ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

What is the volume in cm³of 3.01 x 10²³molecules of O₂gas at S.T.P

• 1000 cm³ A
• 11000 cm³ B
• 1120 cm³ C
• 11200 cm³ D

When chloroform is boiled with NaOH, it gives

• Formic acid A
• Trihydroxymethane B
• Acetylene C
• Sodium formate D

Copolymer is

• Nylon-6 A
• Nylon 66 B
• PMMA C
• Polyethene D

Misch mental is

• An alloy of Aluminium A
• A mixture of chromium and lead chromate B
• An alloy of lanthanoid metals C
• An alloy of copper D

Which of the following has linear shape?

• SP A
• SP² B
• SP³ C
• None of the above D

Sintered glass is a porous material use for :

• Absorpton A
• Decoration. B
• Filtration. C
• All of above. D

At present the number of cement factories is Pakistan are

• 20 A
• 22 B
• 25 C
• 30 D

Sulphonation of benzoic acid produces mainly

• o-Sulphobenzoic acid A
• m-sulohobenzoic acid B
• p-Sulphobenzoic acid C
• o-and p-Sulphobenzoic acid D

Reaction of Grignard's reagent eith aldehyds other formaldehyde gives: Reaction of Grignard's reagent with formaldehyde gives:

• Pri-alcohol A
• Sec-alcohol B
• Ter-alcohol C
• Carboxylic D

The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with the rule

• Hund's rule A
• Markowvikov's rule B
• Pauli's exclusion principle C
• Auf ban principle D

The experimental relationship between a reaction rate and the concentration of reactants is called

• Order or reaction A
• Rate law B
• Activated complex C
• Molecularity D

Kolb's method has limited synthetic applications due to

• Expensive catalysis A
• Slow reaction B
• Number of side products produced C
• Salts used are very expensive 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 conversion of n-hexane into benzene by heating in the presence of CO, is called

• lsomerization A
• Aromatization B
• Dealkylation C
• Rearrangement D

Wolf-kishner reduction is used for the reduction of

• Nitro compounds A
• Carboxylic acids B
• Carbonyl compounds C
• Olefins D

Which reagent is used to reduce a carboxylic group to an alcohol

• H₂/Ni A
• H₂/Pt B
• NaBH₄ C
• LiAIH₄ D

The wave number of the light emitted by a certain source is 2 x 10⁶m^-1. The wavelength of this light will be

• 500 nm A
• 500 m B
• 200 nm C
• 5 x 10⁷m D

An electric current is passed through silver voltameter connected to a water voltmeter. The cathode of the silver voltameter is 0.108 g more at the end of the electrolysis. The volume of oxygen evolved at STP is

• 56 cm³ A
• 550 cm³ B
• 5.6 cm³ C
• 11.2 cm³ D

Which term was derived from "aroma":

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

• Total pressure A
• Amount of A₂and B₂ B
• Temperature C
• Catalyst D

In a group on going downward, polarizability generally:

• Decreases A
• Increases B
• Remain constant C
• Negligible D

Which group elements are the least metallic in nature?

• IV-A A
• V-A B
• VI-A C
• VII-A D

The structure of benzene is

• Hexagonal A
• Pyramidal B
• Square planer C
• Tetrahedral D

Hydrogen bond is the strongest between the molecules of

• HF A
• HCl B
• HBr C
• HI D

The isomers due to the unequal distribution of carbon atoms on either side of the functional group belonging to the same homologous series are called

• Functional isomers A
• Position isomers B
• Chain isomers C
• Metamers D

Ethyl acetate is obtained when methyl magnesium iodide reacts with

• Ethyl formate A
• Ethyl choroformate B
• Acetyl chloride C
• carbondioxide D

Sulphuric acid has great affinity for water because

• It hydrolyses the acid A
• It decomposes the acid B
• Acid forms hydrates with water C
• Acid decomposes water D

In endothermic reactions, the heat contents of the:

• Products equal to the reactants. A
• Reactants more than that of products. B
• Products more than that of reactants C
• Both (b) and (c) D

• Low pressure A
• High pressure B
• High temperature C
• High concentration of SO₂ D

An aqueous solution is neutral when its

• pH = 14 A
• pH = zero B
• pH = 7 C
• Kw = 10^-7 D