ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The cement plants in west Pakistan at the time of creation were

• ten A
• twenty two B
• four C
• twenty four D

London dispersion forces are also called:

• Hydrogen bonding. A
• Debye forces B
• Van der Waal's forces C
• Instantaneous dipole-induced dipole forces. D

Enzymes are catalysts which contain other than carbon and hydrogen one other element

• Oxygen A
• Sulphur B
• Phosphorus C
• Iodine D

Ionic Solids are characterized by

• Low melting points A
• Good conductivity in solid state B
• High vapour pressure C
• Solubility in polar solvents D

The boiling point of NH_{3 is maximum among the hydrides of group V elementsdue to:}

• Enhanced electronegative character of Nitrogen A
• Pyramidal structure of NH3 B
• Very small size of Nitrogen. C
• Enhanced electropositive character of Nitrogen D

The reference electrode is made by using

• ZnCl₂ A
• CuSO₄ B
• HgCl₂ C
• Hg₂Cl₂ D

After chlorination, the pulp is washed at

• 20°C A
• 30°C B
• 40°C C
• 60°C D

In fructose the possible optical isomers are

• 12 A
• 8 B
• 16 C
• 4 D

Which woody raw material is used for the manufacture of paper pupl

• Cotton A
• Bagasse B
• Poplar C
• Rice straw D

acetylene can be converted into-while passing through a Cu-tube at 300°C:

• Glyoxal A
• Vinyl acetylene B
• Vinyl alcohol C
• Benzene D

The most acidic of the following compounds is

• P₂O₃ A
• Sb₂O₃ B
• B₂O₃ C
• As₂O₃ D

Solvent extraction is an unstable,Process and it is controlled by:

• Alcohol extraction A
• Petrol extraction B
• Phenol extraction C
• Ether extraction D

Which the increase in carbon number of solubility of an alcohol

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

Ethanol can be converted into ethanoic acid :

• Hydrogenation A
• Hydration B
• Oxidation C
• Fermentation D

During electrolysis, the reaction that takes place at cathode is :

• Reduction A
• Both (a) and (c) B
• Oxidation C
• No reaction occurs D

Which element does not belong to 3d transition series

• Ti A
• V B
• Mn C
• Te D

Which of the following molecules has zero dipole moment?

• NH₃ A
• CHCl₃ B
• H₂O C
• BF₃ D

Neutrons was discovered by

• Mosely A
• Milliken B
• Chadwick C
• Ruherford D

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

Electron affinity depends on

• Atomic size A
• Nuclear charge B
• Atomic number C
• Atomic size and nuclear charge both D

The mass of Al₂S₃formed when 20 grams Al reacts completely with S is

• 60 g A
• 50 g B
• 50.55 g C
• 55.55 g D

How many are the zones through which the charge passes in a rotary kiln?

• 4 A
• 3 B
• 2 C
• 5 D

The benzene molecule contains

• Three double bond A
• Two double bond B
• One double bond C
• Delocalized pie electron charge D

Which one of the following gases is used for artificial ripening of fruits

• Ethane A
• Ethyne B
• Methane C
• Propane D

The specific conductance of a 0.1 N KCl solution at 23°C is 0.012 ohm^-1cm^-1. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be

• 0.142 cm^-1 A
• 0.66 cm^-1 B
• 0.916 cm^-1 C
• 1.12 cm^-1 D

Which of the following will have the highest boiling point?

• Methanal A
• Ethanal B
• Propanal C
• 2-Hexanone D

I-Chloropropane has two isomers, it is an example of

• Chain isomerism A
• Position isomerism B
• Functional group isomerism C
• Metamerism D

Which three elements are needed for the healthy growth of plants?

• N,S,P A
• N,Ca, P B
• N,P,K C
• N,K,C D

Molar mass of high molecular w.f. polymers ranges form:

• 1000 to 10000 A
• 10000 to 100000 B
• 100000 to 1000000 C
• 1000000 to 10000000 D

Which nitrogen fertilizer is favoured in tropical regions because of its-hygroscopic nature

• Ammonium sulphate A
• Ammonium nitrate B
• Ammonium chloride C
• Ammonium phosphate D