ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The correct order of electron affinity among the following is

• F > Cl > Br A
• Br > Cl > F B
• Cl > F > Br C
• F > Br > Cl D

Which one of these is weakest?

• Ionest bond A
• Covalent bond B
• Metallic bond C
• Van der Waal's forces D

Polythene is a polymer of

• Ethane A
• Ethene B
• Acetone C
• Propylene D

The mass of the neutron is of the order of

• 10^-23 kg A
• 10^-24kg B
• 10^-26kg C
• 10^-27kg D

Which of the following derivative cannot be prepared directly from acetic acid?

• Acetamide A
• Acetyl chloride B
• Ethyl acetate C
• Acetic acid D

A pollutant affects

• Human health A
• Quality of life B
• Functioning of ecosystem C
• All of these D

Minamata disease is due to pollution of

• Organic waste into drinking water A
• Oil spill in water B
• Industrial waste containing mercury into fishing water C
• Arsenic into the atmosphere D

The number of moles of solute dissolved per dm³ of the solution is called :

• Normality. A
• Molarity. B
• Molarity. C
• None of above. D

Tollen's reagent is

• Ammonical cuprous chloride A
• Ammonical cuprous oxide B
• Ammonical silver bromide C
• Ammonical silver nitrate D

Halogens on treating with silver salts of acids give

• Alcohol A
• Ester B
• Phenol C
• Alkyl halide D

Which of the following is a typical transition metal?

• Sc A
• Y B
• Ra C
• Co D

E₁mechanism is generally shown by

• 1° - RX A
• 2° - RX B
• 3° - RX C
• None of these D

• High temperature and low pressure A
• Low temperature and high pressure B
• Low temperature and low pressure C
• High temperature and high pressure D

Formula of acetone is:

• HCHO A
• CH₃CHO B
• CH₃OCH₃ C
• CH₃OC₂H₅ D

Chemical reactivity of elements depends upon their characteristic:

• Shape. A
• Color. B
• Electronic configuration. C
• Sizes D

The human body can synthesize ______ amino acids

• 1 A
• 10 B
• 20 C
• 19 D

Transition metals mostly are

• Diamagnetic A
• Paramagnetic B
• Neither diamagnetic nor paramagnetic C
• Both diamagnetic and paramagnetic D

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

• 3p A
• 3d B
• 3f C
• 3s D

Propyne on hydrolysis in presence of H₂SO₄and HgSO₄gives

• Acetaldehyde A
• Acetone B
• Formaldehyde C
• None D

Chemical composition of colemnite is:

• Ca₂B₆O₁₁.5H₂O A
• CaB₄O₇ .4 H₂O B
• Na₂B₇O₇. 4 H₂O C
• CaNaB₅O₉.8H₂O D

Silver mirror test is applied for

• Aldehydes A
• Alcohols B
• Acids C
• Esters D

The percentage by weight of NaCl, if 6.0 g of NaCl is dissolved in 120 g of water is

• 10.5 % A
• 5% B
• 8.02% C
• 11.5% D

Ionization potential increases in moving from left to right in a period

• Because nuclear charge increase A
• Because atomic size decrease B
• Both (a) and (b) C
• Because atomic size increases D

Types of cracking are:

• Thermal A
• Catalytic B
• Steam C
• All a, b ,c D

Which is not the form of silica?

• Amethyst quatz A
• Rose quatz B
• Smoky C
• None of these D

Surfactants are organic compounds, used in detergents which reduce the

• Viscosity of water A
• Surface tension of water B
• Boiling point of water C
• Wetting ability of water D

Which one of the following is an ideal solution that obeys Rault's law

• Ethanol + water A
• Benzene + toluene B
• HCI + water C
• Acetone + chloroform D

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

• H₂ A
• NO B
• NO₂ C
• NH₄ D

Ethanol is prepared in Pakistan form fermentation of:

• Starch A
• Sugar B
• Glucose C
• Molasses D

How many mole of acidfied FeSO₄solution can be completely oxidized by one mole of KMNO₄?

• 10 A
• 5 B
• 6 C
• 2 D