List of top Chemistry Questions asked in JEE Main

\(BeCl_2\) reacts with \(LiAlH_4\) to give:

Heating white phosphorus with conc. \(NaOH\) solution gives mainly:

Given below are two Statements:
Statement I: Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and sulphur dioxide.
Statement II: Photochemical smog has components, ozone, nitric oxide, acrolein, formaldehyde, PAN etc.
In the light of the above statements, choose the most appropriate answer from the options given below.

The major product of the following reaction is:

Match List-I with List-II
List-I
(A) Spontaneous process
(B) Process with \(ΔP = 0\), \(ΔT = 0\)
(C) \(ΔH_{reaction}\)
(D) Exothermic Process
List-II
(I) \(ΔH < 0\)
(II) \(ΔG_{T,P} < 0\)
(III) Isothermal and isobaric process
(IV) [Bond energies of molecules in reactants] – [Bond energies of product molecules]
Choose the correct answer from the options given below :

Match List-I with List-II

	List i		List II
A.		i	Dishwashing power
B.		ii	Toothpaste
C.	\(C_{17}H_{35}COO^–Na^++Na_2CO_3+Rosinate\)	iii	Laundry soap
D.	\(CH_3(CH_2)_{16}COO(CH_2CH_2O)CH_2CH_2OH\)	iv	Hair conditional

Choose the correct answer from the options given below:

Based upon VSEPR theory, match the shape (geometry) of the molecules in List-I with the molecules in
List-II and select the most appropriate option.
List-I List-II
(Shape) (Molecules)
(A) T-shaped (I) XeF4
(B) Trigonal planar (II) SF4
(C) Square planar (III) CIF3
(D) See-saw (IV) BF3

The oxide which contains an odd electron at the nitrogen atom is

The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The ionic radii of \(O^{2–}\) and \(Mg^{2+}\) are same.
Reason (R) : Both \(O^{2–}\) and \(Mg^{2+}\) are isoelectronic species.
In the light of the above statements, choose the correct answer from the options given below.

Match List-I with List-II.

	(Si-Compounds)		(Si-Polymeric/other Products)
A.	\((CH_3)_4Si\)	i	Chain Silicone
B.	\((CH_3)Si(OH)_3\)	ii	Dimeric Silicone
C.	\((CH_3)_2Si(OH)_2\)	iii	Silane
D.	\((CH_3)_3Si(OH)\)	iv	2D-Silicone

Choose the correct answer from the options given below:

Match List I with List II

List I Enzyme		List II Conversion of
A	Invertase	I	Starch into maltose
B	Zymase	II	Maltose into glucose
C	Diastase	III	Glucose into ethanol
D	Maltase	IV	Cane sugar into glucose

Choose the most appropriate answer from the options given below:

Which of the following will have maximum stabilization due to crystal field?

Which one of the following is an example of disproportionation reaction?

Given below are two statements:
Statement-I : In Hofmann degradation reaction, the migration of only an alkyl group takes place from carbonyl carbon of the amide to the nitrogen atom.
Statement-II : The group is migrated in Hofmann degradation reaction to electron deficient atom.
In the light of the above statements, choose the most appropriate answer from the options given below:

The correct order of bond orders of \(C_2^{2-}, N_2^{2-}, O_2^{2-}\) is, respectively

Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 gof water, it depresses the freezing point by 0.2°C. The percentage association of solute A in water is :

[Given : Molar mass of A = 93 g mol^–1. Molal depression constant of water is 1.86 K kg mol^–1.]

In the industrial production of which of the following, molecular hydrogen is obtained as a byproduct?

The correct order of electron gain enthalpies of Cl, F, Te and Po is

For a first order reaction, the time required for completion of 90% reaction is ‘x’ times the half life of the reaction. The value of ‘x’ is (Given: In 10 = 2.303 and log 2 = 0.3010)

Given below are two statements one is labelled as Assertion A and the other is labelled as Reason R:

Assertion A: The amphoteric nature of water is explained by using Lewis acid/base concept

Reason R: Water acts as an acid with NH3 and as a base with H₂S.

In the light of the above statements choose the correct answer from the options given below:

At 25°C and 1 atm pressure,the enthalpies of combustion are as given below:

\(Substance\)	\(H_2\)	\(C(graphite)\)	\(C_2H_6(g)\)
\(\frac{D_cH^{\theta}}{kJmol^{-1}}\)	\(-286.0\)	\(-394.0\)	-1560.0

The enthalpy of formation of ethane is

At 25°C and 1 atm pressure, the enthalpy of combustion of benzene (I) and acetylene (g) are –3268 kJ mol^–1 and –1300 kJ mol^–1, respectively. The change in enthalpy for the reaction 3C₂H₂(g) → C₆H₆(I), is

The IUPAC name of ethylidene chloride is:

Given below are two statements.

Statement-I: During electrolytic refining, blister copper deposits precious metals.

Statement-II: In the process of obtaining pure copper by electrolysis method, copper blister is used to make the anode.

In the light of the above statements, choose the correct answer from the options given below.