ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

If heat absorbed in the reaction, the process is said to be

• Exothermic A
• Isothermal B
• Adiabatic C
• Endothermic D

Angle is OF₂is

• 120⁰ A
• 180⁰ B
• 105⁰ C
• 102⁰ D

• 0.073 A
• 0.147 B
• 0.05 C
• 0.026 D

2-Bromopentane is heated with potassium ethoxide in ethanol . The major product obtained is

• 2-Ethoxypentane A
• Pent-1-ene B
• cis-Pent-2-ene C
• trans-Pent-2-ene D

Sulphuric acid reacts with PCl₅to give

• Thionyl chloride A
• Sulphur monochloride B
• Sulphuryl chloride C
• Sulphur tetrachloride D

During dehydration of alcohols to alkenes by heating with conc. H₂SO₄, the initial step is

• Formation of an ester A
• Protonation of alcohol molecule B
• Formation of carbocation C
• Elimination of water D

The fibre which is made from vinylidine chloride polymer is called

• Rayon fibre A
• Azlon fibre B
• Acetate fibre C
• Saran fibre D

Which halogen has Iustrous shining?

• F₂ A
• Cl₂ B
• Br₂ C
• I₂ D

Identification of a substance, determination of its structure an quantitative analysis of its composition are the aspects covered by:

• Modern analytical physics. A
• Mechanical chemistry. B
• Biochemistry. C
• Modern analytical chemistry. D

Bone ash contains calcium phosphate

• 70% A
• 80% B
• 90% C
• 100% D

Glacial acetic acid freezes to ice like solid it.

• 07 A
• 17 B
• 27 C
• 37 D

Which one of the following has highest density

• Zn A
• Os B
• Ni C
• Cu D

The melting point is lowest for

• Be A
• Mg B
• Ca C
• Sr D

When propanamide reacts with Br₂and NaOH then which of the following compounds is formed?

• Ethyl alcohol A
• Propyl alcohol B
• Propyl amine C
• Ethylamine D

10 ml of 1.5 M NaOH solution is neutralized by 20 ml of a-M HCl solution. The value of 'a' will be

• 1.0 A
• 0.75 B
• 0.5 C
• 0.25 D

Which of all following compound is not possible

• 
  A
• 
  B
• 
  C
• 
  D

Preparation of ethylbenzene by the reaction of bromobenzene, ethylbromide and sodium is called

• Wurtz reaction A
• Fitting reaction B
• Wurtz fitting reaction C
• None of these D

Proteins and amino acid can be separated by:

• Filtration A
• ^Sublimation B
• Chromatography C
• Suction D

Radioactive element in halogens is

• Astatine A
• bromine B
• Iodine C
• Fluorine D

Boyle's law is represented as :

• P∞ 1/T

  A
• V and 1/P B
• P∞P C
• P∞1/P D

An ionic compound A+B is most likely to be formed when

• The ionization energy of A is high and electron affinity of B is low. A
• The ionization energy of A is low and electron affinity of B is high. B
• Both ionization energy of A and electron affinity of B are high. C
• Both ionization energy of A and electron affinity of B are low. D

Which of the following species is paramagnetic?

• CO₂ A
• NO B
• O^2- C
• CN D

A state function of the system which describes together the internal energy and the work done is called

• Enthaply A
• Internal energy B
• Work C
• Free energy D

Aldehydes can be distinguished from ketones by using

• Schiff's reagent A
• Conc. H₂SO₄ B
• Anhy. ZnCl₂ C
• Resorcinol D

Benzene gives reactions generally

• electrophilic A
• addition substitution B
• synthesis C
• addition and electrophilic substitution D

• Excitantion of an electron from 2s to 2p-orbital A
• Transfer of three electrons from B to the other atoms B
• Excitation of two electrons form 2s orbital to 2p orbital C
• Formation of molecular ion D

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

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

Hydrolysis of an ester gives a carboxylic acid which on Kolbe's electrolysis yields ethane. the easter is

• Ethyl methonoate A
• Methyl ethanoate B
• Propylamine C
• Ethylamine D

When potassium metal is exposed to violet light

• Ejection of electrons takes place A
• Ejection of some potassium atoms occurs B
• There is no effect C
• The absorption of electrons takes place D

The widely used nitrogen fertilizer that contains about 46% nitrogen is

• Ammonia A
• Ammonium nitrate B
• Ammonium sulphate C
• Urea D