JEE Main 2019: 100 Most Important Solved Questions of Chemistry for April Exam

The national testing agency (NTA) is going to conduct second phase of JEE Main 2019 from 7^th April to 20^th April. There are only two months left for the exam. Few students will have to appear for board exams 2019 in March. Thus, such students have only 7 to 10 days in which they can prepare for JEE Main 2019. In that short span of time, students should study only important topics and questions. Here, we are providing 100 questions which are very important from the exam point of view for JEE Main Chemistry Paper 2019. Chemistry is a very high scoring subject in JEE Main 2019. As per the analysis of JEE Main 2019 January exam, some questions were taken directly from NCERT textbooks and NCERT Exemplar textbooks. Therefore, the subject experts at Jaganjosh.com have collected a set of 100 most important questions for JEE Main April 2019.

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JEE Main Question Papers 2019 with Official Answer Keys (January exam)

Around 80% of the questions asked in JEE Main Chemistry Paper are based on theoretical concepts. While preparing for JEE Main Chemistry, students should focus on theory part more than the numerical part. There are three sections in Chemistry i.e., Physical Chemistry, Inorganic Chemistry and Organic Chemistry. The numerical questions are asked only from Physical Chemistry. The difficulty level of the questions in this subject is easier than the other two subjects i.e., Physics and Mathematics. That’s why, Chemistry is the easiest part in the Joint Entrance Examination (JEE Main) for many students.

The questions are solved using appropriate concepts. Questions are taken from important topics like some basic concepts in chemistry, states of matter, atomic structure, chemical bonding and molecular structure, chemical thermodynamics, solutions, equilibrium, redox reactions and electrochemistry, chemical kinetics, surface chemistry, purification and characterisation of organic compounds, hydrocarbons, chemistry in everyday life, organic compounds containing halogens, organic compounds containing oxygen, organic compounds containing nitrogen, polymers, some basic principles of organic chemistry, biomolecules, hydrogen, block elements (alkali and alkaline earth metals), p-block elements group 13 to group 18 elements, d and f - block elements, co-ordination compounds, environmental chemistry, general principles and processes of isolation of metals, classification of elements and periodicity in properties.

All the aspirants should track their preparedness by practicing more and more questions based on each important topic for JEE Main test. Students can download the complete collection of the questions in the PDF form with the help of the link given at the end of this article.

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Some sample questions are given below:

Question:

Name the structure of silicate in which two oxygen atoms of [SiO₄]^4- are shared.

(a) Pyrosilicate

(b) Sheet silicate

(c) Linear chain silicate

(d) Three dimensional silicate

Solution: (C)

In linear chain silicate, two oxygen atoms per tetrahedron are shared.

Question:

Root mean square velocity of a gas is x ms^-1 at a pressure p atm and temperature T K. If pressure is made 2p under isothermal condition root mean square speed becomes

(a) 2x

(b) 4x

(c) x/2

(d) x

Solution: (d)

Question:

The rms velocity of molecules of a gas of density 4 kg m^-3 and pressure 1.2 × 10⁵ Nm^-2 is

(a) 900 ms^-1

(b) 120 ms^-1

(c) 600 ms^-1

(d) 300 ms^-1

Solution: (d)

Most Important 100 Maths Solved Questions for JEE Main 2019

Question:

One gram of silver gets distributed between 10 cm³ of molten zinc and 100 cm³ of molten lead at 800 ^o C. The percentage of silver in the zinc layer is approximately

(Given: Partition coefficient of Ag in Zn and Pb is 300)

(a) 89

(b) 91

(c) 97

(d) 94

Solution: (c)

Let mass of Ag in Zn = x g

Mass of Ag in Pb = (1 – x) g

As partition coefficient of Ag in Zn and Pb is 300.

Question:

An amount of solid NH₄HS is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm pressure. Ammonium hydrogen sulphide decomposes to yield NH₃ and H₂S gases in the flask. When the decomposition reaction reaches equilibrium, the total pressure in the flask rises to 0.84 atm. The equilibrium constant for NH₄HS decomposition at this temperature is

(a) 0.30

(b) 0.18

(c) 0.17

(d) 0.11

Solution: (d)

To download the complete PDF file, click on the following link:

Chemistry Solved Question for JEE Main 2019