ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Odour of alkene is:

• Fruity A
• Odourless B
• Zarlic like C
• Irritating D

During the formation of a chemical bond the potential energy of the system

• Decreases A
• Increases B
• Does not change C
• None of these D

How many molecules of chlorine adds in benzene in the presence of sunlight

• One A
• Two B
• Three C
• Four D

All reactions occur in :

• A single step. A
• A series of steps B
• Two steps. C
• Both (a) and (b) D

• The value of K_pfalls with rise in temperature A
• The value of K_pfalls with increasing pressure B
• Addition of V₂O₅catalyst increase the concentration of SO₃ C
• The value of K_pis equal to K_c D

The compounds which have any atom other than Carbon atom, in rings are called as

• Monocyclic A
• Heterocyclic B
• Homocyclic C
• None of the above D

The formula of ketone is

• 
  A
• 
  B
• 
  C
• None of these D

Oxidation state of fluorine is:

• +1 A
• +2 B
• -1 C
• -2 D

For every reaction occurring in the body three is at least one type of

• Enzyme A
• Vitamin B
• Protein C
• Amino acid D

Sodium is manufacture by the electrolysis of fused sodium chloride and not from an aqueous solution of sodium chloride because

• Sodium chloride does not ionize in the water solution A
• Sodium chloride is not soluble in water B
• Sodium deposited at the cathode may react with water to form sodium hydroxide C
• Electricity does not pass through aqueous NaCl D

Among the following elements which one has the highest value of first ionization potential?

• Oxygen A
• Argon B
• Barium C
• Cesium D

The periodic table gives basic framework to study the periodic.

• Elements only A
• Compounds only B
• Elements and their compounds C
• Elements and their inorganic D

Alkali metals react violently with halogens to form

• Hydrides A
• Halides B
• Anyhydrides C
• None of these D

How many secondary alcoholic groups are present in the structure of glucose OHC CHOH CHOHCH OH CHOH CH₂OH

• 1 A
• 2 B
• 3 C
• 4 D

______ are called biocatalysts

• Organic acids A
• Organic bases B
• Enzymes C
• All D

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

• Zero A
• 100% B
• 50% C
• Minimum D

Solubility of a substance in water decreases with rise in temperature except

• CaCI₂. 6H₂O A
• Pb(NO₃)₂ B
• K₂Cr₂O₇ C
• Ce₂(SO₄)₃ D

Eutrophication causes reduction in

• Dissolved hydrogen A
• Dissolved oxygen B
• Dissolved salts C
• All the above D

A pseudo uni-molecular reaction has order of reaction :

• 3 A
• 2 B
• 1 C
• 0 D

Baking powder has which one of the following formula

• Na₂CO₃ A
• Na₂SO₄ B
• NaHCO₃ C
• K₂CO₃ D

In gases and liquids, temperature is the measure of :

• Average transnational kinetic energies of molecules. A
• Average vibrational kinetic energies of molecules. B
• Average rotational kinetic energies of molecules. C
• None of above D

The rate equation for a reaction is Rate =k[A]. what are unit of K ?

• Mole-1 dm³ S^-1

  A

• Mole dm³ S^-1

  B

• Mole dm³

  C

• S^-1

  D

What is the volume in cm³of 3.01 x 10²³molecules of O₂gas at S.T.P

• 1000 cm³ A
• 11000 cm³ B
• 1120 cm³ C
• 11200 cm³ D

When H₂and I₂are mixed and equilibrium is attained, then

• Amount of HI formed is equal to the amount of H₂dissociated A
• HI dissociation stops B
• The reaction stops completely C
• None of these D

The rate of E₁reaction depends upon

• The concentration of substrate A
• The concentration of nucleophile B
• THe concentration of substrate as well as nucleophile C
• None of the above D

The fourteen elements following actinium are known as

• Lanthanones A
• Lanthanides B
• Rare earths C
• Actinides D

Marble is chemically

• CaCl₂ A
• CaCO₃ B
• Na₂CO₃ C
• NaHCO₃ D

Major food factors are:

• Fats and oils A
• Carbohydrates B
• Proteins C
• All of these D

• Complete conversion of A to B has taken place A
• Conversion of A to B is only 50% complete B
• Only 10% conversion of A to B has taken place C
• The rate of transformation of A to B is just equal to rate of transformation of B to A in the system D

1, 3-Dibromopropane reacts with metallic zinc to form

• Propene A
• Propane B
• Cyclopropane C
• Hexane D