List of top Chemistry Questions asked in JEE Main

Match List I with List II:

List I		List II
A	16 g of CH₄ (g)	I	Weight 28g
B	1 g of H₂ (g)	II	60.2 × 10²³ electrons
C	1 mole of N₂ (g)	III	Weighs 32 g
D	0.5 mol of SO₂ (g)	IV	Occupies 11.4 L volume at STP

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The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous NaOH is

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When the hydrogen ion concentration $\left[ H ^{+}\right]$changes by a factor of $1000$ , the value of $pH$ of the solution_____

Match List-I with List-II :

	List-I (Species)		List-II (Maximum allowed concentration in ppm in drinking water)
A	F^-	I	< 50 ppm
B	$SO^{2-}_4$	II	< 5 ppm
C	$NO^-_3$	III	< 2 ppm
D	Zn	IV	< 500 ppm

Choose the correct answer from the options given below :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): $Cu ^{2+}$ in water is more stable than $Cu ^{+}$
Reason (R): Enthalpy of hydration for $Cu ^{2+}$ is much less than that of $Cu ^{+}$
In the light of the above statements, choose the correct answer from the options given below :

Out of the following which has maximum CFSE? ( consider with sign)

Match the following List-I and List-II:

List-I	Industry	List-II	Waste Generated
(A)	Steel Plants	(I)	Gypsum
(B)	Thermal Power Plants	(II)	Fly ash
(C)	Fertilizer industries	(III)	Slag
(D)	Ppaer mills	(IV)	Bio-degradable Wastes

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During the qualitative analysis of $ SO_{3}^{-2}$ using dilute H₂SO₄, SO₂ gas evolved which turns K₂Cr₂O₇ solution (acidified H₂SO₄)

CH₃CH₂-Br $\overrightarrow{Acetone}^{NaI}$ CH₃-CH₂-I+NaBr
Which of the following statement is correct ?

The Lewis acid character of boron tri halides follows the order :

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Beryllium has less negative value of reduction potential compared to the other alkaline earth metals
Reason R: Beryllium has large hydration energy due to small size of $Be ^{2+}$ but relatively large value of atomization enthalpy
In the light of the above statements, choose the most appropriate answer from the options given below

The major product formed in the following reaction is

Thin layer chromatography of a mixture shows the following observation:

The correct order of elution in the silica gel column chromatography is .

Decreasing order towards $S_N1$ reaction for the following compounds is:

The number of atomic orbitals from the following having 5 radial nodes is ___________.
$7s,\ 7p,\ 6s,\ 8p,\ 8d$

A compound 'X' when treated with phthalic anhydride in presence of concentrated $\mathrm{H_2SO_4}$ yields 'Y'. 'Y' is used as an acid/base indicator. 'X' and 'Y' are respectively

The water gas on reacting with cobalt as a catalyst forms

The wavelength of an electron of kinetic energy $4.50 \times 10^{-29}$ J is ___________ $\times 10^{-5}$ m. (Nearest integer)
Given : mass of electron is $9 \times 10^{-31}$ kg, $h = 6.6 \times 10^{-34}$ J s

Match List I with List II

	LIST I Name of reaction		LIST II Reagent used
A.	Hell-Volhard-Zelinsky reaction	I.	$\mathrm{NaOH + I_2}$
B.	Iodoform reaction	II.	(i) $\mathrm{CrO_2Cl_2, CS_2}$ (ii) $\mathrm{H_2O}$
C.	Etard reaction	III.	(i) $\mathrm{Br_2}$ / red phosphorus (ii) $\mathrm{H_2O}$
D.	Gatterman-Koch reaction	IV.	CO, HCl, anhyd. $\mathrm{AlCl_3}$

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The correct order of $\mathrm{pK_a}$ values for the following compounds is:

The compound which will have the lowest rate towards nucleophilic aromatic substitution on treatment with $\mathrm{OH^-}$ is

Group-13 elements react with O₂ in amorphous form to form oxides of type M₂O₃ (M = element). Which among the following is the most basic oxide?

Decreasing order of the hydrogen bonding in following forms of water is correctly represented by
A. Liquid water
B. Ice
C. Impure water
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The one giving maximum number of isomeric alkenes on dehydrohalogenation reaction is
(excluding rearrangement)

During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will favour the reaction