List of top Chemistry Questions asked in JEE Main

Read the following two statements
Statement I: Ionic radius of Li+ is greater than Mg++
Statement II: Lithium and magnesium can't form superoxide
Which of the following shows an incorrect method of refining?
Which of the following metals can be extracted through alkali leaching technique?
How many factors will contribute to a major role in covalent character of a compound.
  1. Polarising power of cation
  2. Polarisability of the anion
  3. Distortion caused by cation
  4. Polarisability of cation

Sulphur (S)-containing amino acids from the following are:
(a) Isoleucine
(b) Cysteine
(c) Lysine
(d) Methionine
(e) Glutamic acid

CH3CH2-Br \(\overrightarrow{Acetone}^{NaI}\) CH3-CH2-I+NaBr
Which of the following statement is correct ? 
Which of the following elements is most reactive?
What happens when lyophilic sol is added to lyophobic sol. prevention from coagulation precipitation emulsion electrophoresis
Consider the following:
  1. D.D.T.
  2. Aldrin
  3. Sodium arsenite
  4. Sodium chlorate
How many of these are pesticides?
Consider the reaction \(Cu^{2+} + X^- → Cu_2X_2 + X_2\).
X2 will be predominantly?
The pair of lanthanides will exceptionally high 3rd ionisation enthalpy than neighbouring elements:
Select the correct order of electronegativity of the elements: B, C, At, S
XeF$_4$ reacts with SbF$_5$ to form:
\[ [\text{XeF}_m]^{n+}[\text{SbF}_y]^{z-} \] What is $m+n+y+z$?
Incorrect statement about Borazine is:
How many statements are correct:
  1. If there is no relation between rate constant and temperature, then activation energy is negative.
  2. If the activation energy is zero, rate constant is temperature independent.
  3. If rate constant increases with increase of temperature, activation energy is positive.
  4. If rate constant decreases with increase in temperature, activation energy is negative.

Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R).
Assertion (A): Acidic nature follows the order:

Reason (R): F is a better electron-withdrawing group than Cl
In the light of the above statements, write the detailed answer:

How many bromo products are formed when ethane is reacted with excess of Br2 on heating?

Choose the correct option.

Predict expression from α in terms of \(K_{eq}\) and concentration C : 

\(A_2 B_3(aq) \leftrightharpoons 2{A_3} (aq)+3B_{{2-}}(aq)\)

A binary compound has Y-atoms forming FCC unit cell and another type of X-atoms occupying \(\frac{1}{3}\)rd of tetrahedral voids. Find out the molecular formula of the compound

 

In which of the following pairs of elements electron gain enthalpy difference is highest?

Order of Covalent bond:
A. $KF > KI ; LiF > KF$ 
B. $KF < KI ; LiF > KF$ 
C. $SnCl _4> SnCl _2 ; CuCl > NaCl$ 
D. $LiF > KF ; CuCl <NaCl$
E. $KF < KI ; CuCl > NaCl$ 
Choose the correct answer from the options given below:
Which of the following have square pyramidal structure?
Match the terms in Column-I with their description in Column-II and choose the correct option :
Column IColumn II
(i)Vitamin AaBeri-beri
(ii)Vitamin C (Ascorbic acid)bCheilosis
(iii)RiboflavincXerophthalmia
(iv)ThiaminedScurvy
Number of ambidentate ligands in given complex [M(en)(SCN)4]: