ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Methyl alcohol is not used

• As a solvent A
• A an anti-freezing agent B
• As a substitute for petrol C
• For denaturing of ethyl alcohol D

The main source of natural fibre is

• Animal fibres A
• Vegetables fibres B
• Mineral fibres C
• All of the above D

A free radical reaction takes place in three steps, initiation, propagation and terminations. Which of the following expression represents a propagation step

• 
  A
• 
  B
• 
  C
• 
  D

Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding?

• Orbital overlap will not occur A
• Bonding will not occur B
• Both (A) and (B) are correct C
• None of the above are correct D

Grignard reagent is prepared by the reaction of magnesium metal with alkyl halide in the presence of

• Alcohol A
• Water B
• Suephuric acid C
• Dry ether D

De halogenatiion of tetrahalides happens in the presence of active metal like

• Zn A
• Mg B
• Both a and b C
• None of them D

The hydroxyl derivatives of aromatic hydrocarbons which have the -OH group directly bonded to the ring C-atom are called

• Alcohols A
• Ketones B
• Esters C
• Phenols D

Components of environment are:

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

The rate of a chemical reaction is directly;y proportional to product of molar concentration of reaction substance it is called :

• Low of conservation of energy. A
• Law of mass action. B
• Rate law . C
• Active mass rule. D

How many moles of oxygen, O₂are needed for the complete combustion of two moles of butane C₄H₁₀?

• 2 A
• 8 B
• 10 C
• 13 D

During nitration of benzene, the active nitrating agent is:

• NO₃^-1 A
• NO₂₊ B
• NO₂^-1 C
• HNO₃ D

The volume of a gas at 0^oC is 100 m3, what will be the volume of the same gas 546 ^oC, assuming that pressure remains constant.

• 5460 cm3 A
• 300 cm3 B
• 200 cm3 C
• 546 cm3 D

Zwitter ion is ______ ion an amino acid

• Polar A
• Monopular B
• Dipolar C
• Non polar D

During the preparation of alkanes the hydrogenation of alkenes or alkynes the catalyst may be

• H₂SO₄ A
• Ni B
• Fe₂O₃ C
• Al₂O₃ D

In the ground state of an atom the electron is present

• In the nucleus A
• In the second shell B
• Nearest to the nucleus C
• Farthest from the nucleus D

Which statement is incorrect for balancing of redox reactions by ion-electron method

• The reaction is splitted into two half reactions A
• H₂O and H⁺ions are added for acidic or neutral reaction to balance O and H atoms B
• To balance H, HCi, is added C
• To balance O and H in the alkaline reaction OH^-added D

The ionization potential is lowest for the

• Halogens A
• Inert gases B
• Alkaline earth metals C
• Alkali metals D

Which of the followings is not a nulceophile

• OH^- A
• NH₃ B
• C₂H₅O^- C
• Br₂ D

Which is not an essential amino acid

• Leucine A
• Methionine B
• Histidine C
• Lysine D

Which term was derived from "aroma":

• Atom A
• Hydrocarbons B
• aromatic C
• aliphatic D

The strongest hydrogen bond is in

• HF A
• HCl B
• HBr C
• Hl D

The ratio of volume to temperature on Kelvin scale is constant according to

• Charle's law A
• Newton's law B
• Coulomb's law C
• Boyle's law D

Shape of CIO₃is

• Triangular pyramidal A
• Tetrahedral B
• Triangular planar C
• Triangular bipyramidal D

• The value of K_pfalls with a rise in temperature A
• The value of K_pfalls with increasing pressure B
• Adding V₂O₅catalyst increase the equilibrium yield of sulphur trioxide equilibrium yield of sulphur trioxide C
• The value of K_pis equal to K_c D

Which one of the following is not an alkali metal?

• Francium A
• Caesium B
• Rubidium C
• Radium D

The wave number of light emitted by a certain source is 2 x 10⁵m. The wavelength of this light will be:

• 500 NM. A
• 500 M. B
• 200 NM. C
• 5 x 10⁷m D

which of the following has smaller size:

• Fe+³

  A

• Fe+²

  B

• Fe+¹

  C

• Fe

  D

The reagent which forms crystalline osazone derivative when treated with glucose is

• Fehling solution A
• Phenyl hydrazine B
• Benedict solution C
• Hydroxyl amine D

Some Non-spontaneous process can be made to take place by supplying energy to the system from :

• Internal source. A
• Any source. B
• External source. C
• All of above. D

Two elements whose electronegativities are 1.2 and 3.0, the formed between them would be

• Ionic A
• Covalent B
• Coordinate C
• Metallic D