ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which of the following is correct?

• Reduction of any aldehyde gives secondary alcohol A
• Reaction of vegetable oil with H₂SO₄gives glycerine B
• Alcoholic iodine with NaOH gives iodoform C
• Sucrose on reaction with NaCl gives invert sugar D

Which is not the affect of polluted air on environment

• Acid rain A
• Smog B
• Ozone C
• Global warming D

The state of hybridization of carbon atom in methane is:

• sp³ A
• sp² B
• sp C
• dsp² D

The brown gas formed when metal reduces HNO₃is

• N₂O₅ A
• N₂O₃ B
• NO₂ C
• NO D

Which of the following reactions occur at moderate rate :

• Rusting of iron A
• Chemical weathering of stone work of buildings by acidic gases in atmosphere. B
• Hydrolysis of an ester C
• Fermentation of sugars D

Which of the following molecules have its central atom sp²hybridized

• CH₄ A
• C₂H₂ B
• C₂H₄ C
• CCl₄ D

The number of coulombs required for the deposition of 107.870 g of silver is

• 96500 A
• 48250 B
• 193000 C
• 10000 D

Arabic word "alkali" means:

• The ashes A
• the sour B
• The fragrant C
• Caustic D

The credit of discovering neutron goes to

• Rutherford A
• Langmuir B
• Chadwick C
• Austen D

Selection of filter paper depends upon sizes of particles to be :

• Tested. A
• Filtered. B
• Checked. C
• All of above. D

The colour of transition metal complexes is due to:

• d-d transitions of electorns A
• Paramagnetic nature of transition B
• Ionization C
• Loss of s-electrons D

Synthesis rubber is made by polymerization :

• Chloroform A
• Acetylene B
• Divinyl acetylene C
• Butene D

Rates of organic reactions are

• Fast A
• Very fast B
• Slow C
• Non-reactive D

Ethylene decolorizes cold dilute solution of KMnO₄. This test is known as

• Colouration test A
• Baeyer's test B
• Silver mirror test C
• Ring test D

• 
  A
• 
  B
• 
  C
• 
  D

Which one of the following is a water soluble vitamin

• Niacin A
• Riboflavin B
• Tyrosine C
• Ascorbic acid D

Number of sigma bonds in P₄O₁₀is

• 6 A
• 7 B
• 17 C
• 16 D

Which of the following is produced when an aqueous solution of butan-2-ol is refluxed with dil acidified KMnO₄

• Butanol A
• Butanoic acid B
• Butanone C
• Butane D

Which is not the poplar reaction

• 
  A
• 
  B
• 
  C
• 
  D

If initial concentration of the reactants and half life period of the reaction is known, then we can determine

• Average rate of reaction A
• Order of reaction B
• Rate constant k C
• Instantaneous rate D

The atomic mass is measured in atomic mass unit (a.m.u.) which is equal to

• 1.661 x 10^{-27- Kg} A
• 1.661 x 10^-24Kg B
• 1.661 x 10^{-27- g} C
• 1.661 x 10^-24mg D

The main structure features of proteins is

• An ester linkage A
• An ether linkage B
• The peptide linkage C
• All D

Which of the following reagents is used to distinguish between methanoic acid and ethanoic acid?

• Amm. silver nitrate solution A
• Neutral ferric chloride B
• Sodium hydroxide solution C
• Sodium carbonate solution D

The cell which generates electricity as a result of spontaneous oxidation-reduction reaction is called

• Electrolytic cell A
• Nelson's cell B
• Galvanic cell C
• Down's cell D

The measurement of degree of disorder is

• Internal energy A
• Enthalpy B
• Entropy C
• None D

Which gasses are produced from landfills

• NH₃ A
• H₂S B
• N₂ C
• All of these D

Group VI-A elements are called:

• Halogens A
• Electron deficient B
• alkaline earth metal C
• Chalcogens D

Which of the following compounds is explosive in nature?

• Phosphorus trichloride A
• Nitrogen trichloride B
• Hyponitrous acid C
• Nitrosyl chloride D

Ammonium nitrate fertilizer is not used for which crop?

• Cotton A
• Wheat B
• Sugar-cane C
• Paddy rice D

Grignard reagent is prepared by the reaction of magnesium metal with alkyl halide in the presence of

• Alcohol A
• Water B
• Suephuric acid C
• Dry ether D