ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

Which of the following is used as disinfectant

• K₂Cr₂O₇ A
• KMnO₄ B
• K₂MnO₄ C
• K₂CrO₄ D

The reaction of sodium with ethanol gives

• CH₃OH A
• NaH B
• H₂O C
• H₂ D

The reaction between fat and NaOH is called:

• Esterification A
• Hydrogenolysis B
• Fermentation C
• Sponification D

The three N - Hσ-bonds are made by

• sp³- s overlap A
• sp²- s overlap B
• P - p overlap C
• sp - overlap D

Major component in cement is :

• SiO₂ A
• Lime B
• Al₂O₃ C
• MgO D

Vitamin A is present in

• Liver A
• Milk B
• Green vegetables C
• All D

All are ortho & Para directing except

• X A
• OH B
• NR₃ C
• NH₂ D

Tryosine was isolated from

• Butter A
• Cheese B
• Oils C
• Fats D

Benzene reacts with chlorine to form benzene hexachloride in presence of

• Nickel A
• AlCl₃ B
• Bright sunlight C
• Zinc D

Alkanes or paraffin's are made up of.

• Carbon, hydrogen and oxygen only A
• Carbon, hydrogen and Magnesium only B
• Carbon, hydrogen and nitrogen only C
• Carbon and hydrogen only D

Colour of bromine is

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

A gas bulb is filled with NO₂gas and immersed in an ice bath at 0°C which becomes colourless after sometimes. This colourless gas will be

• NO₂ A
• N₂O B
• N₂O₄ C
• N₂O₅ D

Charge on electron was discovered by:

• Millikan. A
• Crook. B
• Neil Bohr. C
• Rutherford. D

Odour of alkene is:

• Fruity A
• Odourless B
• Zarlic like C
• Irritating D

[Ti(H₂O)₆]⁺³ion absorbs colour:

• Blue A
• Yellow B
• Green C
• Red D

The oxidation state of Fe in [Fe(CN)₆]^3-is

• +2 A
• +3 B
• +4 C
• -3 D

No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is

• Voltage is low A
• Discharge tube is not coloured B
• Gas does not conduct current under ordinary pressure C
• Temperature low D

Formaldehyde is used to make

• Plastics A
• Medicine B
• Antiseptic C
• All of these D

1-Chlorobutane on reaction with alcoholic potash gives

• But 1-ene A
• Butan-1-ol B
• But-2-ene C
• Butan-2-ol D

Steps in SN , reactions are:

• One A
• Two B
• Three C
• Four D

Carbon monoxide, emitted by automobiles, prevents transport of oxygen in body due

• Combining with oxygen to form carbon dioxide A
• Destruction of hemoglobin B
• Preventing reaction between oxygen and hemoglobin C
• Forming stable compound with hemoglobin D

Which of the following element is most reactive

• Li A
• Na B
• K C
• Cs D

The graph between pressure and volume at constant temperature for a gas is

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

• s A
• p B
• d C
• f D

• KC = KP A
• Kp = KcRT B
• Kp = kc(RT)^-2 C
• Kp = Kc(RT)^-1 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

What happens when reaction is at equilibrium and more reactant is added :

• Forward reaction rate is increased. A
• Forward reaction rate is decreased. B
• Backward reaction rate is increased. C
• Equilibrium remains unchanged. D

• Cu A
• H B
• N C
• O D

Force of attraction between atoms of He is

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

The statement regarding effect of catalyst on reversible reaction is.

• To increase equilibrium constant for forward reaction A
• To increase yield of product in equilibrium B
• To increase the rate constant for both reactions C
• To increase the rate of only for ward reaction D