List of top Chemistry Questions asked in JEE Main

Green chemistry in day-to-day life is in the use of :

The set in which compounds have different nature is :

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Sharp glass edge becomes smooth on heating it upto its melting point.

Reason R : The viscosity of glass decreases on melting.

Choose the most appropriate answer from the options given below.

Compound A is converted to B on reaction with \(\mathrm{CHCl_3}\) and KOH. The compound B is toxic and can be decomposed by C. A, B and C respectively are :

For above chemical reactions, identify the correct statement from the following :

Which among the above compound/s does/do not form Silver mirror when treated with Tollen's reagent?

In the given reaction
3-Bromo-2, 2-dimethyl butane \(\xrightarrow{\mathrm{C_2H_5OH}}\) 'A' (Major Product)
Product A is :

Identify the incorrect statement from the following

An inorganic Compound 'X' on treatment with concentrated \(\mathrm{H_2SO_4}\) produces brown fumes and gives dark brown ring with \(\mathrm{FeSO_4}\) in presence of concentrated \(\mathrm{H_2SO_4}\). Also Compound 'X' gives precipitate 'Y', when its solution in dilute HCl is treated with \(\mathrm{H_2S}\) gas. The precipitate 'Y' on treatment with concentrated \(\mathrm{HNO_3}\) followed by excess of \(\mathrm{NH_4OH}\) further gives deep blue coloured solution, Compound 'X' is :

Among the given species the Resonance stabilised carbocations are :

The correct structure of Rhumann's Purple, the compound formed in the reaction of ninhydrin with proteins is :

According to the valence bond theory the hybridization of central metal atom is \(dsp^2\) for which one of the following compounds?

The correct order of intensity of colors of the compounds is :

The total number of C-C sigma bond/s in mesityl oxide (\(\mathrm{C_6H_{10}O}\)) is __________. (Round off to the Nearest Integer).

A 1 molal \(\mathrm{K_4Fe(CN)_6}\) solution has a degree of dissociation of 0.4. Its boiling point is equal to that of another solution which contains 18.1 weight percent of a non electrolytic solute A. The molar mass of A is __________ u. (Round off to the Nearest Integer). [Density of water = 1.0 g cm^\(-3\) ]

The number of chlorine atoms in 20 mL of chlorine gas at STP is _________ \(10^{21}\). (Round off to the Nearest Integer).

[Assume chlorine is an ideal gas at STP

R = 0.083 L bar mol^\(-1\) K^\(-1\), \(N_A = 6.023 \times 10^{23}\)]

A KCl solution of conductivity \(0.14\ \mathrm{S\ m^{-1}}\) shows a resistance of \(4.19\ \Omega\) in a conductivity cell. If the same cell is filled with an HCl solution, the resistance drops to \(1.03\ \Omega\). The conductivity of the HCl solution is ____________ \(\times 10^{-2}\ \mathrm{S\ m^{-1}}\). (Round off to the Nearest Integer).

Consider the above reaction. The percentage yield of amide product is __________. (Round off to the Nearest Integer).

(Given : Atomic mass : C : 12.0 u, H : 1.0 u, N : 14.0 u, O : 16.0 u, Cl : 35.5 u)

KBr is doped with \(10^{-5}\) mole percent of \(\mathrm{SrBr_2}\). The number of cationic vacancies in 1g of KBr crystal is ____________ \(10^{14}\). (Round off to the Nearest Integer).

[Atomic Mass : K : 39.1 u, Br : 79.9 u \(N_A = 6.023 \times 10^{23}\)]

Consider the reaction

\(\mathrm{N_2O_4(g)} \rightleftharpoons 2\mathrm{NO_2(g)}\)

The temperature at which \(K_C = 20.4\) and \(K_P = 600.1\), is ____________ K. (Round off to the Nearest Integer). [Assume all gases are ideal and \(R = 0.0831\ \mathrm{L\ bar\ K^{-1}\ mol^{-1}}\)]

On complete reaction of \(\mathrm{FeCl_3}\) with oxalic acid in aqueous solution containing KOH, resulted in the formation of product A. The secondary valency of Fe in the product A is __________. (Round off to the Nearest Integer).

The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins, respectively, are :

Match List - I with List - II.

	List - I Chemical Compound		List - II Used as
(a)	Sucralose	(i)	Synthetic detergent
(b)	Glyceryl ester of stearic acid	(ii)	Artificial sweetener
(c)	Sodium benzoate	(iii)	Antiseptic
(d)	Bithionol	(iv)	Food preservative

Choose the correct match :

Match List - I with List - II :

	List - I		List - II
(a)	Haematite	(i)	\(Al_2O_3\cdot xH_2O\)
(b)	Bauxite	(ii)	\(Fe_2O_3\)
(c)	Magnetite	(iii)	\(CuCO_3\cdot Cu(OH)_2\)
(d)	Malachite	(iv)	\(Fe_3O_4\)

Choose the correct answer from the options given below :

One of the by-products formed during the recovery of \(\mathrm{NH_3}\) from Solvay process is :