ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

6-d series is in the period :

• 4th A
• 5th B
• 6th C
• 7th D

Which of these reactions is shown by buranone, CH₃COCH₂CH₃

• On warming with acidified potassium dichromative (IV) the solution turns green A
• On heating with Fehling's reagent a red precipitate is formed B
• With 2,4-dinitrophenlhydrazine reagent an orange precipitate is formed C
• With hydrogen cyanide an aldehyde is formed D

Which of the following sulphates has the highest solubility in water

• BaSO₄ A
• CaSO₄ B
• MgSO₄ C
• BeSO₄ D

Strong reducing agents gave

• Greater positive value of standard reduction potential A
• Greater negative value of standard reduction potential B
• Lesser positive value of standard reaction potential C
• None of these D

The structure of ICI₂is

• Trigonal A
• Trigonal bipyramidal B
• Octahedral C
• Square planar D

Naphthalene, iodine and NH_{4 can :}

• Sublime. A
• Both (a) and (c). B
• Crystallize. C
• None of above. D

Nitrogen in the atmosphere is:

• 78% A
• 21% B
• 0.9% C
• 0.03% D

One mole of C₂H₅OH contains the number of H-atoms

• 6.02 x 10²³ A
• 3.61 x 10²⁴ B
• 1.81 x 10²⁴ C
• 6.02 x 10²⁴ D

• Hear of reaction A
• Heat of formation B
• Heat of neutralization C
• Heat of combustion D

The forced which holds together two or more atoms or ions to form a large variety of compounds in called:

• A chemical bond. A
• An ionic bond. B
• A covalent bond. C
• A coordinate bond. D

SN₂ reaction has order of reaction :

• First A
• Second B
• Third C
• Zero D

3.01 x 10²²Ag⁺ions is present in

• 85 grams AgNO₃ A
• 0.85 g AgNO₃ B
• 8.5 g AgNO₃ C
• 18.5 g AgNO₃ D

• 
  A
• 
  B
• 
  C
• 
  D

A solution of two component is called

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

Introduction of a second methyl group in methylbenzene will give how many isomeric dimethyllenzenes

• 2 A
• 1 B
• 3 C
• 4 D

Which has soapy touch?

• Na2B4O7 A
• H3BO3 B
• Ca2B6O11 C
• HBO2 D

Which isomers of C₅H₁₁OH gives, on dehydration, the greatest number of different alkenes

• 
  A
• 
  B
• 
  C
• 
  D

Which one of the following is weakest inter molecular force?

• Dipole induced dipole forces A
• Ionic dipole forces B
• Electrostatic forces b/w ions C
• Dipole dipole forces D

Which one of the following reaction rate is effected by the light

• 
  A
• 
  B
• 
  C
• 
  D

Each of the following compounds is effective as a refrigerant. The release of which one of these causes the greatest depletion of the ozone layer

• CCl₂F₂ A
• CH₃OCH₃ B
• CH₃CHF₂ C
• CH₃CH₂CH₃ D

Ethylene polymerizes at 100 atm pressure and 400°C to give

• Polybenzene A
• Polyalcohol B
• Polypropylene C
• Polyethylene D

N₂3H₂⇌ 2NH₃

_{Which of the following change will favorthe formation of more}NH₃at equilibrium in above reaction :

• By adding NH_3. A
• By removingH_2. B
• By decreasing pressure. C
• By increasing pressure. D

Which is not a method for solid waste management

• Landfill A
• Incinerating B
• Recycling C
• None of these D

The common reagent used in oxidation of Alcohols is.

• K2Cr2O7 A
• K2CrO4+H2SO4 B
• H2SO4 C
• K2Cr2O7+ H2SO4 D

Industrial effuents have toxic synthetic organic compounds as well as heavy metals like

• Pb A
• Cr B
• Hg C
• All of these D

The alkaline earth elements have in their s-orbital

• One electron A
• Two electron B
• No electron C
• Three electron D

Heat of neutralization of weak acid and a strong base is

• 13.7 Kcal A
• Less than 13.7 Kcal B
• Greater than 13.7 Kcal C
• None of these D

95% ethanol is called:

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

Allyl chloride on dehydrochlorination gives

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

Which is a component of micro nutrient?

• N A
• Zn B
• P C
• K D