ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Generally ionization energy of atoms decreases by

• Decreases in atomic size A
• Increase in atomic size B
• Increase in nuclear charge C
• None of these D

Propanone is the product obtained by dehydrogenation of

• 2-Propanol A
• 1-Propanol B
• Isobutyl alcohol C
• Propanethoil D

Replacement of hydrogen atom by - SO₃H group in benzene is called

• Nitration A
• Alkylation B
• Sulphonation C
• Acylation D

Phenol is a weak acid. The correct order of acid strength of carboxylic acid, phenol and alcohol is

• Carboxylic acid > phenol > alcohol A
• Carboxylic acid > alcohol > phenol B
• Phenol > carboxylic acid > alcohol C
• Alcohol > phenol > carboxylic acid D

Which is in differnet phase form other metals

• Ni A
• Hg B
• Cd C
• Na D

• HF is stable and does not decompose even at 2000°C A
• HF is stable and slowly decomposes at 2000°C B
• HF is strong acid C
• HF produces equal moles of hydrogen and fluorine D

Sulphuric acid is used

• As fertilizers A
• As dehydrating agent B
• As oxidizing agent C
• All above D

Doberiner arranged the similar elements into

• Pairs A
• Triads B
• Triplets C
• Rows D

B.O.D is connected with

• Organic matter A
• Microbes B
• Mircrobes and organic matter C
• None of the above D

Two elements whose electronegativities are 1.2 and 3.0, the formed between them would be

• Ionic A
• Covalent B
• Coordinate C
• Metallic D

During reaction of O₂and alkenes, a product:

• Glycol A
• Epxide B
• Halohydrin C
• Ethylene glycol D

Allyl chloride on dehydrochlorination gives

• Propadiene A
• Propylene B
• Allyl alcohol C
• Acetone D

Which compound shows more hydrogen bonding?

• C₂H₆ A
• C₂H₅Cl B
• CH₃----O----CH₃ C
• C₂H₅OH D

Chlorobenzene on heating with aqueous NH₃under pressure in the presence of cuprous chloride gives

• Benzamide A
• Nitrobenzene B
• Aniline C
• Chloroaminobenzene D

The addition of HBr is easiest with

• CH2 = CHCl A
• CICH = CHCl B
• CH3 - CH = CH2 C
• (CH3)2 C = CH2 D

When a colourless gas is passed through bromine water only decolourisation takes place the gas is

• SO₂ A
• HBR B
• HCl C
• H₂S D

Property of transition element is :

• Low m.p and b.p A
• Parramagnetism B
• Oxidation state C
• Low binding energies D

From the following values of dissociation constants of four acids which value represents the strongest acid?

• 2 x 10^-2 A
• 0.02 x 10^-1 B
• 3 x 10^-4 C
• 2 x 10^-4 D

Al is the most element in earth crust:

• O A
• Si B
• Al C
• Pb D

Electron affinity of sulphur is

• More than O and Se A
• More than O but less than Se B
• Less than O but more than Se C
• Equal to O and Se D

The homologous series of aldehydes and ketones have general formula:

• C_nH_2nO A
• C_nH_nO B
• C_nH_2n-1O C
• C_nH_nO_n D

Cathode rays emitted from cathode are

• Canal rays A
• Protons B
• Electrons C
• Positrons D

A half reaction can be defines as :

• It always occurs at cathode. A
• Involves only half of a mole of electrolyte. B
• Occurs at one of the electrode. C
• Goes only half way to completion. D

Analytical chemistry is the science of

• Chemical characterization A
• Physical characterization B
• Biological characterization C
• Biochemical characterization D

Ethylene decolorizes cold dilute solution of KMnO₄. This test is known as

• Colouration test A
• Baeyer's test B
• Silver mirror test C
• Ring test D

Which is used as an antifreeze?

• Glycol A
• Ethyl alcohol B
• Water C
• Methanol D

Which of the following is not a synthetic polymer?

• Polyethylene A
• PVC B
• Nylon C
• Cellophane D

The shape of gaseous SnCl₂is

• Tetrahedral A
• Linear B
• Angular C
• T-shaped D

Which is a component of macronutrient?

• Zn A
• N B
• Mo C
• Cl D

• Addition Elimination A
• Addition Reduction B
• Elimination Reduction C
• Substitution Elimination D