ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The temperature in the incineration process has a range:

• 900°Cto 1000°C A
• 650 to 1100°C B
• 950°C to 1300°C C
• 500°C to 900°C D

Which of the following compounds will not give iodoform test on treatment with I₂/ NaOH?

• Acetaldehyde A
• Acetone B
• Butane C
• 3-pentanone D

When chlorofluoro carbon are subjected to U.V. they form

• Cations A
• Anions B
• Free radicals C
• None of these D

The cell in which a non-spontaneous redox reaction takes place as a result electricity is known as :

• Electrolytic cell. A
• Voltaic cell. B
• Daniel cell. C
• Dry cell. D

Pickle when placed in the path of current.

• Will conduct current A
• Will not conduct current B
• Will become unfit to eat C
• None of the above D

Phosphorus helps the growth of :

• Root A
• Leave B
• Stem C
• Seed D

Which is not a calcarious material

• lime A
• clay B
• marble C
• marine shell D

Which is laughing gas?

• NO A
• N₂O B
• NO₂ C
• NO₃ D

When a carbon atom forms single bonds with other carbon atoms, these hybrid orbitals overlap with the orbitals of hydrogen to form four bonds which are

• Three sigma and one P_i A
• Two sigma and two P_i B
• One sigma and three P_i C
• sigma D

Alkyl halides on treatment with aqueous KOH give

• Phenol A
• Alcohol B
• Aldehyde C
• Ketone D

When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as

• Paschen A
• Pfund B
• Balmer C
• Brackett 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

Etherification is catalyzed by

• Acids A
• Gases B
• Salts C
• None of the these D

Group VA of the periodic table consists of the elements N, P, As, Sb and Bi, On passing from N to Bi, the oxides of the elements of general formula M₂O₃become

• Stronger reducing agents A
• More ionic B
• More basic C
• More volatile D

• Aqueous bromine A
• Dilute HNO₃ B
• Dilute HCI C
• CH₃COCI D

The alkyl halide is converted into an alcohol by

• Addition A
• Substitution B
• Dehydrohalogenation C
• Elimination D

Which of the following will have the same number of molecules at STP ?

• 280 CM³ of CO² and 280 CM³ of N₂O

  A

• 11.2 dm3 of O₂ and 32 g of O₂

  B

• 44 g of CO₂ and 11.2 dm³ of CO

  C

• 28 g of N2 and 5.6 dm³ of oxygen

  D

Corrosion may be prevented by

• Allcying A
• Paints B
• Metallic coatings C
• All D

Most metals are conductors of electricity because of the :

• Light weight. A
• Immobility of the electrons. B
• Lustrous surfaces C
• Relatively free movement of their electrons D

When two hydrogen atoms approach to form a chemical bond

• The repulsive forces dominate the attractive forces A
• The attractive forces, dominate the repulsive forces B
• The energy of atoms increases C
• The two atoms start ionization D

With the increase in size of halogen atom the reactivity of an alkyl halide

• Increases A
• Decreases B
• Remain constant C
• None of these D

Which causes water pollution?

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

When aluminium electrode is coupled with copper electrode in a galvanic cell :

• Reduction takes place at aluminium electrode. A
• Oxidation takes place at copper electrode. B
• Reduction takes place at copper electrode. C
• Both (a) and (c) D

Al³⁺is a symbol for aluminium

• Atom A
• Ion B
• Cation C
• Anion D

The inter-molecular forces in liquids are:

• Negligible A
• Very weak B
• Very strong C
• Reasonably strong 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

Which fills the space between needles in cement setting?

• Ca(OH)₂ A
• Al(OH)₃ B
• CaCO₃ C
• MgSO₄ D

Which technique is used to determine the absorption of radiations?

• Dilatometer method

  A

• Optical rotation method

  B

• Spectrometry

  C

• Refractometric method

  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 empirical formula of a compound is CH₂O. What may be the compound

• C₂H₅OH A
• C₆H₅OH B
• HCOOH C
• 
  D