ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The protection of steel by chrome plating is due to

• Cathodic protection A
• Anodic protection B
• Covering of steel surface C
• Formation of alloy with iron D

Group VI-B of transition elements contains:

• Zn, Cd, Hg A
• Fe ,Ru ,Os B
• Cr, Mo ,W C
• Mn, Te, Re D

Ethyl alcohol may be identified by

• Ring test A
• Iodoform test B
• Tollen's test C
• Bazeyer's test D

Colour of chlorine is

• Pale yellow A
• Greenish yellow B
• Red brown C
• Greyish black D

Which is not a colligative property?

• Osmotic pressure A
• Lowering of vapour pressure B
• Depression of freezing point C
• Elevation of boiling point D

Isopropyl alcohol on oxidation gives

• Acetone A
• Ether B
• Ethylene C
• Acetaldehyde D

A buffer solution of 0.1 molar HCOOH and 0.1 molar HCCONa has pH = 3.78 To is 0.01 molar HCl is added, then pH of the buffer solution becomes

• 2.78 A
• 4.78 B
• 3.78 C
• 3.70 D

Halogens are called.

• salt former A
• Light bearing B
• copper forming C
• None of these 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

The solutions of NaCl and KCl are prepared separately by dissolving same amount of solute in water, which of the following statements is true fro these solutions ?

• KCl solution will have higher boiling point than NaCl solution. A
• Both the solutions have same boiling points. B
• KCl and NaCl solutions possess same vapour pressure. C
• KCl solution possesses lower freezing point than NaCl solution. D

Which one of the following particles has amass 1/1836 time, that of hydrogen?

• Neutron. A
• Proton. B
• Electron. C
• Positron. D

A compound of the formula C₄H₁₀O_{reacts with sodium and undergoes oxidation to give a carbonyl compound which does not reduce Tollen's reagent, the original compound is}

• Diethyl ether A
• n-Butyl alcohol B
• Isobutyl alcohol C
• sec-Butyl alcohol D

In the modern periodic table the elements are placed in the ascending order of their

• Atomic masses A
• Melting points B
• Boiling points C
• Atomic numbers D

Debye forces are present in on of the following pairs:

• Na+ion and water A
• Argon and water B
• Argon and Na+ion C
• Ne and water D

Which is not the poplar reaction

• 
  A
• 
  B
• 
  C
• 
  D

The number of coulombs required for the deposition of 107.870 g of silver is

• 96500 A
• 48250 B
• 193000 C
• 10000 D

Which one is not a pollutant normally?

• Hydrocarbons A
• Carbon dioxide B
• Carbon monoxide C
• Sulphur dioxide D

Carboxylic acids generally exists in cyclic

• Monomers A
• Dimers B
• Trimers C
• Tetrameter D

The filtration process is used to separate solid from

• Liquid A
• Gas B
• Solid C
• All of above D

Hemoglobin contains nearly:

• 10,000 atoms A
• 100 atoms B
• 1000 atoms C
• 1 atom D

The method involved for electrolysis of Na or K salts of carboxylic acids

• Sabatier's sendrens reaction A
• Kolbe's method B
• Clemmensen C
• Wolf kishner reduction D

In H₂O molecule the bond angle is

• 90° A
• 109.5° B
• 107° C
• 104.5° D

Alkanes may be prepared by the reaction of alkyl halides with

• Alcohol A
• Carboxylic acid B
• Grignard reagents C
• None of these D

Vinegar is dilute solution of:

• Acitic acid A
• Formic acid B
• Butyric acid C
• Propionic acid D

• The ionization energy of A is high and electron affinity of B is low A
• The ionization energy of A is low and electron affinity of B is high B
• Both the ionization energy of A and electron off affinity of B are high C
• Both the ionization energy of A and electron affinity of B are low D

Cellulose does:

• Satisfy human appetite A
• Stimulates intestinal peristalsis B
• Gives fibre and bulk to the food C
• All of these D

The reaction between primary amine-chloroform and alcoholic caustic potash is called

• Wurtz reaction A
• Frankland reaction B
• Cannizzaro's reaction C
• Carbylamine reaction D

Molarity of pure water is :

• 33.3 A
• 55.5 B
• 44.4 C
• 66.6 D

Which is the chain isomer of n-pentane

• Isopentane A
• Neopentene B
• N-pentene C
• Isopentene D

Glycogen is stored in

• Animals A
• Plants B
• Soil C
• None of these D