ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

In carboxyl group the bond between C and oxygen is:

• Sigma bond A
• Single bond B
• Double Bond C
• Triple bond D

Bessemer converter is used in the manufacture of

• Pig iron A
• Steel B
• Wrought iron C
• Cast iron D

2SO₂+ O₂⇌2SO₂H= 188KJ mole^-1

Which statement about following equilibrium is correct :

• The value ofK_pfalls with arise in temperature.

  A

• The value ofK_pis equal tok_c.

  B

• The value ofK_pfalls with the increase pressure.

  C

• Adding V₂O₅catalyst increase the equilibrium yield of Sulphur trioxide.

  D

When a nitrogeneous base combine with a sugar it is called

• Ribose A
• Nucleotides B
• Nucleoside C
• None D

The substances which soften the polymer are called

• Stabilizers A
• Plasticizers B
• Retarders C
• Pigments D

By using graphite electrode the electrolysis of aqueous solution of NaCI produces at anode

• H₂gas A
• Cl₂gas B
• NaOH C
• No metal D

Benzene reacts with chlorine to form benzene hexachloride in presence of

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

Simple sugars are :

• Monosacchrides A
• Disaccharides B
• Oligo saccharides C
• Trisaccharides D

Number of elements in the first period of the periodic table are

• Two A
• Four B
• One C
• Eight D

If pH of buffer of 1 mole dm^-3of HCOOH + 0.1 mole dm^-3HCOONa having pKa = 3.78 is

• 1.78 A
• 2.78 B
• 3.78 C
• 4.78 D

• Hear of reaction A
• Heat of formation B
• Heat of neutralization C
• Heat of combustion D

The temp. used for the hydrogenation of alkenes using Ni is

• 2000°C A
• 400°C B
• 200-- 300°C C
• 1000°C D

• Initial concentration of reaction A
• Initial concentration of products B
• Final concentration of products C
• Order of the reaction D

SO₂is not absorbed in water directly to or H₂SO₄because:

• The reaction does not go to completion A
• the reaction is quite slow B
• the reaction is exothemic C
• SO₃is insolublein water D

Which of the following ion has the highest value of ionic radius?

• Li⁺ A
• F^- B
• O^2- C
• B³⁺ D

Cannizzaro's reaction in not given by

• Formaldehyde A
• Acetaldehyde B
• Benzaldyhyde C
• Trimethylacetaldehyde D

• Zero A
• 1 B
• 2 C
• 1.5 D

Water pollution is mainly due to

• Sulphure dioxide A
• Carbon dioxide B
• Oxygen C
• Industrial discharges D

DNA is a polynucleic acid. The monomer is known as a nucleotide. What is not the component of the nucleoptide

• Phosphate group A
• Deoxy ribose sugar B
• Uracil base C
• Adenine base D

High purity copper metal is obtained by

• Carbon reduction A
• Hydrogen reduction B
• Electrolytic reduction C
• Thermite reduction D

• Equal volumes of N₂and H₂are reacting A
• Equal masses of N₂and H₂are reacting B
• The reaction has stopped C
• The same amount of ammonia is formed as is decomposed into N₂and H₂ D

Acid rain is due to increase in atmospheric concentration of

• Ozone and dust A
• CO₂and CO B
• SO₃and CO C
• SO₂and NO₂ D

Which of the following is directly related with entropy

• Pressure A
• Degree of freedom B
• Temperature C
• Both b and c D

Identify the compound formed, when ethylene combines with water in the presence of 10% sulphuric acid and HgSO₄as catalyst

• Carbinol A
• Methanol B
• Ethanol C
• Glycol D

Which represents nucleophilic aromatic substitution reaction?

• Reaction of benzene with Cl₂in sunlight A
• Benzyl bromide hydrolysis with water B
• Reaction of NaOH with dintrofluoro benzene C
• Sulphonation of benzene 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

The number of elements in the 4th periods of periodic table is

• 8 A
• 10 B
• 18 C
• 32 D

In a group on going downward, polarizability generally

• Decreases A
• Increases B
• Remains constant C
• Negligible D

The measurement of degree of disorder is

• Internal energy A
• Enthalpy B
• Entropy C
• None D

Which of the following is not a fatty acid

• Propanoic acid A
• Acetic acid B
• Phthalic acid C
• Butanoic acid D