ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The pH of 10^-3mole dm^-3of an aqueous solution of H₂SO₄is

• 3.0 A
• 2.7 B
• 2.0 C
• 1.5 D

Which one of the following is the weakest intermolecular force

• Dipole induced dipole forces A
• Ionic dipole forces B
• Electrostatics forces between ions C
• Dipole-dipole forces D

Dehydration of glycerol give

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

• Le-chatlier's principle A
• Only adding catalyst B
• Decreasing pressure C
• Decreasing temperature D

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

The functional group isomer of dimethylether is

• Ethyl alcohol A
• Propyl alcohol B
• Diethyl ether C
• Butyl alcohol D

From the following values of dissociation constants of four acids which value represents the strongest acid?

• 2 x 10^-2 A
• 0.02 x 10^-1 B
• 3 x 10^-4 C
• 2 x 10^-4 D

Which of the following is an electrophile

• Bromine A
• KBr B
• NH₃ C
• Benzene D

Which of the following is used as disinfectant

• K₂Cr₂O₇ A
• KMnO₄ B
• K₂MnO₄ C
• K₂CrO₄ D

Which has garlic like odour?

• N₂O A
• NO B
• NO₂ C
• NH₄ D

Escape of high energy molecules from the surface of a liquid is called

• Sublimation A
• Distillation B
• Condensation C
• Evaporation D

Methyl alcohol is not used:

• As a subsitution for petrol A
• As an anti-freezing agent B
• For denating of ethyle alcohal C
• As a solvent D

Poly hydroxyl compounds of aldehyde ketones are:

• Carbohydrates A
• Protiens B
• Fats C
• Lipids D

The charge of an electron is determined by

• J.J. Thomson A
• Crooks B
• Perrin C
• R.A.Millikan D

Born-Haber cycle is an application of

• First of thermodynamics A
• Second law of thermodynamics B
• First law of thermodynamics C
• Hess's law D

Corrundam is ore of:

• Li A
• Be B
• B C
• Al D

The organic compound, alcohols are much closer to, in structure and hence is also called its derivative:

• Water A
• Oxidizes of lithium oxides B
• Oxidizes of magnesium C
• Oxidizes of aluminium 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

Reaction of HNO, with very dilute Zinc and at low temperature gives

• H₂ A
• NO B
• NO₂ C
• NH₄ D

Polycyolic aromatic hydrocarbons are taught to be

• Disinfectant A
• Carcinogenic B
• Helpful C
• Reactive D

The isotopes of an element

• Possess same mass number A
• Possess same number of protons B
• Do not possess same chemical properties C
• May or may not possess same chemical properties D

Alkyl halides ae considered to be very reactive compounds towards nucleophiles because

• They have an electrophilic carbon A
• They have an electrophilic carbon and a good leaving group B
• They have an electrophilic carbon and a bad leaving group C
• They have a nucleophilic carbon and a good leaving group D

Which is not the enzyme involved in the preparation of ethyl alcohol by fermentation of starch

• Diastase A
• Maltase B
• Zymase C
• Invertase D

Corrosion of iron can be prevented by coating the surface with

• Zn A
• Sn B
• Ni C
• Any of the above D

When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as

• Balmer series A
• Lyman series B
• Pfund series C
• Brackett series D

pH of 1 molar NaOH is

• 7 A
• zero B
• 14 C
• 10 D

Which of the following species has the maximum number of unpaired electrons?

• O₂ A
• O₂⁺ B
• O₂^- C
• O₂^-2 D

The rate of reaction :

• Increase as the reaction proceeds. A
• Decreases as the reaction proceeds. B
• Remains the same as the reaction proceed. C
• May decrease or increase as the reaction proceeds. D

Chlorobenzene on heating with aqueous NH₃under pressure in the presence of cuprous chloride gives

• Benzamide A
• Nitrobenzene B
• Aniline C
• Chloroaminobenzene D

The unit rate of constan K ismole^-1 dm³S^-1for a chemical reaction, the order of reaction is :

• 3 A
• 2 B
• 1 C
• 0 D