ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Rare earth elements are

• s-block elements A
• p-block elements B
• d-block elements C
• f-block elements D

Rate of chemical reaction depends upon :

• The number of total collisions per second. A
• Number of molecules taking part in a chemical reaction. B
• Number of fruitful collisions per second C
• Number of fruitless collisions per second. D

Which has sweetish taste?

• N₂O A
• NH₃ B
• Cl₂ C
• CO₂ D

When electrons revolve in stationary orbits

• There is no change in energy level A
• They vecome stationary B
• They are gaining kinetic energy C
• There is increase in energy D

An oil or fat with no double bond have iodine number:

• Zero A
• 100% B
• 50% C
• minimum D

Which element has highest oxidation potential

• Li A
• Be B
• Ba C
• Ra D

Which one of the following solution will have higher vapour pressure than that of water

• Aqueous solution of methanol A
• Aqueous solution of HCI B
• Aqueous solution of glucose C
• Aqueous solution of urea D

At constant temperature when pressure of a gas is plotted against volume, the curve is

• Slanting straight line A
• Parabolic B
• Staight line, parallel to pressure axis C
• OF neither type D

Carboxylic acids functional group is:

• ----COOH A
• ----CO--- B
• ----OH C
• -----COH D

Which of the following equation represents reaction when lithium nitrate is heated.

• 2LiNo4------- Li2O + NO2 A
• 4Li NO3 ------- 4LiO2 + 4NO2 +O2 B
• LiNO3---------Li2O + 4NO2 C
• 2LiNO4------- Li2O + NO2+O2 D

Distillation of calcium salts of acetic acid and formic acids gives acetaldehyde. What compound would be obtained if only calcium salt of acetic acid is distilled

• Formaldehyde A
• Butyraldehyde B
• Propionaldehyde C
• Acetone D

Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding?

• Orbital overlap will not occur A
• Bonding will not occur B
• Both (A) and (B) are correct C
• None of the above are correct D

Ammonia contains nitrogen in it

• 46% A
• 50% B
• 80% C
• 82% D

Which gas is heavier than air?

• CO₂ A
• NH₃ B
• Cl₂ C
• CO₂ D

• Zero A
• 253 sec B
• 150 sec C
• 500 sec D

Shielding effect intervening electrons causes

• Decreases in atomic radii in a period from right to left A
• Increase in atomic radii in a period from left to righ t B
• Decrease in atomic radii down the group C
• Increase in atomic radii down the group D

The electrolysis of CuSO₄aqueous solution using copper as cathode as well an anode the substance which deposits at cathode is

• H₂SO₄ A
• Oxygen B
• Copper C
• Hydrogen D

Coligative properties are the properties of

• Dilute solution which behave as nearly ideal solutions A
• Concentrated solutions which behave as nearly non-ideal solution B
• Both (i) and (ii) C
• Neither (i) and (ii) D

• Non polar R group A
• Polar R group B
• Acidic R group C
• Metallic R group D

Simple sugars are :

• Monosaccharides A
• Disaccharides B
• Oligo saccharides C
• Trisaccharides D

The number of atoms or molecules whose concentrations determine the rate of the reaction is called

• Molecularity A
• Order B
• Rate of reaction C
• Rate constant D

Which of the following is a nucleophile

• OH A
• CH(CH₃)₃ B
• CH₃⁺ C
• CH₃CH₂CH₃ D

Compounds having same molecular formula but different structures are said to be

• Monomers A
• Isomers B
• Metamers C
• Tautomers D

Which the increase in carbon number of solubility of an alcohol

• Increases A
• Decreases B
• Remains unaffected C
• None of these D

The largest item which is recycled is

• Newspaper A
• Plastic B
• Aluminium C
• Oil D

Hydroxyl amine is a derivative of::

• Alcohol A
• Aldehyde B
• Ammonia C
• Ketone D

Which has highest 1st I.E.

• Br A
• Cl B
• F C
• l D

In Solids, the temperature is the measure of

• Rotational kinetic energies A
• Translational kinetic energies B
• Vibrational kinetic energies C
• None of above D

Addition of solid NaHCO₃in water causes ionization of NaCHO₃its K_a= 4.7 x 10^-1. Then this solution has character

• Acidic A
• Very weakly basic B
• Alkaline C
• Neutral D

An electron with n = 3 , l = 2 will be in the sub-shell

• 3p A
• 3d B
• 3f C
• 3s D