ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Classical smog occurs in palces of

• Excess SO₂ A
• Low temperature B
• High temperature C
• Excess NH₃ D

In which of the following reactions is the inorganic reagent acting as a nucleophile

• 
  A
• 
  B
• 
  C
• 
  D

During the preparation of alkanes the hydrogenation of alkenes or alkynes the catalyst may be

• H₂SO₄ A
• Ni B
• Fe₂O₃ C
• Al₂O₃ D

In the atmosphere, O₂is about

• 10% A
• 15% B
• 21% C
• 25% D

95% ethanol is called:

• Rectified other A
• Diesel B
• Rectified spirit C
• Petrol D

The horizontal rows in the periodic table are called periods. The number of period are

• 5 A
• 6 B
• 7 C
• 8 D

Iodoethane reacts with sodium in ether, the product formed is

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

Which of the following does give violet colour with neutral ferric chloride?

• Acetic acid A
• Salicaylic acid B
• Formine acid C
• Benzoic acid D

Which of the following is a constituent of nylon?

• Adipic acid A
• Styrene B
• Teflon C
• None of these D

If we remove one hydrogen atom from an alkane we obtain a group called

• Acetyle group A
• Formyle group B
• Alkyle group C
• Ketyle group D

Which reagent will distinguish a ketone from an aldehyde

• Br₂ A
• 2, 4-dinitrophenylhydrazine B
• NaBH₄ C
• Tollen's reagent D

Value of rate constant k is specific for a reaction, and varies from reaction to reaction. The value of k of a reaction changes with

• Time A
• Temperature B
• Concentration of reactants C
• Order of reaction D

C₁₈and onward hydrocarbons are normally

• Gases A
• Liquids B
• Solids C
• Plasma D

C- X bond is strong in

• CH₃Cl A
• CH₃Br B
• CH₃F C
• CH₃I D

The apex angle of the folded filter paper is slightly greater is termed as:

• 60 degree A
• 30 degree B
• 45 degree C
• 90 degree D

Which of the followings is not a nulceophile

• OH^- A
• NH₃ B
• C₂H₅O^- C
• Br₂ D

1.0 g pure calcium carbonate was found to require 50 ml of dilute HCl for complete reaction. The strength of HCl solution is given by

• 4 N A
• 2 N B
• 0.4 N C
• 0.2 N D

Water shows maximum density at

• 4°C A
• 0°C B
• 100°C C
• -4°C D

The covalent radius of Cl atom is:

• 99.4 pm. A
• 176.7 pm B
• 38 pm C
• 76 pm. D

In a group the atomic size increase downward due to

• Addition of electronic shells A
• Increase in the proton number B
• Repulsion of electrons C
• All of the above D

Which is volatile liquid?

• HF A
• HCl B
• HBr C
• Hl D

Th IUPAC name of the compound having formula (CH3) 3 C - CH = CH2 is

• 1, 1-Dimethyl-3-butene A
• 1,1,1-Trimethyl-3-propene B
• 3,3,-Dimenthyl-1-butene C
• 3,3,3,-Trimethyl-1-propene D

Born-Haber cycle is an application of

• First of thermodynamics A
• Second law of thermodynamics B
• First law of thermodynamics C
• Hess's law D

• Complete conversion of A to B has taken place A
• Conversion of A to B is only 50% complete B
• Only 10% conversion of A to B has taken place C
• The rate of transformation of A to B is just equal to rate of transformation of B to A in the system D

Alkyl halides ae considered to be very reactive compounds towards nucleophiles because

• They have an electrophilic carbon A
• They have an electrophilic carbon and a good leaving group B
• They have an electrophilic carbon and a bad leaving group C
• They have a nucleophilic carbon and a good leaving group D

The oxides of electronegative elements are

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

What is the maximum mass of aluminium which can be obtained from 240g of aluminium oxide Al₂O₃?

• 26 g A
• 127 g B
• 51 g C
• 108 g D

Polyester resins have special use in:

• Clothing A
• Paints B
• Emulsion C
• Floor covering D

A solution having pH = 4 its OH^-ion concentration in mole dm^-3is

• 1.0 x 10^-4 A
• 1.0 x 10^-10 B
• 1.0 x 10^-14 C
• 1 x 10⁰ D

When electrically is passed through molten Al₂O₃+ Na₃AlF₆and 13.5 gms of Al are deposited, the number of farady must be

• 0.5 A
• 1.0 B
• 1.5 C
• 2.0 D