JEE Main Solved Chemistry Practice Paper 2017 - 2018 Set-V

In this article, engineering aspirants will find JEE Main Solved Chemistry Practice Paper 2018 based on the latest pattern and syllabus of the examination. This paper contains of 30 multiple choice questions with only one correct option.

The questions have been taken from different topics like Basic Concepts of Chemistry, Structure of Atom, Classification of Elements & Periodicity in Properties, Chemical Bonding and Molecular Structure, Thermodynamics, Equilibrium, Redox Reactions, Hydrocarbons, Solid State, Solutions, Electrochemistry, Chemical Kinetics, Surface Chemistry, Isolation of Elements, Coordination Compounds, Haloalkanes and Haloarenes, Alcohols, Phenols and Ethers, Aldehydes, Ketones and Carboxylic Acids, Organic Compounds containing Nitrogen, Biomolecules, Polymers and Chemistry in Everyday Life.

JEE Main Chemistry Syllabus 2018

Students will also find the detailed solution of each question which will save their precious time.

Few sample questions from the Solved Chemistry Practice Paper are given below:

Question:

Each polypeptide in a protein has amino acids Linked with each other in. a specific sequence. This sequence of amino acids is said to be......... .

(a) Primary structure of proteins               

(b) Secondary structure of proteins

(c) Tertiary structure of proteins               

(d) Quateranary structure of proteins

Sol. (c)

In primary structure of proteins when each polypeptide in a protein has amino acids linked with each other in a specific sequence. This type of structure is known as primary structure of proteins.

Question:

Which of the following statements regarding Friedel-Crafts reactions is wrong?

(a) Alkylation of benzene with an alkyl chloride requires only a catalytic amount of a Lewis     acid such as aluminum chloride.

(b) Alkylation of benzene with an alcohol requires only a catalytic amount of a   Brønsted  acid such as phosphoric acid.

(c) Acetylation of benzene with acetyl chloride requires only a catalytic amount of a Lewis acid.

(d) Acetylation of benzene with acetic anhydride requires more than one equivalent of a Lewis acid.

Sol. (c)

Acetylation of benzene with acetyl chloride requires only a catalytic amount of a Lewis acid.

Friedel-Crafts acylation reaction

Question:

Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult's law?

(a) Methanol and acetone

(b) Chloroform and acetone

(c) Nitric acid and water

(d) Phenol and aniline

Sol. (a)

In pure methanol, molecules are hydrogen bonded. On adding acetone, its molecules get in between the host molecules and break some of the hydrogen bonds between them.

Therefore, the intermolecular attractive forces between the solute-solvent molecules are weaker than those between the solute-solute and solvent-solvent molecules.

On the other hand, other three remaining options will show negative deviation from Raoult's law where the intermolecular attractive forces between the solute-solvent molecules are stronger than those between the solute-solute and solvent-solvent molecules.

Question:

Which among the following is the most reactive?                                                     

(a) Cl₂

(b) Br₂

(c) I₂

(d) ICl

Sol. (d)

Cl₂, Br₂ and I₂ are homonuclear diatomic molecular in which electronegativity of the combining atoms is same, so they are more stable and less reactive, whereas, I and Cl have different electronegativities and bond between them are polarized and reactive. Therefore, interhalogen compound are more reactive.

Question:

Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

(a) [Xe]Af ⁷ 5d¹6s²                                          

(b) [Xe]4f ⁶5d²6s²

(c) [Xe]4f ⁸ 6d²                                               

(d) [Xe]4f ⁹5s¹

Sol. (a)

Gadolinium belongs to 4f series and has atomic number 64. The correct electronic configuration of gadolinium is

₆₄Gd = ₅₄[Xe]4f ⁷ 5d¹ 6s²

It has extra stability due to half-filled 4 f subshell.

Question:

Which of the following process is responsible for the formation of delta at a place where rivers meet the sea?

(a) Emulsification                                      

(b) Colloid formation

(c) Coagulation                                          

(d) Peptisation

Sol. (c)

River water is a colloidal solution of clay and sea. Water contains various electrolytes. When river water comes in contact with sea water, then the electrolytes present in sea water coagulate the suspended colloidal particles which ultimately settle down at the point of contact.

Conclusion:

This solved practice paper will help students in their final level of preparation. Students can also match their solution with the solution given in this paper. It will help students to manage speed and accuracy in JEE Main 2018.

Download Complete Practice Paper

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