ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Lithium reacts with air to form

• Peroxide A
• Normal oxide B
• Superoxide C
• None of these D

The rigid rocket part of earth crust called lithosphere extends upto a depth of:

• 10 km A
• 100 km B
• 1000 km C
• 1500 km D

Which salt is used for preserving food

• BaCl₂ A
• CaCl₂ B
• NaCl C
• Na₂SO₄ D

Linear shape is associated with set of hybrid orbitals?

• sp A
• sp2 B
• sp3 C
• dsp2 D

Lead accumulator stops discharging current when

• Lead at anode converted to PbO₂ A
• PbO₂at cathode converted to Pb B
• Both electrodes are completely covered with PbSO₄ C
• Both electrodes are completely covered with Pb(OH)₂ D

An organic compound has the following properties ; It gives a positive tri-iodomethane test; it gives a yellow ppt, with 2, 4-DNP regent; it does not react with Tollen's reagent . Which compound would give these results

• CH₃CHO A
• CH₃CH₂OH B
• CH₃CH₂COCH₃ C
• CH₃CH₂CH₂CHO D

Which compound does not show hydrogen bonding with water

• CH₃OH A
• C₂H₅OH B
• CH₃- O - CH₃ C
• C₆H₅OH D

Glycogen is stored in

• Animals A
• Plants B
• Soil C
• None of these D

Which one of the following statements of glucose and sucrose is incorrect?

• Both are soluble in water A
• Both are naturally occuring B
• Both are carbohydrates C
• Both are disaccharides 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

Ecosystem is a smaller unit of

• Hydrosphere A
• Lithosphere B
• Biosphere C
• Atmosphere D

The M.P. of carboxylic acids containing even number of carbon atoms is ______ than the next

• Higher A
• Low B
• Equal C
• None D

Which of the following is halo form

• CHBr₃ A
• CHCI₃ B
• CHI₃ C
• All of these D

The substance which increases rate of reaction but remains unchanged at the end of reaction is called :

• Catalyst. A
• Indicator. B
• Promoter. C
• Activator. D

Carboxylic acids having carboxyl group one is called:

• Mono carboxylic acid A
• Di-carboboxylic acid B
• Tri carboxilic acid C
• Tetra carboxylic acid D

Which is an inert gas?

• Nitrogen A
• Oxygen B
• Hydrogen C
• CO D

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ion in filtrate?

• Ag⁺ and NO_3- only

  A

• Ag⁺ and Ba² and NO^-3

  B

• Ba² and NO^-3

  C

• Ba² and NO^-3 and Cl-

  D

Down's cell is used to prepare:

• Sodium carbonate A
• Sodium bicarbonate B
• Sodium metal C
• Sodium hydroxide D

Which one of the following step is not involved in determination of empirical formula

• Determination % of each element A
• Determination of gram atom of each element B
• Determination of isotopes of each element C
• Determination of atomic ratio of element D

What will happen if LiAIH₄is added to an ester?

• Two units of alcohol are obtained A
• One unit of alcohol and one unit of acid is obtained B
• Two units of acids are obtained C
• None of these D

• 
  A
• 
  B
• 
  C
• 
  D

Which one of the following statement is wrong regarding differences between aldehydes and ketones

• Aldehydes undergo reduction to form primary alcohols while ketones undergo reduction to form secondary alcohols A
• Aldehydes undergo oxidation to form acids having less number of carbon atoms while ketones undergo oxidation to form acids having same number of carbon atoms B
• Aldehydes give positive silver mirror test while ketones give negative -mirror test C
• Aldehydes can undergo polymerization while ketones cannot undergo polymerizarion D

Which is the formula of tetra-ammine chloro-nitro platinum (IV) sulphate

• [Pt(NH₃)₄(NO₂)] SO₄ A
• [Pt NO₂CI(NH₃)₄] SO₄ B
• [Pt CI(NO₂) (NH₃)₄] SO₄ C
• [Pt (NH₃)₄(NO₂) CI] SO₄ D

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

• 
  A
• 
  B
• 
  C
• 
  D

Boiling point of n-butane is:

• -102°C A
• -75°C B
• -55°C C
• 55°C D

Of the following which is a step growth polymer

• Bakelite A
• Polyethylene B
• Teflon C
• PVC D

The heat of formation of graphite and P(white) is ______ KJ/mole

• 0.00 A
• -273.0 B
• +8.7 C
• 813.99 D

By reaction Grignard's reagent with the HCHO we get

• 1° - alcohol A
• 2° - alcohol B
• 3° - alcohol C
• All of these D

Transition elements form which type of bond

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

Gases shows uniform behavior toward their :

• Internal conditions A
• External conditions B
• Internal and external conditions C
• None of above D