ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The valence shell of hydrogen is half filled like those of

• IV - A A
• VIA B
• V - A C
• VIIA D

Allotropic forms of oxygen Te, Se are

• Two A
• Three B
• Four C
• Five D

• Decrease in temperature favour more dissolution of the salt A
• Increase in temperature favour more dissolution of the salt B
• Lowering pressure favour more dissolution of the salt C
• Increasing pressure favour more dissolution of the salt D

Benzene is obtained by fractional distillation of

• Heavy oil A
• Anthracene oil B
• Middle oil C
• Light oil D

Which of the following species is paramagnetic?

• CO₂ A
• NO B
• O^2- C
• CN D

Force of attraction b/w atoms of He is :

• London dispersion forces A
• Hydrogen bonding B
• Coordinate covalent bond C
• Covalent bond D

When ammonia is heated with cupric oxide, a molecule of ammonia will

• Gain 3 electrons A
• Lose 3 electrons B
• Gain 2 electrons C
• Lose 2 electrons D

In an exothermic reaction, a 10° rise in temperature will

• Decrease the value of equilibrium constant A
• Double the value of K_c B
• Not produce any change in K_c C
• Produce some increase in K_c D

Classical smog occurs in palces of

• Excess SO₂ A
• Low temperature B
• High temperature C
• Excess NH₃ D

Absolute alcohol is obtained by adding rectified apirit in alcohol:

• Water A
• Na₂CO₃ B
• NaOH C
• CaO D

A single benzene ring can have ______ ortho position maximally

• One A
• Two B
• Three C
• Four D

In exothermic reversible reaction increase in temperature shift the equilibrium to :

• Remains unchanged. A
• Product side. B
• Reactant side. C
• None of above. D

The formula of ketone is

• 
  A
• 
  B
• 
  C
• None of these D

Functional group of ketones is:

• ---CHO A
• ---CO--- B
• ---C≡ N C
• ---COOH D

Which of the following is not an ortho-para directing group

• 
  A
• 
  B
• 
  C
• 
  D

In Antarctica ozone depletion is due to the formation of following compound

• Acrolein A
• Peroxy acetyl nitrate B
• SO₂and SO₃ C
• Chlorine nitrate D

The number of unpaired electrons in ferrous ion ( Z - 26) is

• 3 A
• 2 B
• 4 C
• 5 D

Polymer formation from monomers starts by

• Condensation reaction between monomers A
• Coordination reaction between monomers B
• Conversion of monomer to monomer ions by protons C
• Hydrolysis of monomers D

The oxides of which of the following elements will be acidic in character

• Mg A
• Rb B
• Li C
• Cl D

Debye forces are present in on of the following pairs:

• Na+ion and water A
• Argon and water B
• Argon and Na+ion C
• Ne and water D

Identify the compound formed, when ethylene combines with water in the presence of 10% sulphuric acid and HgSO₄as catalyst

• Carbinol A
• Methanol B
• Ethanol C
• Glycol D

In which type of following solutions we don't know the total volume of the solutions :

• Percentage weight/weight A
• Percentage weight/volume B
• Percentage volume/volume C
• Percentage volume/weight D

• HF is stable and does not decompose even at 2000°C A
• HF is stable and slowly decomposes at 2000°C B
• HF is strong acid C
• HF produces equal moles of hydrogen and fluorine D

The region of earth capable of supporting life is

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

• Electrophilic substitution A
• Free radical reduction B
• Isomerisation C
• Nucleophilic substitution D

The development of industries was a direct result of which major factor

• Population A
• Living standards B
• Depletion of resources C
• All of these D

Cyanohydrin of which of the following forms lactic acid

• HCHO A
• CH₃COCH₃ B
• CH₃CHO C
• CH₃CH₂CH₂CHO D

When no work is done by the system

• The volume of system decreases A
• The volume of system increases B
• The volume of system does not change C
• None of above D

Objects of the size of an atom can be observed in

• An electron microscope A
• An x-ray spectrum B
• Atomic absorption spectrum C
• A visible spectrum D

The rate of forward reaction is two times that of the reverse reaction at a given temperature and identical concentration, K equilibrium is

• 0.5 A
• 1.5 B
• 2.5 C
• 2.0 D