ECAT Pre Engineering MCQ Test With Answer for Chemistry Full Book

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 relative abundance of Pb isotopes is 1.5% Pb²⁰⁴, 23.6% Pb²⁰⁶, 22.6% Pb²⁰⁷, 52.3% Pb²⁰⁸The relative atomic mass of Pb is

• 207.94 A
• 208.24 B
• 206.94 C
• 207.24 D

The number of elements in the first, second and third period are

• 2, 8, 18 A
• 8, 2, 18 B
• 2, 18, 8 C
• 2, 8, 8 D

The equation of the rate of forward reaction is.

• Kf A
• Kf(C)(D) B
• Kr(A)(B) C
• Kr(A)(B) / Kf(C)(D) D

• Increases A
• Decreases B
• Remains same C
• Cannot be predicted D

The rate of a chemical reaction is directly;y proportional to product of molar concentration of reaction substance it is called :

• Low of conservation of energy. A
• Law of mass action. B
• Rate law . C
• Active mass rule. D

What is the cause of water pollution

• Chemical and bacterial contents in live stock A
• The spilled oil in rivers and ponds B
• Wide spread use of pesticides C
• All of the above D

What will react differently with the two isomeric pentols, (CH₃)₃CCH₂OH and (CH₃)₂CH CH₂CH₂OH

• Acidified (aq) KMnO₄ A
• Concentrated H₂SO₄ B
• PCl C
• Sodium D

Carboxylic acids functional group is:

• ----COOH A
• ----CO--- B
• ----OH C
• -----COH D

The nitration of benzene takes place when it is heated with a mixture of conc.HNO₃and conc. H₂SO₄at 50°C in ratio of

• 1 : 2 A
• 1 : 1 B
• 1 : 3 C
• 2 : 1 D

Which element should have the greatest value for electronegativity when combined with hydrogen

• Na A
• Si B
• S C
• Cl D

Benzene cannot undergo

• substitution reactions A
• addition reactions B
• oxidation reactions C
• elimination reactions D

Which is laughing gas?

• NO A
• N₂O B
• NO₂ C
• NO₃ D

A solution of glucose is of methanol in water has vapor pressure :

• Equal that of water. A
• Equal to that of methanol. B
• More than that of water. C
• Less than that f water. D

The formula of secondary alcohol is

• R - OH A
• R - CH₂OH B
• R₂CHOH C
• R₃COH D

Vinegar made form cane sugar, now a days synthetically contains

• Citric acid A
• Lactic acid B
• Acetic acid C
• Palmitic acid 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

In a Galvanic cell, the electrons flow from

• A node to cathode through the solution A
• Cathode to anode through the external circuit B
• Cathode to anode through the external circuit C
• Anode to cathode through the external circuit D

Chief air pollutant which is likely to deplete ozone layer

• Sulphure dioxide A
• Carbon dioxide B
• Nitrogen oxides and chloro fluorocarbons C

Ozone hole refers to

• Hole in ozone layers A
• Reduction in thickness of ozone layer in stratosphere B
• Reduction of thickness of ozone in troposphere C
• Increase concentration of ozone D

Hemoglobin is 68000 times heavier than:

• Oxygen atom A
• Nitrogen atom B
• Carbon atom C
• Hydrogen atom D

Solvent extraction is an equilibrium process and it is controlled by :

• law of mass action. A
• the amount of solvent used. B
• distribution law. C
• the amount of solute. D

Plastics are a pollution problem because many plastics:

• Are made from petroleum A
• Are very inflammable B
• Burn to produce toxic fumes C
• Decompose to produce toxic products D

The ratio of the ionization energy of H and Be³⁺is

• 1 : 1 A
• 1 : 3 B
• 1 : 9 C
• 1 : 16 D

Which are used as essences (flowers)?

• Aldehydes A
• Ketones B
• Alcohols C
• Esters D

Glycine at pH7 has the structure

• H₂N -- CH₂ -- COOH A
• H₃N⁺-- CH₂-- COOH B
• H₂N -- CH₂COO^- C
• H₃N⁺-- CH₂-- COO^- D

Catalytic oxidation of alkanes is used for the preparation of

• Adehydes A
• Ketones B
• Fatty acid C
• Carbonyylic acids D

0.1 MHCI has pH = 1.0, it is about 100 times stronger than acetic acid. Then pH of acetic acid will be

• 0.1 A
• 2.0 B
• 1.3 C
• 3.0 D

A carbon atom carrying a postitive charge and attached to three other atoms of groups is called

• Caronium ion A
• Carbanion B
• Oconium ion C
• Carba ion D

The correct relation b/wK_{c and}K_{p is :}

• K_p = K_c[P/N] ^Δn

  A

• K_{c =} K_p(RT) ^Δn

  B

• K_{p =} K_c(RT) ^Δn

  C

• K_{p =} K_c(RT) ^Δn

  D