ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Reaction of Griganard's reagent with CO₂gives:

• Aldehyde A
• Pri-alcohol B
• Sec-alcohal C
• Carboxylic acid D

In alkynes the bonds between carbon atoms are

• All sigma bonds A
• All pi(π) bonds B
• One is sigma and two areπ(pi) bonds C
• One isπ(pi) and two are sigma bonds D

Among the elements given below, the one with highest electropositivity is

• Cu A
• Cs B
• Cr C
• Ba D

The best buffer is prepared when molar concentrations of the salt and acid are equal, then its pH and pKa value are related

• pH = pKa A
• pH < pKa B
• pH > pKa C
• pH x pKa = 14 D

If an endothermic reaction is allowed to take place very rapidly in the air, the temperature of the surrounding air:

• Remains constant. A
• Increase. B
• Decreases. C
• Remain unchanged. D

The addition of HCN to carbonyl compounds is an example of

• Nucleopihlic substituion A
• Electrophilic addition B
• Nueleophilic addition C
• Electrophilic substitution D

Monosaccharides and oligosacchradies are generally called as

• Crystals A
• Sugars B
• Liquids C
• Non-sugars D

Iodoform test is given by:

• Formaldehyde and Higher ketones A
• Formaldehyde B
• Acetaldehyde and methyl ketones C
• Acetaldehyde D

During dehydration of alcohols to alkenes by heating with conc. H₂SO₄, the initial step is

• Formation of an ester A
• Protonation of alcohol molecule B
• Formation of carbocation C
• Elimination of water D

Fe⁺³and Mn²⁺are strong paramagnetic because the number of unpaired electrons in each is

• 4 A
• 5 B
• 6 C
• 7 D

Which bond shows maximum hydrogen bonding with water?

• CH₃OH A
• C₂H₅OH B
• CH₃----O----CH₃ C
• C₆H₅OH D

In CH₄, all the H-C-H bond angles are

• 120° A
• 107° B
• 109° C
• 109.5° D

Poly hydroxyl compounds of aldehyde ketones are:

• Carbohydrates A
• Protiens B
• Fats C
• Lipids D

Properties of metal are:

• Malleable and ductile A
• Form basic oxides B
• Tamish in air C
• All are true D

Iodoethane reacts with sodium in ether, the product formed is

• Pentene A
• Propyne B
• Butene C
• Butane D

The sum of the exponents of the conc. terms in the rate equation is called

• Rate of reaction A
• Order of reaction B
• Specific rate constant C
• Average rate D

When phenol is distilled with zinc dust. It is reduced to

• Benzene A
• Benzaldehyde B
• Toluene C
• Hexanol D

Acetamide is prepared by:

• Heating ammonium acetate A
• Heating methyl cyanide B
• Heating ethyl acetate C
• The hydrolysis of methyl cyanide D

Tripple bond is present in

• O₂ A
• H₂ B
• N₂ C
• Cl₂ D

Which is not the affect of polluted air on environment

• Acid rain A
• Smog B
• Ozone C
• Global warming D

Peroxyacetylnitrate (PAN) is an irritant to human beings and it affects:

• Eyes A
• Ears B
• Stomach C
• Nose D

The empirical formula of a liquid compound is known to be C₂H₄O. What other information is needed to work out its molecular formula?

• The percentage composition of the compound A
• The relative molecular mass of the compound B
• The density of the compound C
• The volume occupied by one mole of the compound D

Which one of the following gases is used for artificial ripening of fruits

• Ethene A
• Ethane B
• Methane C
• Propane D

The stability of acromatic compounds decreases with ------- in the no. of its resonance structure

• Decrease A
• Increase B
• Remain constant C
• Partially decreases D

A reaction is reversible because :

• Products are stable. A
• Reactants are reactive. B
• Products are reactive. C
• Reactants re stable. D

Acetylene is used in the manufacture of

• Rubber A
• Plastic B
• Ethyle alcohol C
• All of these D

Cyanohydrin of which of the following forms lactic acid

• HCHO A
• CH₃COCH₃ B
• CH₃CHO C
• CH₃CH₂CH₂CHO D

• 4 mole per dm³ A
• 2 mole per dm³ B
• 0.33 mole per dm³ C
• 0.67 mole per dm³ D

Which structure shows a tertiary alcohol

• CH₃CH₂OH A
• (CH₃)₂CHOH B
• (CH₃)₃COH C
• CH₂OH D

The oxides of electronegative elements are

• Basic A
• neutral B
• Acidic C
• Amphoteric D