ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which of the following is an electrophile

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

Chlorin heptoxide reacts with water to form:

• Hypochlorous acid A
• Chloric acid B
• Perchloric acid C
• Chlorine and oxygen D

• Primary alkyl halide A
• Secondary alkyl halide B
• Tertiary alkyl halide C
• None of these D

Gases exert pressure on walls of container because the gas molecules

• Obey gas laws A
• Have definite volume B
• Collide with the walls of container C
• Collide with each other D

When an alcohol reacts with SOCI₂an alkyl halide is formed. What are two other products

• SO₂and HCI A
• SI₂and H₂O B
• HCI and H₂O C
• H₂S and HCI D

Molecules of High molecular weight usually greater than 10,000 are called:

• Macro molecules A
• Mega molecules B
• Poly molecules C
• Gega molecules D

Protein are classified into

• Simple protein A
• Complex protein B
• Derived proteins C
• All of these D

A cell in which electric current is produced as a result spontaneous redox reaction is called :

• Dry cell A
• Electrolytic cell B
• Galvanic cell C
• Standard cell D

Rutherford's planetary like picture of the atomic modal was defective because

• It did not describe the quantity of positive charge A
• It did not explain the repulsion of protons within the nucleus B
• No empty space between nucleus and the electrons C
• Moving electron should radiate energy D

Pure water does not conduct electricity because it

• Has low boiling point A
• Is almost unionized B
• Is neutral C
• Is readily decomposed D

The compound which gives oxygen on moderate heating is

• Zinc oxide A
• Mercuric oxide B
• Aluminium oxide C
• Ferric oxide D

Corrosion reaction are

• Spontaneous redox reaction A
• Non-spontaneous acid-base reactions B
• Spontaneous acid-base reactions C
• None of these D

Coagulent used in water treatment

• Gypsum A
• Dolomite B
• Asbestos C
• Alum D

Acetaldehyde is used to make

• Rubbber A
• Antiseptics B
• Phenolic resin C
• All of these D

The periodic function of properties of elements is their atomic number

• Al-Razi A
• Mosley B
• Newland C
• Mendeleev D

The rate of reaction determined at a given time is called

• Average rate A
• Instantaneous rate B
• Specific rate C
• Overall rate D

Formula of chloroform is:

• CH₃Cl A
• CCl₄ B
• CH₂Cl₂ C
• CHCl₃ D

HF has exceptionally low acidic strengths due to

• Smaller size of fluorine A
• Strong polar bond between H and F B
• Electronegativity of fluorine C
• Strong hydrogen bonding D

Glyptal polymer is obtained from glycerol on reacting with

• Malonic acid A
• Phthalic acid B
• Maleic acid C
• Acetic acid D

What will be the molarity of solution if 103 g (NH₄)₂SO₄is dissolved per 600 cm³of water

• 2.32 M A
• 3.32 M B
• 4.32 M C
• 1.30 M D

Cane sugar is not soluble in benzene but soluble in water because

• Cane sugar is a macro molecule A
• Cane sugar is an ionic compound B
• Can sugar has hydrogen bonding C
• Can sugar is an organic molecule D

The rate of reaction is denoted by

• dc/dp A
• dc/ac B
• dc/dT C
• dc/dt D

Osmotic pressure of a solution increases by

• Decreasing the temperature A
• Increasing the volume B
• Increasing the number of molecules of the solute C
• None of the above D

Polypeptide chains are coiled about one another into a spiral by:

• Ionic bonds A
• Covalent bonds B
• Van der Waal's forces C
• Hydrogen bonds D

DDT is formed from

• Benzene and Chlorobenzene A
• Chloral and Chlorobenzene B
• Chloral and Benzene C
• Chlorobenzene and chlorine D

The pressure of vapours when sent to the ionization chamber in mass spectrometer is

• 10^-5to 10^-6torr A
• 10^-6to 10^-7torr B
• 10^-7to 10^-8torr C
• 10^-3to 10^-4torr D

Solvent extraction is an equilibrium process and it is controlled by :

• law of mass action. A
• the amount of solvent used. B
• distribution law. C
• the amount of solute. D

The 95.5% mass of Lithosphone is made of 11 elements i.e. O₂, Si, Al, Fe, Ca, Na, K, Mg, Ti, H₂and P. which element is present in trace amount

• Iodine A
• Bromine B
• Lead C
• Carbon D

The main source of natural fibre is

• Animal fibres A
• Vegetables fibres B
• Mineral fibres C
• All of the above D

Which of the following is not an ortho-para directing group

• 
  A
• 
  B
• 
  C
• 
  D