ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

• Electronphilic substitution A
• Electrophilic addition B
• Free radical substitution C
• Nuclephilic substitution D

When phenol is reduced in the presence of Zn dust, we get

• Cyclohexene A
• Cyclohexane B
• Benzene C
• Benzyne D

At sea level and at 100⁰C the vapour pressure of water in an open system is

• 1000 mm Hg A
• 760 mm Hg B
• 730 mm Hg C
• 670 mm Hg D

In electrolysis of NaCl when Pt electrode is taken then H₂is liberated at cathode while with Hg cathode it forms sodium amalgam

• Hg is more inert than Pt A
• More voltage is required to deduce H⁺at Hg than Pt B
• Na is dissolved in Hg while it does not dissolve in Pt C
• Conc. of H⁺ions is larger when Pt electrode is taken D

The spectrum of helium is expected to be similar to that of

• H A
• Li⁺ B
• Na C
• He⁺ D

How does the ionization energy of 1st group elements vary?

• Increases down the group A
• Decreases down the group B
• Remains unchanged C
• Variation is not regular D

Alcohols are named by replacing 'e' of alkane with:

• al A
• ene B
• ol C
• one D

Smallest charge of electricity that has been measured so far is

• Charge on a-rays A
• Charge on electron (1.602 x 10^-19C) B
• Charge on x-rays C
• Charge on gamma rays D

Which one of the following is not related to spontaneous process.

• Unidirectional.

  A
• Real. B

• Irreversible.

  C
• Artificial. D

Gypsom added in cement is:

• 1% A
• 2% B
• 3% C
• 4% D

Vegetables oils are:

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

The rigid rocket part of earth crust called lithosphere extends upto a depth of:

• 10 km A
• 100 km B
• 1000 km C
• 1500 km D

The number of atoms or molecules whose concentrations determine the rate of the reaction is called

• Molecularity A
• Order B
• Rate of reaction C
• Rate constant D

The percentage of methane in natural gas is

• 50% A
• 60% B
• 85% C
• 90% D

Alkyl halides are reactive :

• High A
• Medium B
• Less C
• Least D

A balloon contains 0.02 gram of H₂gas, it contains H₂molecules

• 6.02 x 10²³ A
• 3.01 x 10²² B
• 6.02 x 10²¹ C
• 3.01 x 10²¹ D

An oil or fat with no double bond have iodine number:

• Zero A
• 100% B
• 50% C
• minimum D

Benzene acid can be prepared from the oxidation of:

• benzene A
• ethyl benzene B
• benzonic acid C
• toluene D

When vapours of isopropyl alcohol are passed over heated copper, the major product obtained is

• Propane A
• Propylene B
• Acetaldehyde C
• Acetone D

What is the name of the comlex [Ni(CO)₄]

• Tetracarbonylnickel (o) A
• Tetracabonylnickel B
• Tetracabonylnickel (II) C
• Tetracabonylnickel (IV) D

Heat of neutralization of weak acid and a strong base is

• 13.7 Kcal A
• Less than 13.7 Kcal B
• Greater than 13.7 Kcal C
• None of these D

The statement that the properties of every eight elements are similar to the first is the law of

• Dobereiner A
• Newland B
• Mendeleev C
• L. Meyer D

Red P can be obtained form white P by

• Heating it with a catalyst in an inert atmosphere A
• Distilling it in an inert atmosphere B
• Dissolving it in CS₂and crysllizing C
• Melting it ad pouring the liquid into water D

Indicate the correct statement

• All lanthanidees are present in the same group A
• All halogens are present in the same period B
• All the alkali metals are present in the same group C
• All the noble gases are present int he same period D

• 0.60 A
• 1.67 B
• 0.66 C
• 2.6 D

At present oil refineries in Pakistan are:

• One A
• Two B
• Three C
• Four D

The movement of molecules from a region of high pressure to vacuum is called :

• Evaporation A
• Effusion B
• Conduction C
• Difusion D

Which is a component of micro nutrient?

• N A
• Zn B
• P C
• K D

Phenol is a weak acid. The correct order of acid strength of carboxylic acid, phenol and alcohol is

• Carboxylic acid > phenol > alcohol A
• Carboxylic acid > alcohol > phenol B
• Phenol > carboxylic acid > alcohol C
• Alcohol > phenol > carboxylic acid D

(CH₂O)_nis general formula for

• Monosaccharides A
• Oiligosaccharides B
• Polysaccharides C
• None of these D