ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The strength of economy of a country is measured with respect to production of

• Medicines A
• Cement B
• Fertilizers C
• Paper D

Ifk_cof a reaction productis verylarge, it indicates that equilibrium occurs :

• With the help of a catalyst. A
• With no forward reaction. B
• At a low product concentration. C
• At a high product concentration. D

Which is used in arc welding and cutting?

• He A
• Ne B
• Ar C
• Kr D

Enzymes are catalysts which contain other than carbon and hydrogen one other element

• Oxygen A
• Sulphur B
• Phosphorus C
• Iodine D

When methane reacts with Cl₂in the presence of diffused light the products obtained are

• Chloroform only A
• Carbon tetrachloride only B
• Chloromethane and dichloromethane C
• Mixture of a, b, c D

Reduction of alkyl halides give

• Alkanes A
• Alkenes B
• Ketones C
• Ether D

The melting point is lowest for

• Be A
• Mg B
• Ca C
• Sr D

The general formula for alkenes is

• C_nH_2n+1 A
• C_nH_2n+2 B
• C_nH_2n C
• C_nH_2n-2 D

Which of the following decolorized Br₂-water

• Methane A
• Ethane B
• Ethene C
• Propane 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

Phosphine is not obtained by the reaction when

• White P is heated with NaOH A
• Red P is heated with NaOH B
• Ca₂P₂reacts with water C
• PH₄l is boiled with water D

Hydrolysis of Grignard's reagent gives:

• Alcohol A
• Halide B
• Alkyl C
• Alkane D

The positive ion is always smaller than the neutral atom while the negative ion is always bigger than the neutral atom. The atomic and ionic radii of Na, F, Na⁺, F^-are in ppm

• Na F Na⁺ F^-
  157 72 95 136
  A
• Na F Na⁺ F^-
  157 95 172 136
  B
• Na F Na⁺ F^-
  72 95 136 157
  C
• Na F Na⁺ F^-
  157 136 95 72
  D

Quantity of heat evolved or absorbed during the reaction is measured according to the equation

• 
  A
• 
  B
• 
  C
• 
  D

When acetic acid and ethanol react together an ester is formed which is called

• Ethyl ester A
• Ethanoic acid B
• Ethanoic acid C
• Ethyl acetate D

The boiling points of alcohols are higher than the corresponding alkanes, This is because

• Of hydrogen bonding existing between molecules of alcohols A
• Alkanes are dipolar compounds B
• Alcohols are sweet in taste C
• Alcohols are soluble in water D

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

96500 C of electricity liberates from CuSO₄solution

• 63.5 g of Cu A
• 31.75 g of Cu B
• 96500 g of Cu C
• 100 g of Cu D

Which one is used as a fuel for internal combustion engines in many European countries and Brazil

• C₂H₅OH A
• CH₃OH B
• CH₃COOH C
• C₂H₂ D

Elimination bimolecular reactions involve:

• First order Kinetics A
• Third order kinetics B
• Zero order kinetics C

Which of the following has highest bond order

• 
  A
• 
  B
• 
  C
• 
  D

Which bond is most stable

• C - Cl A
• C - F B
• C - Br C
• C - I D

Solvay process is used in the manufacture of

• Na₂CO₃ A
• NaHCO₃ B
• CaCl₂ C
• All D

During the preparation of alkynes the active metals that react with tetra halo-alkanes are

• Zn A
• Mg B
• Both a and b C
• None D

Each molecule of haemoglobin is 68000 times heavier than one atom of

• C A
• H B
• N C
• O D

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBh₄or LiAH₄?

• 1-Propanol A
• 2-Propanol B
• 2-Methyl2-Proponal C
• Ethanol D

Monocarboxylic acids exist as dimer because of

• Dipole-dipole attraction A
• Hydrogen bonding B
• Van der Waals forces C
• Conhesive forces D

Tincal is a mineral of:

• Al A
• B B
• Si C
• C D

Two or more similar monomers combine to form:

• Homopolymer A
• Copolymer B
• Ter polymer C
• Thermoplastic polymers D