ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which behaves as insulator for animals body?

• Carbohydrates A
• Proteins B
• Fats C
• Skin D

Which of the following elements have the largest radius

• F A
• Cl B
• Br C
• l D

CsF is an ionic compound because:

• High I.P of Cs and high E.A of F. A
• High I.P of Cs and low E.A of F. B
• Low I.P of Cs and high E.A of F. C
• Low I.P of Cs and low E.A of F. D

The intramolecular force in gases are :

• Weak A
• Normal B
• Very weak C
• Strong D

Which set of hybrid orbitals has planar triangular shape

• sp³ A
• sp B
• sp² C
• dsp² D

The mineral CaSO₄.2H₂O has the general name

• gypsum A
• dolomite B
• calcite C
• epsom salt D

• 0.5 A
• 4.0 B
• 2.5 C
• 0.25 D

What is formed when propanone is refluxed with an anhydrous solution of NaBH₄

• Propanal A
• Propan-1-ol B
• Propan-2-ol C
• Propane D

Which of the following compounds will not react with sodium metal to release hydrogen

• CH₃CH₂CH₃ A
• CH₃CH₂OH B
• C₆H₅OH C
• C₆H₅CH₂OH D

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

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

Which of the following element is most reactive

• Li A
• Na B
• K C
• Cs D

Density of aluminium is (g cm^-3):

• B A
• Al B
• Si C
• Ge D

The sample being analyzed is called :

• Electrolyte. A
• Substance. B
• Analyte. C
• All of above. D

The osmotic pressure of solution increases if

• Temperature is decreased A
• Solution constant is increased B
• Number of solute molecules are increased C
• Volume is increased D

Two or more similar monomers combine to form:

• Homopolymer A
• Copolymer B
• Ter Polymer C
• Thermoplastic polymers D

When we perform the same reaction by taking two different initial concentrations of a reactant for a second order reaction then

• Reaction becomes exothermic A
• Energy of activation is different B
• Mechanism of reaction is changed C
• Half life period is changed D

When the 6d orbital is completed the entering electron goes into

• 7f A
• 7 s B
• 7 p C
• 7 d D

Which compound is more soluble in water

• C₂H₅OH A
• Benzene B
• CH₃OCH₃ C
• Hexane D

If a large number of amino acids (hundreds to thousands) are joined by peptide bonds, the resulting product is called

• Dipeptide A
• Tripeptide B
• Polypeptide C
• None of these D

Which one of the following is a product of the reaction between C₆H₅CH₂OH and CH₃COCI

• C₆H₅OCOCH₃ A
• C₆H₅CH₂CI B
• C₆H₅CH₂OCOCH₃ C
• C₆H₅CH₂COCI D

Alkenes combine readily with electrophillic reagents such as halogens giving

• Haloalkanes A
• Gem-dihalides B
• Vicinal dihalides C
• Vinyl halides D

The three dimensional folding and twisting of a polypeptide chain give rise to

• Primary structure A
• Secondary structure B
• Tertiary structure C
• All of these tertiary D

Which one of the following statements about glucose and sucrose is incorrect?

• Both are soluble in water A
• Both are naturally occuring B
• Both are carbohydrates C
• Both are disaccharides D

In cold countries ethylene glycol is added to water in radiators of cars during winter. It results in

• Lowering in b.pt A
• Reducing viscosity B
• Reducing specific heat C
• Lowering in freezing pt D

The ph of 10-3 mole dm-3 of an aqueous solution of H₂SO₄ is :

• 3.0

  A

• 2.7

  B
• 2.0 C

• 1.5

  D

Which one of the following is a water soluble vitamin?

• Naacin A
• Riboflavin B
• Trypsin C
• Ascorbic acid D

When the rate of formation of reactants is equal to the rate of formation of products, this is known as

• Chemical reaction A
• Chemical equilibrium B
• Chemical kinetics C
• None D

Benzene was discovered by first of all:

• Micheal Faraday A
• Hofmann B
• Ainderson C
• Sorenbon D

Isotonic solutions have same

• Molar concentration A
• Molality B
• Normality C
• None of these D

The degree of polarity of molecule is known as its

• Dipole moment A
• Moment arm B
• Bond energy C
• Ionic character D