ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The self linking property of carbon is called as

• Linking polymerization A
• Addition B
• Catenation C
• Elimination D

The change in concentration of reactant or product per unit time is called :

• Rate constant. A
• Rate of reaction. B
• Rate equation. C
• Rate law. D

Major component in cement is :

• SiO₂ A
• Lime B
• Al₂O₃ C
• MgO D

The largest number of molecules are present in

• 3.6 g of H₂O A
• 4.8 g of C₂H₅OH B
• 2.8 g of CO C
• 5.4 g of N₂O₅ D

Purine derivative among the following bases is

• Thymine A
• Uracil B
• Guanine C
• Cytosine D

A special application of the Hess's law to binary ionic compounds of M⁺X^-type in calculation of their lattice energies is

• Enthalpy of reaction A
• Born-haber cycle B
• First law of thermodynamics C
• Enthalpy of combustion D

In 1903 Arthur Lapeworth became the first chemist to investigate a reaction mechanism. The reaction he investigated was that of hydrogen cyanide with propanone. What do we now call the mechanism of this reaction

• Electrophilic addition A
• Electrophilic substitution B
• Nucleophilic addition C
• Nucleophilic substitution D

What is the name of the comlex [Ni(CO)₄]

• Tetracarbonylnickel (o) A
• Tetracabonylnickel B
• Tetracabonylnickel (II) C
• Tetracabonylnickel (IV) D

Posphorus belongs to a group

• III-A A
• IV-A B
• V-A C
• VI-A D

]Which of the following is a pseudo solid?

• Atoms of He is gaseous stat at high temperate. A
• Molecules of water in liquid state. B
• Molecules of solid l₂ C
• Molecular of hydrochloric acid gas D

• High temperature A
• Low temperature B
• Low pressure C
• High pressure D

The wave number of the line emitted is 109.678 x 10⁵m^-1in the Lyman series when electron transition occurs

• 
  A
• 
  B
• 
  C
• 
  D

Complete combustion of alkane yields

• CO₂+ H₂O A
• CO₂+ heat B
• CO + H₂O heat C
• CO₂+ H₂O + heat D

Resonance energy of benzene is (in KJ mol^-1)

• 120 A
• 150 B
• 170 C
• 180 D

Which of the following is correct?

• Reduction of any aldehyde gives secondary alcohol A
• Reaction of vegetable oil with H₂SO₄gives glycerine B
• Alcoholic iodine with NaOH gives iodoform C
• Sucrose on reaction with NaCl gives invert sugar D

Reaction takes place at anode is

• Ionization A
• Reduction B
• Oxidation C
• Hydrolysis D

A polymer may be

• Linear A
• Branched B
• Cross linked C
• All of these D

The prosthetic group in glycoprotein is

• Carbohydrate A
• Fat B
• Vitamin C
• Nucleic acid D

Alkyl halides when reduced with nascent hydrogen in the presence of Zn + HCI, are converted to

• Alkynes A
• Alkenes B
• Alkanes C
• Alcohol D

Which of the following molecules has zero dipole moment>

• H₂O A
• CHCl₃ B
• BF₃ C
• NH₃ D

Complete the reaction : KMnO₄+FeSO₄+H₂SO₄

• K₂SO₄+MnSO₄+Fe₂O+H₂O A
• K₂SO₄+MnSO₄+Fe₂(SO₄)+H₂ B
• K₂SO₄+MnSO₂+Fe(SO₄)+H₂O C
• K₂SO₄+MnSO₄+Fe₂(SO₄)+H₂O D

______ are called biocatalysts

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

Which is not true with respect to cathode rays?

• A stream of electrons A
• Charged particles B
• Move with speed as that of light C
• Can be deflected by magnetic fields D

Newspaper can be recycled again and again by how many times?

• 2 A
• 3 B
• 4 C
• 5 D

Crystalline form of sulphur stable at room temperature is

• Rhombic sulphur A
• Monoclinic sulphur B
• Plastic sulphur C
• Prismatic sulphur D

Ecology is a science of environment and deals specially with

• Stratosphere A
• Biosphere B
• Lithosphere C
• Hydrosphere D

Bleaching powder may be produced by passing chlorine over

• Calcium carbonate A
• Hydrated calcium sulphate B
• Anhydrous calcium sulphate C
• Calcium hydroxide D

Which of the following equations represents the action of heat on NaHCO₃

• 
  A
• 
  B
• 
  C
• 
  D

Phosphorous helps the growth of

• Root A
• Leave B
• Stem C
• Seed D

XeF₄has shape of

• Sphere A
• Trigonal bipyramidal B
• Tetrahedral C
• Square planar D