ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

The optimum conditions of temperature and pressure to get maximum NH₃form N₂and H₂gases is

• 2000°C and 10 atmosphere A
• 0°C and 1 atmosphere B
• 400°C and 200-300 atmosphere C
• 200°C and 100 atmosphere D

• Small change in concentration of product A
• Small time internal B
• Co-efficient of the reactant C
• Co-efficient of the product D

A solution has 92 g of ethyl alcohol, 96 g of methyl alcohol and 90 g of water. Mole percentage of ethyl alcohol in the solution is

• 10 A
• 20 B
• 25 C
• 50 D

B-atom in BF₃has

• sp³hybridization A
• sp²hybridization B
• sp hybridization C
• no hybridization D

Each of the following is true of white and red phosphours except that they

• Are both soluble in CS₂ A
• Can be oxidized by heating in air B
• Consist of the same kind of atoms C
• Can be converted into one another D

An aqueous solution is neutral when its

• pH = 14 A
• pH = zero B
• pH = 7 C
• Kw = 10^-7 D

By applying Hess's law, we can calculate

• ΔH A
• ΔS B
• ΔF C
• K D

Cooling happens under the Joule Thomson Effect due to sudden

• Contraction A
• Absorption B
• Expansion C
• All of above D

The fibre which contains polymers of vinylidine chloride as fibre forming substance is known as

• Saran fibre A
• Nylon B
• Polyester C
• Acetate fibre D

The value of charge on electron is

• 1.602 x 10^-19coulombs A
• 1.602 x 10^-18coulombs B
• 1.602 x 10^-17coulombs C
• 1.602 x 10^-16 coulombs D

• 0 A
• 1 B
• 2 C
• 3 D

Isopropyl alcohol on oxidation gives

• Acetone A
• Ether B
• Ethylene C
• Acetaldehyde D

Grignad reagent is reactive due to

• The presence of halogen atom A
• The presence of Mg atom B
• The polarity of C - Mg bond C
• None of above D

If an electrophile attacks then ______ bond breaks first

• C - H A
• O - H B
• C - O C
• None of these D

Hydrocarbon molecule with large chain lengths experience:

• Weaker attractive forces A
• Stronger attractive forces B
• Repulsive forces C
• No attractive forces D

Which one of the following is a water soluble vitamin

• Niacin A
• Riboflavin B
• Tyrosine C
• Ascorbic acid D

Linear shape is associated with which set of hybrid orbitals

• sp A
• sp² B
• sp³ C
• dsp² D

The bond angle between hydrogen atoms and carbon in alkane is

• 104.5° A
• 107.5° B
• 109.5° C
• 120.5° D

Reaction takes place at anode is

• Ionization A
• Reduction B
• Oxidation C
• Hydrolysis D

Chemistry related to the study of environment affected by the chemicals and pollutants is called:

• Biochemistry A
• Physical chemistry B
• Pharmaceutical chemistry C
• Environmental chemistry D

The total number of inner transition elements in the periodic table is

• 10 A
• 14 B
• 28 C
• 30 D

The subject matter of first law of thermochemistry is based on:

• First law of Themochemistry. A
• First law of Thermodynamics. B
• Second law of Themochemistry. C
• Second law of Thermodynamics. D

The acid showing salt like character in aqueous solution is

• Acetic acid A
• Benzoic acid B
• Formic acid C
• α - Aminoacetic acid D

The metal present in blood is

• Al A
• Hg B
• Cu C
• Fe D

One of the followings is not type of polymer

• Homopolymer A
• Copolymer B
• Heteropolymer C
• Terpolymer D

The human body can synthesize ______ amino acids

• 1 A
• 10 B
• 20 C
• 19 D

Glacial acetic acid freezes to ice like solid at (°C)

• 07 A
• 17 B
• 27 C
• 37 D

Which of the following molecules have multiple bonds

• CH₄ A
• C₂H₄ B
• C₂H₆ C
• CCI₄ D

Calcium acetate when dry distilled gives

• Formaldehyde A
• Acetaldehyde B
• Acetone C
• Acetic anhydride D

Ethyl alcohol is industrially prepared from ethylene by

• permanganate oxidation A
• Catalytic reduction B
• Absorbing in H₂SO₄followed by hydrolysis C
• Fermentation D