ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which one gives acidic reactions?

• CH₃----C≡C-------CH₃ A
• CH₃-----CH₂-----HC=CH----CH₂ B
• CH₃----CH=CH₂ C
• CH₃-----C≡CH D

Quantum number value for 2p orbitals are:

• n=2 ,l=1 A
• n=1 ,l=2 B
• n= ,l=0 C
• n=2 ,l=0 D

Cracking normally gives smaller ______

• Alkanes A
• Alkenes B
• Alkynes C
• Both a and b D

Elimination bimolecular reactions involve:

• First order Kinetics A
• Third order kinetics B
• Zero order kinetics C

Composition of clay in cement is

• 25% A
• 50% B
• 75% C
• 80% D

The order of dehydration of alcohol

• 10> 20> 30 A
• 10> 30> 20 B
• 20> 30> 10 C
• 30> 20> 10 D

Plaster of pares is obtained by heating

• Gypsum A
• Epsom B
• Lime stone C
• Dolomite D

Which alcohol gives only one oxidation product when wormed with dil acidified K₂Cr₂O₇

• Butan-1-ol A
• Butan-2-ol B
• 2-methyl propan-1-ol C
• 2-methyl propan-2-ol D

The carbon atom of a carbonyl group is

• Sp hybridized A
• Sp²hybridized B
• Sp³hybridized C
• None of these D

A polymer may be

• Homopolemer A
• Co-polymer B
• Terpolymer C
• All of these 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

The C-C bond angles in benzene ring are

• 119° A
• 120° B
• 121° C
• None D

Almost forward reaction is complete when value of k_{c :}

• Neither larger nor very small. A
• Very small. B
• Very large. C
• Negligible. D

Which of the following cannot conduct electricity :

• NaCl fused. A
• NaCl(aq)
  B
• NaCl(Solid)
  C
• Both (b) and (c) D

Rearrangement of an oxime to an amide in the presence of strong acid is called

• Curtius rearrangement A
• Fries rearrangement B
• Beckman rearrangement C
• Aldol condensation D

Which of the following is used as disinfectant

• K₂Cr₂O₇ A
• KMnO₄ B
• K₂MnO₄ C
• K₂CrO₄ D

Methanol is prepared from CO and H_{2 using catalyst:}

• ZnO A
• Cr₂O₃ B
• Pt C
• Ni D

Which of the following is a carbonate are?

• Pyrolusite A
• Malchite B
• Diaspore C
• cassiterite D

The toxic organic compounds and heavy metals and metalloids results in contamination of

• Surface water A
• Ground water B
• Both surface and ground water C
• Neither surface nor ground waters D

• Condensation A
• Electrophilic substitution B
• Free radical substitution C
• Nucleophilic substitution D

• Treatment with HCN followed by acid hydrolysis A
• Oxidation of acetaldehyde followed by basic hydrolysis B
• Treatment with HCN followed by reduction C
• Treatment with HCN followed by oxidation D

Components of environment are:

• Atmosphere A
• Hydrosphere B
• Lithosphere C
• All of these D

The only non-metal in liquid form is

• S A
• Cl B
• Br C
• P D

Hydrogen bond is the strongest between the molecules of:

• HF A
• HCl B
• HBr C
• Hl D

The rate of reaction :

• Remain same as reaction proceeds. A
• May decrease or increase as reaction proceeds . B
• Increase as reaction proceeds. C
• Decreases as reaction proceeds. D

Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively

• 12 and 4 A
• 16 and 5 B
• 16 and 4 C
• 12 and 5 D

Potassium superoxide has a use in breathing equipment in space crafts. The balanced equation for the reaction is

• 
  A
• 
  B
• 
  C
• 
  D

Acidification of the soils due to addition of synthetic nitrogen fertilizer, is corrected by using

• Gypsum A
• Sodium nitrate B
• Limestone C
• Potassium nitrate D

DDT is a:

• Fungicide A
• Insecticide B
• Herbicide C
• All D

An oil or fat with no double bond have iodine number:

• Zero A
• 100% B
• 50% C
• Minimum D