ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Gammexane is

• Chlorobenzene A
• Benzyl chloride B
• Brommobenzene C
• Benzene hexachloride D

Preparation of vegetable ghee involves

• Halogenations A
• Hydrogenations B
• Hydroxylation C
• Dehydrogenations D

Which of the following sets of atomic numbers belong to that of the alkali metals?

• 1,12,30,4,62 A
• 37,19,3,55 B
• 9,17,35,53 C
• 12,20,56,88 D

Which bond is most stable

• C - Cl A
• C - F B
• C - Br C
• C - I 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 these D

• 
  A
• 
  B
• 
  C
• 
  D

The cell which generates electricity as a result of spontaneous oxidation-reduction reaction is called

• Electrolytic cell A
• Nelson's cell B
• Galvanic cell C
• Down's cell D

A food chemist wants to create the odour of pineapples for a product. An ester with this odour has the formula C₃H₇COOC₂H_5.Which pair of reagents would produce this ester

• C₂H₅CI and C₃H₇COOH A
• C₂H₅OH and C₃H₇CONH₂ B
• C₂H₅OH and C₃H₇COOH C
• C₃H₇OH and C₂H₅COCI D

The amino acids which human body can synthesize are called ______ amino acid

• Essential A
• Non essential B
• Acidic C
• Basic D

The geometry of 4 sp³hybrid orbitals on an atom is

• Square planar A
• Tetrahedral B
• Trigonal planar C
• Linear D

Solvent extraction method is a particularly useful technique of separation when the product to be separated is:

• non-volatile or thermally unstable. A
• volatile or thermally stable. B
• non-volatile or thermally stable. C
• volatile or thermally unstable. D

Which of the following fertilizers is useful for paddy rice

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

The simplest separating unit of a polymer is called:

• Monomer A
• Dimer B
• Trimmer C
• Macromer D

Wohler synthesized first of all the organic compound:

• Carbohydrates A
• Urea B
• Aniline C
• Toluene D

The number of bonds in nitrogen molecule is

• 
  A
• 
  B
• 
  C
• 
  D

Among the nitrogen containing fertilizer, the one with about 82% nitrogen content is

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

A carbon atom carrying a postitive charge and attached to three other atoms of groups is called

• Caronium ion A
• Carbanion B
• Oconium ion C
• Carba ion D

In the electronic configuration of Cr one electron from 4s sub-shell is transfered to 3d sub-shell because

• The 3rd orbital is of lower energy than 4s A
• The 4s orbital is of equal energy to 3d orbital B
• The half filled d-subshell is more stable than incomplete d-sub shell C
• 6 unpaired electrons make Cr more paramagnetic D

During nitration of benzene, the active nitrating agent is

• NO3 A
• NO2+ B
• NO2- C
• HNO3 D

Which of the following elements is not stable:

• Xe A
• Ar. B
• Kr. C
• Li. D

A one thousand dm³sample of water contains one gram of iron (iii) ions what is the concentration in parts per million of Fe^3f(eq) in parts per million

• 0.001 A
• 0.01 B
• 0.1 C
• 1.0 D

The concentration of reactants is increased by x, then equilibrium constant K becomes

• ln K/x A
• K/x B
• K + x C
• K D

Which formula represents the organic compound formed by the reaction of propanoic acid with methanol in the presence of concentrated sulphuric acid as a catalyst

• CH₃CH₂COCH₃ A
• CH₃CH₂CO₂CH₃ B
• CH₃CO₂CH₂CH₃ C
• CH₃CH₂CH₂CO₂CH₃ D

Components of environment are:

• Atmosphere A
• Hydrosphere B
• Lithosphere C
• All of these D

Kekule structures contributed towards actual structure of benzene

• 60% A
• 70% B
• 80% C
• 90% D

The energy units in which heat changes usually expressed in SI-system are

• Joule A
• Calorie B
• Kilo Joule C
• Both a and c D

The solution of which acid is used for seasoning of food

• Formic acid A
• Acetic acid B
• Benzoic acid C
• Butanoic acid D

The catalyst,. which is used as specialist for cracking, are

• Aluminates A
• Alumlnosilicates B
• Aluminium slats C
• All can be used D

Which of the following is a polyamide?

• Nylon A
• Orlon B
• Teflon C
• Terylene D

Carbon atom holding halogen in aryl halides is

• sp²-hybridesed A
• sp³-hybridesed B
• sp-hybridesed C
• sp³d-hybridesed D