ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which is not a nucleophile

• Benzene A
• Chlorine B
• Ethene C
• Ethanol D

• The value of K_pfalls with a rise in temperature A
• The value of K_pfalls with increasing pressure B
• Adding V₂O₅catalyst increase the equilibrium yield of sulphur trioxide equilibrium yield of sulphur trioxide C
• The value of K_pis equal to K_c D

Which of the following in incorrect?

• FelCl₃is used in the detection of phenols A
• Fehling solution is used in the detection of glucose B
• Tollen's reagent is used in detection of unsaturation C
• NaHSO₃is used in the detection of carbonyl compounds D

Atoms and molecules can either gain or lose electrons, forming charge particles called:

• Positrons

  A

• Photons

  B

• Ions

  C

• Electrons

  D

When a compound X is passed through a dilute alkaline solution of KMnO₄the pink colour of solution is discharged. The compound X is possbibly

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

Carbon monoxide, emitted by automobiles, prevents transport of oxygen in body due

• Combining with oxygen to form carbon dioxide A
• Destruction of hemoglobin B
• Preventing reaction between oxygen and hemoglobin C
• Forming stable compound with hemoglobin D

In the ground state of an atom, the electron is present:

• In the nucleus. A
• In the second shell. B
• Nearest to the nucleus. C
• farthest from the nucleus. D

Zwitter ion is ______ ion an amino acid

• Polar A
• Monopular B
• Dipolar C
• Non polar D

The protein which only yield amino acids and their derivatives

• Simple proteins A
• Complex proteins B
• Derived protein C
• All of these D

Grignard's reagent on treatment with chloramine give

• Acetamide A
• Primary amice B
• Secondary amice C
• Urea D

Which of the following consists of atoms and molecules and are held together by WAHDERWADD forces.

• H2O A
• CO2 B
• Cu C
• MgO D

The value of Plank's constant 'h' is

• 6.625 x 10^-34 A
• 6.625 x 10^-34J sec B
• 6.625 x 10^-34KJ C
• 6.625 x 10^-34K Cal D

How many are the zones through which the charge passes in a rotary kiln?

• 4 A
• 3 B
• 2 C
• 5 D

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

• 0, 1, 2, 3 A
• +3, +2, +1, -1, -2, -3 B
• 0, -1, -2 ,-3 C
• -3, 0, +3 D

Homogenous catalysis is that in which catalyst and reactants are in same phase. Which one of the following reaction is a homogenous catalysis

• 
  A
• 
  B
• 
  C
• 
  D

Which of the following method is most appropriate for the manufacture of methane?

• By reduction of CH2CL2 A
• Wurtz reaction B
• Liquification of natural gas C
• None of these D

Toluene can be oxidized to benzoic acid by

• KMnO₄(alk) A
• K₂Cr₂O₇(acidic) B
• Both C
• None D

The amount of products obtained from the balanced chemical equation is regarded as

• Theoretical yield A
• Actual yield B
• % yield C
• Experimental yield D

Chemistry related to the study of environment affected by the chemicals and pollutants is called:

• Biochemistry A
• Physical chemistry B
• Pharmaceutical chemistry C
• Environmental chemistry D

Selection of filter paper depends upon sizes of particles to be:

• Tested A
• ^Filtered B
• Checked C
• All of above D

The total number of d-bock transition element is

• 10 A
• 14 B
• 40 C
• 30 D

Some non-spontaneous processes can be made to take place by supplying energy to the system from

• Internal source A
• Any source B
• External source C
• All of above D

A solution of two component is called

• Binary solution A
• Dilute solution B
• Original solution C
• Standard solution D

Chief air pollutant which is likely to deplete ozone layer

• Sulphure dioxide A
• Carbon dioxide B
• Nitrogen oxides and chloro fluorocarbons C

The following is an alcohol

• CH3-CH2-OH A
• CH3-O-CH3 B
• CH3COOH C
• All of these D

The bond order O₂molecule is

• 1 A
• 2 B
• 3 C
• Zero D

Out of all the elements of group V-A , the highest ionization energy is possessed by:

• N A
• P B
• Sb C
• Bi D

All the following decompose easily on heating to give oxygen except

• Lead nitrate A
• Potassium chlorate B
• Mercuric oxide C
• Manganese dioxide D

Nitration of phenol gives

• o-nitrophenol A
• p-nitrophenol B
• m-nitrophenol C
• Both o and p-nitrophenol D

Which one of the following properties is not correct for ozone?

• It oxidizes lead sulphides A
• It oxidizes potassium iodide B
• It oxidizes mercury C
• It cannot act as a bleaching agent D