ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Simple sugars are :

• Monosaccharides A
• Disaccharides B
• Oligo saccharides C
• Trisaccharides D

When alkyl is treated with chlorine in the presence of sunlight

• 1,3 dichloroproduct is formed A
• 1,4 dichloro product is formed B
• 1,3,5 trichloro product is formed C
• Only alkyl group is substituted D

The rate equation for a reaction is Rate =k[A]. what are unit of K ?

• Mole-1 dm³ S^-1

  A

• Mole dm³ S^-1

  B

• Mole dm³

  C

• S^-1

  D

Which of the following is not isoelectronic?

• Na⁺ A
• Mg²⁺ B
• O^2- C
• Cl^- D

Factors affecting denaturation of proteins:

• Change in temp and pH A
• Strong reducing agent B
• Strong oxidizing agent C
• All of these D

"Each different compound should have a different name" was published by IUPAC system of nomenclature in

• 1892 A
• 1830 B
• 1947 C
• 1979 D

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

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

For which mechanisms, the first step involved is the same:

• E₁ and E₂ A
• E₂and SN₂ B
• E₂ and E₁ C
• E1 and SN₁ D

Halogens are called

• Salt former A
• Light bearing B
• Copper forming C
• none of these D

Which teat is not given by both glucose and fructose

• Give yellow ppt of CHl₃with alkaline aqueous iodine A
• With 2, 4-DNPH give yellow ppt of hydrazone B
• Evolve H₂gas with Na metal C
• Oxidised with [Ag(NH₃)₂]⁺i.e. Tollen's reagent D

Which of the following has polar bond

• O₂ A
• N₂ B
• HCl C
• Cl₂ D

Baking powder has which one of the following formula

• Na₂CO₃ A
• Na₂SO₄ B
• NaHCO₃ C
• K₂CO₃ D

Which of the following compounds gives red precipitate with AgNO₃?

• Kl A
• K₂CrO₄ B
• NaBr C
• NaNO₃ D

Which causes water pollution?

• Smoke/fly ash A
• Automobile exhausts B
• Aeroplnes C
• 2,4-D and pesticides D

A transition element is defined as an element of 3d series

• Which is metal A
• Which has one stable ion B
• Which has two stable ions C
• Which has at least one stable ion with incomplete d-orbital D

The most stable phosphorus allotrope is

• White A
• Red B
• Black C
• All D

• 0.60 A
• 1.67 B
• 0.66 C
• 2.6 D

Gases of air always remain in random motion and do not settle due to :

• Difference in molecular masses of air gases. A
• Difference in partial pressure of gas molecules. B
• Unequal number of different gas molecules. C
• Elastic collision of gas molecules. D

Whenever a week base is dissolved in water, it give its conjugate acid. similarly a weak acid in water produces its conjugate base. This conjugate acid-base pair concept is stated by

• Law of mass action A
• Le-charlier's principle B
• Common ion effect C
• Lowery Bronsted concept D

In cold countries ethylene glycol is added to water in radiators of cars during winter. It results in

• Lowering in b.pt A
• Reducing viscosity B
• Reducing specific heat C
• Lowering in freezing pt D

Catenation is a process in which carbon shows the properties of making

• Multiple bonds A
• Hybridization B
• Long chains or rings of carbon atom C
• Showing isomerism D

Pure water does not conduct electricity because it

• Has low boiling point A
• Is almost unionized B
• Is neutral C
• Is readily decomposed D

The general formula of amino acids is

• 
  A
• 
  B
• 
  C
• 
  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

In aldol condensation reaction, a double bond is formed between ______ and ______ carbon atoms

• αandβ A
• αandα B
• αand Y C
• None of these D

Which are being formed by alkali metals?

• oxides A
• nitrides B
• carbides C
• peroxides D

Transition elements form which type of bond

• Ionic bonds only A
• Covalent bonds only B
• Ionic and covalent bonds C
• Polar bonds D

The function of salt bridge in the galvanic or voltaic cell is to

• Carry out oxidation at anode A
• To carry out reduction at cathode B
• Carry out electrolysis C
• To prevent the net charge accumulation in either of the half cells D

Angle 120° is observed in molecules :

• CH₄ A
• CH_3-CH₃ B
• CH -CH C
• CH_{2 =}CH₂ D

The filtration process is used to separate solid from:

• Liquid A
• Gas B
• Solid C
• All of above D