ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Vegetable oils are

• Unsaturated fatty acids A
• Glycerides of unsaturated fatty acids B
• Glyccerides of saturated fatty acids C
• Essential oils obtained from plants D

N₂ + 3H₂ ⇌2NH₃

The unit of K_c for tis reaction will be:

• mol² dm^-6

  A

• mol^-2 dm⁺⁶

  B

• mol dm^-3

  C

• mol^-1 dm⁺³

  D

Dehydration of glycerol give

• Propane A
• Propene B
• Acrolein C
• Benzene D

The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water in

• -1.86°C A
• -3.72°C B
• +1.86°C C
• +3.72°C D

A buffer solution of 0.1 molar HCOOH and 0.1 molar HCCONa has pH = 3.78 To is 0.01 molar HCl is added, then pH of the buffer solution becomes

• 2.78 A
• 4.78 B
• 3.78 C
• 3.70 D

The product of pressure and volume remains constant when temperature and quantity of gas is

• zero A
• variable B
• kept constant C
• None of these D

Potassium chromate has formula

• KClO₃ A
• K₂CO₃ B
• K₂CrO₄ C
• K₂Cr₂O₇ D

Which of the following is not a fatty acid

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

Which of the following salt is used as purgative

• CaSO₄ A
• MgSO₄ B
• BeSO₄ C
• NaCl D

During the process of crystallization, the hot saturated solution:

• is cooled very slowly to get large size crystals A
• is cooled at a moderate rate to get medium sized crystals of the product B
• is evaporated to get the crystals of the products C
• is mixed with an immiscible liquid to get the pure crystals of the product. D

During the manufacturing process of cement the temperature of the decomposition zone goes up to

• 600^oC A
• 8000^oC B
• 1000^oC C
• 1200^oC D

Carboxylic acids having carboxyl group one is called:

• Mono carboxylic acid A
• Di-carboboxylic acid B
• Tri carboxilic acid C
• Tetra carboxylic acid D

Methanol and ethanol can be distinguished by

• Iodoform test A
• Iucas test B
• Dichromate/H₂SO₄oxidation test C
• Flame test D

Allyl chloride on dehydrochlorination gives

• Propadiene A
• Propylene B
• Allyl alcohol C
• Acetone D

At present cement plants in Pakistan are:

• Ten A
• Twenty Two B
• Four C
• Twenty Four D

Which of the following fertilizers is useful for paddy rice

• Ammonium nitrate A
• Ammonium sulphate B
• Urea C
• Ammonium chloride D

Terylene is madeby polymerization of terephthalic acid with

• Ethylene glycol A
• Phenol B
• Ethanol C
• Catechol D

The movement of molecules from a region of high pressure to vacuum is called :

• Evaporation A
• Effusion B
• Conduction C
• Difusion D

The major components of coal gas are

• Hydrogen and methane A
• Ethane and carbon monoxide B
• Nitrogen and ethane C
• Ethane and carbon dioxide D

Zwitter ion is ______ ion an amino acid

• Polar A
• Monopular B
• Dipolar C
• Non polar D

For which of the following sets of quantum numbers and electron will have the highest energy?

• 3,2,1,1/2 A
• 4,2,-1,1/2 B
• 4,1,0,-1/2 C
• 5,0,0,1/2 D

The functional group of acid amide is

• 
  A
• 
  B
• 
  C
• 
  D

Which period starts from ₁₁Sc to ₃₀Zn ?

• First Period A
• Second Period B
• Third Period C
• 4th Period D

In the manufacture of iron from haematitie,limestone is added to act as

• Flux A
• A reducing agent B
• Slag C
• An oxidizing agent D

Ethylene combines with water in the presence of H₂SO₄+ HgSO₄and forms

• Ethyle chloride A
• Ethyle alcohol B
• Carboxylic acid C
• None of these D

• Reaction occurs at STP A
• Reaction is exothermic B
• Reaction is endothermic C
• Number of moles of production and reactant are same D

The decrease in radius in large for:

• Monovalent ions. A
• Trivalent ions. B
• Divalent ions. C
• Atoms. D

Which of the following does give violet colour with neutral ferric chloride?

• Acetic acid A
• Salicaylic acid B
• Formine acid C
• Benzoic acid D

Which bond shows maximum hydrogen bonding with water?

• CH₃OH A
• C₂H₅OH B
• CH₃----O----CH₃ C
• C₆H₅OH D

Which of the following statement is correct.

• Formaldehyde is used in silvering of mirror A
• Propanol and propanone behave similarly in Tollen's seagent B
• Acetone on reduction gives primary alcohols C
• Ketones gives brick red color with Fehling's solution D