visible or infrared radiation C

The solution of which acid is used for seosoning of food ?

• Formic acid A
• Acetic acid B
• Benzoic acid C
• Butanoic acid D

The statement that the properties of every eight elements are similar to the first is the law of

• Dobereiner A
• Newland B
• Mendeleev C
• L. Meyer D

Which of the following is not a fatty acid

• Propanoic acid A
• Acetic acid B
• Phthalic acid C
• Butanoic acid D

• Rate = k[FeCl₃] [Kl]² A
• Rate = k[Fe⁺³][Cl^-1] [Kl] B
• Rate = k[Fe⁺³] [Cl^-1][K;] C
• Rate = k[Kl]³[FeCl₃]° D

Which one of the following is a colligative property?

• Surface tension A
• Osmotic pressure B
• Viscosity C
• Refractive index D

A free radical reaction takes place in three steps, initiation, propagation and terminations. Which of the following expression represents a propagation step

• 
  A
• 
  B
• 
  C
• 
  D

Which bond is most stable

• C - Cl A
• C - F B
• C - Br C
• C - I D

• A primary alcohol A
• A secondary alcohol B
• An eher C
• A phenol D

Which of the following is not a synthetic polymer?

• Polyethylene A
• PVC B
• Nylon C
• Cellophane D

Enzymes are catalysts which contain other than carbon and hydrogen one other element

• Oxygen A
• Sulphur B
• Phosphorus C
• Iodine D

Which of the following oxides is peroxide?

• Na₂O₂ A
• MnO₂ B
• BaO C
• SO₂ D

Most metals are conductors of electricity because of the :

• Light weight. A
• Immobility of the electrons. B
• Lustrous surfaces C
• Relatively free movement of their electrons D

• 1, 5-pentadiene A
• Penta-1, 4-diene B
• 1, 1-pentadiene C
• 1, 4-pentene D

Transition elements are called so because:

• Form interstital sompounds A
• have high m.p B
• In between 's' and' 'p' block elements C
• All of these D

Heat of neutralization of weak acid and a strong base is

• 13.7 Kcal A
• Less than 13.7 Kcal B
• Greater than 13.7 Kcal C
• None of these D

Sodium can be obtained by :

• Electrolysis of acidified water. A
• By heating NaCl and water at 100°
  B
• Electrolysis of molten sodium chloride. C
• Electrolysis of aqueous sodium chloride. D

The molarity of the solution containing x grams (NH₄)₂SO₄in 500 cm³of the solution is 0.6 what is x

• 39.6 A
• 45.1 B
• 40.5 C
• 42.7 D

1 erg of energy corresponds to

• 6.02 x 10²³J/mol A
• 6.02 x 10¹⁶J/mol B
• 1 erg/mol C
• 10^-7J/mol D

Mass spectrometer measures the

• Exact mass of an element A
• Average mass of an element B
• The number of elements present in a molecule C
• m/e value of a positive ion D

When n-hexane is heated in the presence of Pt at 500°C, it cyclists to give

• Benzene A
• Cyclohexene B
• Benzene C
• Toluene D

Which of the following compounds contains the highest percentage by mass of nitrogen?

• Ammonia, NH₃ A
• Ammonium carbamate, NH₂CO₂NH₄ B
• Ammonium carbonate, (NH₄)₂CO₃ C
• Hydrazine, N₂H₄ D

Which of the following is non-typical transition element?

• Cr A
• Mn B
• Zn C
• Fe D

The development of disagreeable odur in fats or oil is called

• Fragrance A
• Perfume B
• Rancidity C
• Smell D