ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which is plaster of paris?

• CaSO₄.H₂O A
• (CaSO₄)₂.H₂O B
• CaSO₄.2H₂O C
• CaSO₄.3H₂O D

If acetyl chloride is reducing in the presence of BaSO₄and Pd, then

• CH₃CHO is formed A
• CH₃CH₂OH is formed B
• CH₃COOH is formed C
• CH₃COCH₃is formed D

The number of unpaired electrons in the p-subshell of oxygen atom

• 1 A
• 2 B
• 3 C
• 4 D

Transition elements belong to

• I-A & II-A A
• III-A to VIII-A B
• I-B to X-B C
• Lanthanides D

Gaseous HF exists in the form of

• Monomers A
• Cyclic hexames B
• As single entity C
• Both (a) and (b) D

Between CH₃COOH and HCOOH, HCOOH will be

• Less acidic A
• Equally acidic B
• More acidic C
• None D

If heat absorbed in the reaction, the process is said to be

• Exothermic A
• Isothermal B
• Adiabatic C
• Endothermic D

Which of the following is the simplest form of matter?

• Gaseous state A
• Liquid State B
• Solid State C
• All of above D

The rigid rocket part of earth crust called lithosphere extends upto a depth of:

• 10 km A
• 100 km B
• 1000 km C
• 1500 km D

The alkyl halide is converted into an alcohol by

• Addition A
• Substitution B
• Dehydrohalogenation C
• Elimination D

The energy of the first electron is helium will be

• -13.6 eV A
• -54.4 eV B
• -5.44 eV C
• zero D

If an electrophile attacks then ______ bond breaks first

• C - H A
• O - H B
• C - O C
• None of these D

Which is true about the electronegativity order of the following?

• P > Si A
• C > N B
• Br > Cl C
• Sr > Ca D

When chloroform is boiled with NaOH, it gives

• Formic acid A
• Trihydroxymethane B
• Acetylene C
• Sodium formate D

• Zn A
• H B
• S C
• O D

Ammonia is injected under the soil surface:

• 1 Feet A
• 6 inches B
• 6 Feet C
• 9 inches D

After chlorination, the pulp is washed at:

• 20°C A
• 30°C B
• 40°C C
• 60°C D

• 2, 2, 4-trimethylpentane A
• 2, 4, 4-trimethylpentane B
• 2, 4, 4-methyepentane C
• 2, 2, 4-methylpentane D

Two moles of HI was heated in a sealed tube at 440°C till the equilibrium was reached. HI was found to be 22% decomposed. The equilibrium constant for dissociation is

• 0.282 A
• 0.0796 B
• 0.0199 C
• 1.99 D

In which type of following solutions we don't know the total volume of the solutions :

• Percentage weight/weight A
• Percentage weight/volume B
• Percentage volume/volume C
• Percentage volume/weight D

E.N. Value of fluorine is:

• 2.1 A
• 2.5 B
• 3.5 C
• 4.0 D

In gases and liquids, temperature is the measure of

• Average translational kinetic energies of molecules A
• Average vibrational kinetic energies of molecules B
• Average rotational kinetic energies of molecules C
• None of above D

A solution sucrose is 34.2%. The volume of solution containing one mole of solute :

• 342cm³
  A
• 1000cm³
  B
• 500cm³ C
• 242cm³ D

Peptide bond is a key feature in

• Polysaccharide A
• Proteins B
• Nucleotide C
• Vitamins D

Which statement is incorrect about standard hydrogen electrode

• Its oxidation and reduction potential is zero A
• It consists of Pt wire dipped on 1 molar HCI solution B
• The electrolyte is 1 molar NaOH solution C
• H₂gas is passes in it at 1 atmospheric pressure D

Macromolecules are

• organic molecules A
• High molecular mass molecules B
• Natural compounds C
• Rarely occurring molecules D

Hydrogen bond is the strongest between the molecules of

• HF A
• HCl B
• HBr C
• HI D

Cracking normally gives smaller ______

• Alkanes A
• Alkenes B
• Alkynes C
• Both a and b D

Wholer prepared urea from

• Ammonia A
• NH₄CNO B
• NH₃ C
• Uric acid D

Which of the following nitrogen fertilizer contains more nitrogen

• NaNO₃ A
• KNO₃ B
• NH₄NO₃ C
• Urea D