ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Vital force theory was rejected by

• Berzellius A
• Kolbe B
• Wholer C
• Lavoiser D

For which system does the equilibrium constant, kc has units of (concentration) ?

• N₂+3H_2-------2NH₃

  A

• H₂+L₂---------2HL

  B

• 2NO₂----------N₂O₄

  C

• 2HF--------H2+F₂

  D

Activity of the enzyme is reduced by

• Temperature A
• Concentration B
• pH C
• Inhibitors D

Most transition elements show

• Diamagnetic behavior A
• Ferromagnetic behavior B
• Paramagnetic behavior C
• None of these D

Heating a mixture of sodium benzoate and soda lime gives

• Methane A
• Benzene B
• Sodium bezoate C
• Calcium benzoate D

The hydrocarbon used for polymerization is

• Alkanes A
• Alkenes B
• Alkynes C
• All of above D

Tetrabromoethane on treatment with alcoholic zinc gives

• Ethylbromide A
• Ethane B
• Ethene C
• Ethyne D

Vegetable oils are

• Unsaturated fatty acids A
• Glycerides of unsaturated fatty acids B
• Glyccerides of saturated fatty acids C
• Essential oils obtained from plants D

The rate of diffusion of a gas in

• Inversely proportional to its density A
• Inversely proportional to square root of its molecular mass B
• Directly proportional to molecular mass C
• Directly proportional to its density D

Fe⁺³and Mn²⁺are strong paramagnetic because the number of unpaired electrons in each is

• 4 A
• 5 B
• 6 C
• 7 D

The real or imaginary surface separating the system from the surrounding is called

• Imaginary line A
• Boundary B
• Real line C
• All of above D

pH and pKa of the buffer are related by Henderson equation which is

• 
  A
• 
  B
• 
  C
• 
  D

Chemical equilibrium involving reactants and products in more than one phase is called

• Static A
• Dynamic B
• Homogeneous C
• Heterogeneous D

For a given process the heat change at constant pressure q_pis related to the heat change at constant volume (q_v) according to

• q_p= q_v A
• q_p< q_v B
• q_p> q_v C
• q_p= qv/2 D

Newland's was scientist:

• Russian A
• German B
• English C
• French D

The covalent radius of Cl atom is:

• 99.4 pm. A
• 176.7 pm B
• 38 pm C
• 76 pm. D

Compounds containing cyanide group (.........C=H) are called:

• Nitrides A
• Nitrites B
• Nitriles C
• Cyanides D

Which element does not belong to 4d series

• Y A
• Zr B
• Mo C
• Zn D

All covalent bonds formed between the two atoms are non-polar when

• Covalent bond between two non-metal atoms A
• Covalent bond between metal and non-metal B
• Covalent bond between two atoms of same element C
• Covalent bond between metal atoms D

Which of the following is not affected by light

• 
  A
• 
  B
• 
  C
• 
  D

Which one is the most toxic?

• Carbon A
• CO B
• CO₂ C
• SO₂ D

Reaction of HNO, with very dilute Zinc and at low temperature gives

• H₂ A
• NO B
• NO₂ C
• NH₄ D

Vegetables oil are:

• Unsaturated fatty acids A
• Glycerides of saturated fatty acids B
• Essential oils obtained from plants C
• None of these D

Saturated solution of NaCl on heating becomes

• Super saturated A
• Unsaturated B
• Remains saturated C
• None D

• Acidic amino acid A
• Basic amino acid B
• Neutral amino acid C
• None of these D

Which of the following is a noble gas:

• Ne. A
• Cl₂. B
• H₂. C
• N₂. D

An oxidixing agent

• K₂Cr₂O₇ A
• H₂SO₄ B
• FeSO₄ C
• K₂SO₄ D

Which is used in arc welding and cutting?

• He A
• Ne B
• Ar C
• Kr D

Which among the following elements have lowest value of IE₁?

• Pb A
• Sn B
• Si C
• C D

Which gasses are produced from landfills

• NH₃ A
• H₂S B
• N₂ C
• All of these D