ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which of the following decolorized Br₂-water

• Methane A
• Ethane B
• Ethene C
• Propane D

A substance which increases the rate of a reaction without being consumed during the reaction is called

• An autocatalyst A
• A catalyst B
• A negative catalyst C
• All of these D

Which of the following statements is not true?

• Isotopes with even atomic masses are comparatively abundant A
• Isotopes with even atomic masses are comparatively abundant B
• Isotopes with even atomic masses and even atomic numbers are comparatively abundant C
• Isotopes with even atomic masses and odd atomic number are comparatively abundant D

After chlorination, the pulp is washed at:

• 20°C A
• 30°C B
• 40°C C
• 60°C D

Enzymes are

• Proteins A
• Minerals B
• Oils C
• Fatty acids D

Which one gives acidic reactions?

• CH₃----C≡C-------CH₃ A
• CH₃-----CH₂-----HC=CH----CH₂ B
• CH₃----CH=CH₂ C
• CH₃-----C≡CH D

Which property is not present in Al?

• Reacts with acid A
• Reacts with bases B
• Changes litmus paper C
• Changes methyle orange colour D

In the hydrolysis of CH₃COOC₂H₅the acid produced is

• Inhibitor A
• Catalyst B
• Auto catalyst C
• None of above D

The 95.5% mass of Lithosphone is made of 11 elements i.e. O₂, Si, Al, Fe, Ca, Na, K, Mg, Ti, H₂and P. which element is present in trace amount

• Iodine A
• Bromine B
• Lead C
• Carbon D

The less reactivity of transition metal is due to

• High heats of sublimation A
• High ionization energies B
• Low heats of salvation C
• All these D

The bond order of individual C - C bond is benzene is

• One A
• Two B
• Between one and two C
• One and two alternately D

The rate of reaction :

• Decreases as the reaction proceeds A
• Increases as the reaction proceeds B
• May decrease or increase reaction proceeds C
• Remains same as the reaction proceeds D

Purification of an impure copper is made by electrolytic cell, in which impure copper is anode and pure copper is cathode, and the electrolyte used is

• H₂SO₄ A
• CuSO₄ B
• ZnSO₄ C
• Na₂SO₄ 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 one of the following compounds does not have the empirical formula CH₂O?

• Ethanoic acid, CH₃CO₂H A
• Ethanol, CH₃CH₂OH B
• Glucose, C₆H₁₂O₆ C
• Methanal, HCHO D

The general formula of alkane is

• C_nH_2n+2 A
• C_nH_n B
• C_nH_2n C
• C₂H_2n-1 D

Chemical reactivity of elements depends upon their characteristic:

• Shape. A
• Color. B
• Electronic configuration. C
• Sizes D

Element with higher oxidation state form oxides:

• Acidic A
• Basic B
• Ampholetic C
• Peroxides D

Which is a good nucleophile?

• F^-1 A
• Cl^-1 B
• Be^-1 C
• I^-1 D

• Initial concentration of acetic acid A
• Initial concentration of ethyl acetate B
• Equilibrium concentration of acetic acid C
• Equilibrium concentration of ethyl acetate D

The silver bromide in hypo (Na₂S₂O_{3) solution is}

• Soluble A
• Not soluble B
• Precipitated C
• Not effect D

For which system does the equilibrium constant, KC has units of concentration

• 
  A
• 
  B
• 
  C
• 
  D

When fused PbBr₂is electrolyed then

• Bromine appears at cathode A
• Lead deposited at the cathode B
• Lead appears at the anode C
• None of these happens D

Colour of fluorine gas is

• Pale yellow A
• Greenish yellow B
• Red brown C
• greyish black D

95% ethanol is called :

• Rectified ether. A
• Diesel. B
• Rectified spirit. C
• Petrol. D

18 g glucose is dissolved in 90 g of water. The relative lowering vapor pressure is equal to :

• 1/5 A
• 5.1 B
• 1/51 C
• 6 D

The method in which alkanes prepared by alkyle halides in the presence of palladium - charcoal is

• Hydrolysis A
• Electrolysis B
• Hydrogenation C
• Hydrogenolysis D

Which of the following equations represents the action of heat on NaHCO₃

• 
  A
• 
  B
• 
  C
• 
  D

The density of a gas is directly and volume at constant temperature for a gas is

• Isobaric A
• Isothermal B
• Isotherm C
• None of above D

The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb is

• Mg < K < Na < Rb A
• Mg < Na < K < Rb B
• Mg < Na < Rb < K C
• Na < K < Rb < Mg D