List of top Chemistry Questions asked in JEE Main

Which of the following statement is incorrect?

Identify the major products A and B for the below given reaction sequence.
Identify the major products A and B for the below given reaction sequence.

 

The correct order of density is
High purity (>99.95%) dihydrogen is obtained by
A sample of 4.5 mg of an unknown monohydric alcohol, R–OH was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measured to be 3.1 mL. The molecular weight of the unknown alcohol is___ g/mol. [Nearest integer]

For the decomposition of azomethane, CH3N2CH3(g) → CH3CH3(g) + N2(g), a first-order reaction, the variation in partial pressure with time at 600 K is given as
The half-life of the reaction is ______ × 10–5s. [Nearest integer]

In base vs acid titration, at the endpoint methyl orange is present as
The correct structure of C is
structure of C
Arrange the following in decreasing acidic strength.
decreasing acidic strength.
150 g of acetic acid was contaminated with 10.2 g ascorbic acid (C6H8O6) to lower down its freezing point by (x × 10–1)°C. The value of x is ______. (Nearest integer)
(Given : Kf = 3.9 K kg mol–1; molar mass of ascorbic acid = 176 g mol–1)
What is the major product of the following reaction?
major product of the following reaction
The disproportionation of MnO42- in acidic medium resulted in the formation of two manganese compounds A and B. If the oxidation state of Mn in B is smaller than that of A, then the spin-only magnetic moment (μ) value of B in BM is _______. (Nearest integer)
On complete combustion of 0.492 g of an organic compound containing C, H and O, 0.7938 g of CO2 and 0.4428 g of H2O was produced. The % composition of oxygen in the compound is _______.
The major product of the following reaction is
major product of the following reaction

Total number of relatively more stable isomer(s) possible for octahedral complex [Cu(en)2(SCN)2] wiil be ______.

The number of interhalogens from the following having square pyramidal structure is :CIF3, IF7, BrF5, BrF3, I2CI6, IF5, CIF, CIF5

For the given first order reaction A → B, the half-life of the reaction is 0.3010 min. The ratio of the initial concentration of reactant to the concentration of reactant at time 2.0 min will be equal to ______. (Nearest integer)

Ka for butyric acid (C3H7COOH) is 2 × 10–5. The pH of 0.2 M solution of butyric acid is ______× 10–1. (Nearest integer) (Given log2 = 0.30)

The number of paramagnetic species among the following is ____B2,Li2,C2,C-2, O22--,O2+ and He2+

On reaction with stronger oxidizing agent like KIO4, hydrogen peroxide oxidizes with the evolution of O2. The oxidation number of I in KIO4 changes to____.
Some drugs bind to a site other than the active site of an enzyme. This site is known as
The compound(s) that is(are) removed as slag during the extraction of copper is 
(A) CaO 
(B) FeO 
(C) Al2O3 
(D) ZnO 
(E) NiO 
Choose the correct answer from the options given below :

Match List-I with List-II List-I 

 List-IList-I i
ReactionCatalyst
\(4 NH _3( g )+5 O _2( g ) \rightarrow 4 NO ( g )+6 H _2 O ( g )\)NO(g)
\(N _2( g )+3 H _2( g ) \rightarrow 2 NH _3( g )\)H_2SO_4(l)
\(C _{12} H _{22} O _{11}( aq ) H _2 O (l) \rightarrow \text { (Glucose) }+ C _6 H _{12} O _6 C _6 H _{12} O _6\)Pt(s) 
\( SO _2( g )+ O _2( g ) \rightarrow 2 SO _3( g )\)Fe(s)

Choose the correct answer from the options given below:

Match List - I with List - II 
                                   List I                                                                                  List II
A \(N _2( g )+3 H _2( g ) \rightarrow 2 NH _3( g )\)                                                                   I \(Cu\)  
B \(CO ( g )+3 H _2( g ) \rightarrow CH _4( g )+ H _2 O ( g )\)                                      II \(Cu / ZnO - Cr _2 O _3\) 
C \(CO ( g )+ H _2( g ) \rightarrow HCHO ( g )\)                                               III \(Fe _x O _y+ K _2 O + Al _2 O _3\) 
D \(CO ( g )+2 H _2\) (g) \(\rightarrow CH _3 OH ( g )\)                                                             IV \(Ni\) 
Choose the correct answer from the optionsgiven below :
Match List - I with List - II 
List-I (Compound)                                              List-II (Shape)
A \(BrF _5\)                                                                    I bent 
B \(\left[ CrF _6\right]^{3-}\)                                                             II square pyramidal
C \(O _3\)                                                                     III trigonal bipyramidal 
D \(PCl _5\)                                                                    IV octahedral 
Choose the correct answer from the optionsgiven below :