List of top Chemistry Questions asked in JEE Main

The incorrect statement is :

Which of the following best describes the diagram below of a molecular orbital ?

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 :

Which of the following are Lewis acids ?

Which of the following is a Lewis acid?

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

How long (approximate) should water be electrolysed by passing through $100$ amperes current so that the oxygen released can completely burn $27.66 \,g$ of diborane ? (Atomic weight of $B = 10.8\, u$ )

When $9.65\,A$ current was passed for $1.0\, hour$ into nitrobenzene in acidic medium, the amount of p-aminophenol produced is_____.

For standardizing NaOH solution, which of the following is used as a primary standard ?

Hydrogen peroxide oxidises $[Fe(CN)6]^{4-}$ to $[Fe(CN)6]^{3-}$ in acidic medium but reduces $[Fe(CN)6]^{3-}$ to$[Fe(CN)6]^{4-}$ in alkaline medium. The other products formed are, respectively

The mass of a non-volatile, non-electrolyte solute (molar mass $= 50\, g\, mol^{-1}$) needed to be dissolved in $114\, g$ octane to reduce its vapour pressure to $75\%,$ is :

The incorrect geometry is represented by :

In Wilkinson?s catalyst, the hybridization of central metal ion and its shape are respectively :

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

At $518^{\circ} C$ , the rate of decomposition of sample of gaseous acetaldehyde, initially at a pressure of $363$ Torr, was $1. 00$ Torr $s^{-1}$ when $5\%$ had reacted and $0.5$ Torr $s^{-1}$ when $33\%$ had reacted. The order of the reaction is -

For $1$ molal aqueous solution of the following compounds, which one will show the highest freezing point ?

Glucose on prolonged heating with $HI$ gives :

When metal ? $M$ ? is treated with $NaOH$, a white gelatinous precipitate ?$X$? is obtained, which is soluble in excess of $NaOH$. Compound ?$X$? when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal ?$M$? is :

Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance ?

Which of the following statements about colloids is False?

Which of the following salts is the most basic in aqueous solution?

Which of the following statements is false?

Which of the following statements is false?

If $50\%$ of a reaction occurs in $100$ second and $75\%$ of the reaction occurs in $200$ second, the order of this reaction is :

A group 13 element 'X' reacts with chlorine gas to produce a compound $XCl _{3} . XCl _{3}$ is electron deficient and easily reacts with $NH _{3}$ to form $Cl _{3} X \leftarrow NH _{3}$ adduct; however, $XCl _{3}$ does not dimerise. $X$ is