ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

• 99.2% A
• 99.5% B
• 90.5% C
• 96.2% D

According to VSEPR theory, the shape of the water molecule is

• Octahedral A
• Distorted tetrahedral B
• Planar triangle C
• Linear D

Ozone is not

• An allotrope A
• A powerful oxidizing agent B
• Paramagnetic C
• A bent molecule D

Which represents nucleophilic aromatic substitution reaction?

• Reaction of benzene with Cl₂in sunlight A
• Benzyl bromide hydrolysis with water B
• Reaction of NaOH with dintrofluoro benzene C
• Sulphonation of benzene D

The solubility of KCIO₃salt in water is decreased by adding

• NaCIO₃ A
• NaCI B
• KCIO₄ C
• KCI D

In CH₄, all the H-C-H bond angles are

• 120° A
• 107° B
• 109° C
• 109.5° D

• Three times A
• Six times B
• Nine times C
• Two times D

The solution left after the formation of crystals is called :

• Residue. A
• Filtrate. B
• Mother liquor. C
• None of these. D

A graph between P and PV at constant temperature and number of mole is parallel to

• y axis A
• z axis B
• x axis C
• pressure axis D

Which of the following statements is not true?

• Isotopes with even atomic masses are comparatively abundant A
• Isotopes with even atomic masses are comparatively abundant B
• Isotopes with even atomic masses and even atomic numbers are comparatively abundant C
• Isotopes with even atomic masses and odd atomic number are comparatively abundant D

When a nitrogeneous base combine with a sugar it is called

• Ribose A
• Nucleotides B
• Nucleoside C
• None D

Octane number can be changed by

• Isomerisation A
• Alkylation B
• Cyclisation C
• All of these D

The fiber which is made from acrylonitrile as monomer:

• PVC A
• Rayon Fiber B
• Acrylic fiber C
• Polyester fiber D

Al is the most element in earth crust:

• O A
• Si B
• Al C
• Pb D

The electrophile in aromatic sulphonation Is

• H₂SO₄ A
• HSO₄^- B
• SO₃ C
• SO₃⁺ D

When rain is accompanied by a thunderstorm, the collected rain water will have a pH value

• Uninfluenced by occurrence of thuderstorm A
• Which depends on the amount of dust in air B
• Slightly lower than that of rain water without thunderstorm C
• Slighlty higher than that when the thunderstom is not there D

The use of tetra ethyl lead in petrol as an efficient antiknock agent is being discouraged. Which reason is correct

• It is costly A
• It damages the engine B
• Pb is difficult to obtain in bulk quantities C
• The combustion product, lead, causes air pollutions D

In ter-butyl alcohol, the tertiary carbon is bonded to

• Two hydrogen atoms A
• Three hydrogen atoms B
• One hydrogen atoms C
• No hydrogen atom D

Quantum number value for 2p orbitals are:

• n=2 ,l=1 A
• n=1 ,l=2 B
• n= ,l=0 C
• n=2 ,l=0 D

In the manufacture of iron from haematitie,limestone is added to act as

• Flux A
• A reducing agent B
• Slag C
• An oxidizing agent D

Which of the following reactions occur at moderate rate :

• Rusting of iron A
• Chemical weathering of stone work of buildings by acidic gases in atmosphere. B
• Hydrolysis of an ester C
• Fermentation of sugars D

Which of the following compounds does not react with NaHSO₃?

• C₆H₅CHO A
• Acetophenone B
• Acetone C
• Acetaldehyde D

Any other aldehyde except formaldehyde on reaction with Grignard's will produce

• Secondary alcohol A
• Primary alcohol B
• Tertiary alcohol C
• Aromatic alcohol D

Which of the following is a pseudo solid

• CaF₂ A
• Glass B
• NaCl C
• All D

Aldehydes are oxidizes are to give:

• Primary alcohol A
• Sec-alcohol B
• Ter-alcohol C
• Carboxylic acid D

Which element does not belong to 3d transition series

• Ti A
• V B
• Mn C
• Te D

Use of glycol as anti freeze in the automobile is an important application of

• Colligative property A
• Raoult's law B
• Fractional crystallization C
• Prrhenivs law D

Which are used as essences (flowers)?

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

Buffers having pH less than 7 are made

• Mixture of weak acid + salt of it with strong base A
• Mixture of weak acid + salt of it with weak base B
• Mixture of weak base + salt of it with strong acid C
• Mixture of weak base + salt of it with weak base D

Ethyl chloride on treatment with aqueous alkali gives

• Ethane A
• Ethene B
• Ethanal C
• Ethanol D