List of top Chemistry Questions asked in JEE Main

The most polar compound among the following is :

According to molecular orbital theory, which of the following will not be a viable molecule ?

$N_2O_5$ decomposes to $NO_2$ and $O_2$ and follows first order kinetics. After $50$ minutes, the pressure inside the vessel increases from $50\, mm\, Hg$ to $87.5\, mm\, Hg.$ The pressure of the gaseous mixture after $100$ minute at constant temperature will be :

In which of the following reactions, an increase in the volume of the container will favour the formation of products ?

Which of the following conversions involves change in both shape and hybridisation?

Which of the following is a Lewis acid?

The INCORRECT statement is :

Which of the following are Lewis acids ?

Biochemical Oxygen Demand (BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ?

The decreasing order of bond angles in $BF_{3} , NH_{3} , PF_{3}$ and $I_{3}{^{-}}$ is

The increasing order of the acidity of the following carboxylic acids is :

Xenon hexafluoride on partial hydrolysis produces compounds ?X? and ?Y?. Compounds ?X? and ?Y? and the oxidation state of Xe are respectively :

For a first order reaction, $A \to P, t_{1/2}$ (half life) is 10 days. The time required for $\frac{1^{th}}{4}$ conversion of A (in days) is : (ln 2=0.693, ln 3=1.1)

An aqueous solution contains $0.10 \, M \, H_2S$ and $0.20 \, M \, HCl$ . If the equilibrium constants for the formation of $HS^-$ from $H_2S$ is $1.0 \times 10^{-7}$ and that of $S^{2- }$ from $HS^-$ ions is $ 1.2 \times 10^{-13}$ then the concentration of $S^{2-}$ ions in aqueous solution is -

The combustion of benzene $ (l)$ gives $CO_2(g)$ and $H_2O(l)$ . Given that heat of combustion of benzene at constant volume is $-3263.9 \, kJ \, mol^{-1}$ at $25^{\circ} C$ ; heat of combustion (in $ kJ \, mol^{-1}$ ) of benzene at constant pressure will be -$ (R = 8.314 \, JK^{-1} \, mol^{-1}) $

At a certain temperature in a 5 L vessel, 2 moles of carbon monoxide and 3 moles of chlorine were allowed to reach equilibrium according to the reaction,$CO + Cl_{2} <=> COCl_2 $ At equilibrium, if one mole of CO is present then equilibrium constant $(K_c)$ for the reaction is :

The incorrect geometry is represented by :

Lithium aluminium hydride reacts with silicon tetrachloride to form :

The ratio of mass percent of $C$ and $H$ of an organic compound $\left( C _{ X } H _{ Y } O _{ Z }\right)$ is $6: 1 .$ If one molecule of the above compound $\left( C _{ X } H _{ Y } O _{ Z }\right)$ contains half as much oxygen as required to burn one molecule of compound $C _{X} H_{Y}$ completely to $CO _{2}$ and $H _{2} O$. The empirical formula of compound $C _{ X } H _{ Y } O _{ Z }$ is

The increasing order of basicity of the following compounds is :

For $Na^{+}, Mg^{2+}, F^{-}$ and $O^{2-}$; the correct order of increasing ionic radii is :

Which of the following statements about colloids is False?

Which of the following statements is false?

In a complexometric titration of metal ion with ligand $M ($ Metal ion $)+ L ($ Ligand $) \rightarrow C ($ Complex $)$ end point is estimated spectrophotometrically (through light absorption). If 'M' and 'C' do not absorb light and only 'L' absorbs, then the titration plot between absorbed light ( $A$ ) versus volume of ligand 'L' $(V)$ would look like

In the extraction of copper from its sulphide ore, metal is finally obtained by the oxidation of cuprous sulphide with :