List of top Chemistry Questions asked in JEE Main

Product of D-aldotetroses with conc. \(HNO_3\) gives optically inactive dicarboxylic acid. Which among the following will be D-Aldotetrose in the given structures? 

Compare acidic strength of the following compounds:
 (I) Phenol (II) \(p\)-Nitrophenol (III) \(p\)-Methylphenol (IV) \(p\)-Nitrobenzoic acid (V) Benzoic acid

For the reaction: \[ R \rightarrow P \] The variation of concentration of reactant \([R]\) with time is shown below. Statements: I. Curve 1 will be observed when order of reaction is 1. II. If curve 2 & curve 3 are observed for \(1^{st}\) order then rate constant for \(3^{rd}\) curve will be greater than rate constant for \(2^{nd}\) curve. III. Decomposition of HI on gold surface represent curve (1). Select the option representing correct set of statements: 

Consider the following setup separated by a semi–permeable membrane (SPM): Left compartment (x): \(K_4[Fe(CN)_6]\) solution \(0.1\,M\), \(100\,ml\) Right compartment (y): \(FeCl_3\) solution \(0.1\,M\), \(100\,ml\) Which of the following is correct for the above figure?

From given data (I) 90.8 lit of \(H_2(g)\) at STP (II) 684 gm of sucrose (III) 2 moles of cyclohexane Correct order of total number of atoms will be
When 3.395 gm \(C_2H_5OH_{(l)}\) is burnt completely, it liberates 101.11 kJ of heat, then find the enthalpy of formation of \(C_2H_5OH_{(l)}\). Given: \(\Delta H_f^\circ\) of \(H_2O_{(l)} = -285.8 \, \text{kJ/mol}\) \(\Delta H_c^\circ\) of graphite \(= -393.5 \, \text{kJ/mol}\)
Which of the following have same radius according to Bohr's theory : (A) Radius of \(1^{st}\) orbit of H-atom.
(B) Radius of \(1^{st}\) orbit of He\(^{+}\).
(C) Radius of \(II^{nd}\) orbit of He\(^{2+}\).
(D) Radius of \(II^{nd}\) orbit of Li\(^{2+}\).
(E) Radius of \(II^{nd}\) orbit of Be\(^{3+}\).
For a given reversible reaction at \(300\,K\): \[ 2\text{N}_2\text{O}_5(g) \rightleftharpoons 4\text{NO}_2(g) + \text{O}_2(g) \] If \( \text{N}_2\text{O}_5 \) is 50% dissociated at 5 bar and 300 K at equilibrium, then find \( \Delta G^\circ \) for the reaction? [Given: \( \log 2 = 0.3,\ \log 7 = 0.84 \)]
20 ml of CH\(_3\)COOH solution is neutralised by 28.08 ml of NaOH. In the 20 ml of same solution 14.04 ml of same NaOH solution is poured, then pH of resultant solution will be: (pKa of CH\(_3\)COOH = 4.75)
Given that: \[ E^\circ_{\text{Fe}^{3+}/\text{Fe}} = -0.036\, \text{V} \quad \text{and} \quad E^\circ_{\text{M}^{x+}/\text{M}} = 0.15\, \text{V} \] A Galvanic cell is formed using above electrodes, whose \( E_{\text{cell}} = 0.2047\, \text{V} \) when reaction quotient of cell reaction is \(10^{-2}\). Find the value of \(x\). [Nearest integer]
Manganese forms oxide and fluoride with highest oxidation state. The difference in the highest oxidation state of Mn in the oxide and fluoride is:

Two atoms are bonding along the Z-axis. How will the \( \pi^* \) orbital look like (Z is the internuclear axis)? 

Relationship between following pair of compounds?

For the first order reaction \[ A \rightarrow P \] Based on the given data, find the time \(x\) (in min):

Given:
\(t = 0 \, \text{min} \Rightarrow [A] = 0.625 \, M\)
\(t = x \, \text{min} \Rightarrow [A] = 0.0625 \, M\)
\(t = 20 \, \text{min} \Rightarrow [A] = 0.00625 \, M\)
1 gm of organic compound gave 1.32g $\text{CO}_2$, 0.53g of same compound gave 0.75g AgBr. If molecular formula of compound is $\text{C}_x\text{H}_y\text{Br}_z$ then calculate percentage of hydrogen in the given compound.
If the minimum wavelength for H-atom in the Lyman series is 'x', then the maximum wavelength of the Balmer series of He\(^+\) ion in terms of 'x' will be:


 

The sum of the series \( 1 + \frac{1}{2}(1^2 + 2^2) + \frac{1}{3}(1^2 + 2^2 + 3^2) + \dots \) up to 10 terms is:
Let \( \lim_{x \to 2} \frac{\tan(x - 2)\,[r x^2 + (p - 2)x - 2p]}{(x - 2)^2} = 5 \) for some \( r, p \in \mathbb{R} \). If the set of all possible values of \( q \), such that the roots of the equation \( r x^2 - p x + q = 0 \) lie in \( (0, 2) \), be the interval \( (\alpha, \beta] \), then \( 4(\alpha + \beta) \) is equal to:
For given four processes compare magnitude of work:
Given below are two statements: Statement-I: Methane can be prepared by decarboxylation of sodium acetate, by Kolbe’s electrolysis, and by \( \text{CH}_3\text{MgBr} \).
Statement-II: Methane can’t be prepared by unsaturated hydrocarbon and by Wurtz reaction. Choose the correct option:
Find the percentage of nitrogen in the final product.
Statement-I: 3-Phenylprop-1-ene will react with HBr and give alkyl halide as the major product having 1 chiral carbon atom. Statement-II: Aryl chloride and Aryl cyanide both can be formed by Gattermann and Sandmeyer reactions.
Given below are two statements: Statement-I: 2,4-Diethylcyclohexanone and 2-methyl-6-propylcyclohexanone are metameres.
Statement-II: 2,2,6,6-Tetraethylcyclohexanone will show tautomerism. Choose the correct option:
4.7 g of phenol \( \xrightarrow{Zn,\Delta} X \)
If the reaction goes to 60% yield of X, find the number of moles of ‘X’ formed.