ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which is not a calcarious material

• lime A
• clay B
• marble C
• marine shell D

A compound X has all of the following properties: It is a liquid at room temperature and atmospheric pressure; It does not mix completely with water; It does not decolorise acidified potassium manganate

What could X be

• Ethane A
• Ethanoic acid B
• Ethanol C
• Ethyl ethanoate D

One of the following statements is incorrect

• Actual yeild is always less than the theoretical yield A
• The formula of a compound is not definite B
• Law of conservation of mass is applied in stoictiometry C
• Boyles law is applied in stoichiometry D

Among the following, poly cyclic compound is:

• styrene A
• cumene B
• napthalene C
• xylene D

In a heterollytic bond fission reaction

• A molecule of H₂O is formed A
• A molecule of H₂O is eliminated B
• A free radical is formed C
• A positive and a negative ion is formed D

Which one of the following is not air pollutant gas

• CO A
• CO₂ B
• NO C
• SO₂ D

The temp. and pressure used for PVC polymerization is

• 10°C and 10 atm A
• 20°C and 20 atm B
• 52°C and 9 atm C
• 100°C and 10 atm D

What is formed when propanone is refluxed with an anhydrous solution of NaBH₄

• Propanal A
• Propan-1-ol B
• Propan-2-ol C
• Propane D

Ozonolysis of benzene gives

• nitration A
• sulphonation B
• ozonide C
• glyoxal D

Borax is hydrated:

• Penta A
• Deca B
• Hepta C
• Octa D

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

• 4 A
• 3 B
• 2 C
• 5 D

Enzymes catalyse all biological reactions occurring in the cell. What is true about an enzyme

• Enzyme is a small molecule A
• Enzyme is acidic in nature B
• Enzyme is a protein C
• Enzyme is a lipid D

The hydrocarbon which is used as an illuminating agent

• Methane A
• Methene B
• Methyne C
• B & C D

Bronze is an alloy which contains

• 60% cu A
• 70% cu B
• 80% cu C
• 99% cu D

• Adding 2(ii) + 3(iii) and subtracting i A
• Add i + ii + iii B
• Add i - ii + iii C
• Add i - ii - iii D

______ gives peroxide

• Li A
• Ba B
• Sr C
• Be D

Which if the following has the highest freezing point at one atmosphere

• 0.1 M NaCI A
• 0.1 M sugar solution B
• 0.1 M BaCI₂ C
• 0.1 M FeCI₂solution D

Which of the following molecules has zero dipole moment?

• NH₃ A
• CHCl₃ B
• H₂O C
• BF₃ D

Aldehydes can be distinguished from ketones by

• 2,4-DNPH test A
• NaHSO₃test B
• N₂H₄test C
• Tollen's test D

C₂H₅OH can be differentiated from CH₃OH by

• Reaction with HCl A
• Reaction with NH₃ B
• Iodoform test C
• Solubility in water D

Boiling point of acetic acid is ^oC

• 116 A
• 117 B
• 118 C
• 119 D

Sulphuric acid reacts with PCl₅to give

• Thionyl chloride A
• Sulphur monochloride B
• Sulphuryl chloride C
• Sulphur tetrachloride D

Factors affecting denaturation of proteins:

• Change in temp and pH A
• Strong reducing agent B
• Strong oxidizing agent C
• All of these D

Which one of the following statements is true about discovery of neutrons?

• These particles were formed by the bombardment of Alpha-particles on Beryllium. A
• These particles are formed by the spiting of alpha-particles. B
• These particles were discovered by natural radioactivity. C
• None of above. D

• Small change in concentration of product A
• Small time internal B
• Co-efficient of the reactant C
• Co-efficient of the product D

Metal used in the preparation of Grignard's reagent is:

• Ca A
• Na B
• Mg C
• Zn D

Reaction between Zn and CuSO₄can be called a system under

• Surrounding A
• Observation B
• system C
• None of above D

Which gasoline is better?

• Of low boiling point A
• Of low molecular mass B
• Of high octane C
• All of these D

Prevention of corrosion of iron by Zn coating is called

• Galvanization A
• Cathodic protection B
• Electrolysis C
• Photoelectrolysis D

Heat of neutralization of weak acid and a strong base is

• 13.7 Kcal A
• Less than 13.7 Kcal B
• Greater than 13.7 Kcal C
• None of these D