List of top Chemistry Questions asked in JEE Main

Given below are two statements: Statement (I): \textit{Nitrogen, sulphur, halogen, and phosphorus present in an organic compound are detected by Lassaigne's Test.}
Statement (II): \textit{The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test.} In the light of the above statements, choose the correct answer from the options given below:
Match the Compounds (List - I) with the appropriate Catalyst/Reagents (List - II) for their reduction into corresponding amines. \includegraphics[width=1\linewidth]{b.png}
Find the dimensions of Bμ0 \frac{B}{\mu_0}

Compare boiling point of given solutions:

(i) 10−4 M NaCl 10^{-4} \, \text{M NaCl} >(ii) 10−3 M NaCl 10^{-3} \, \text{M NaCl} >(iii) 10−2 M NaCl 10^{-2} \, \text{M NaCl} >(iv) 10−4 M urea 10^{-4} \, \text{M urea}  

(iii) 10−2 M NaCl 10^{-2} \, \text{M NaCl} >(ii) 10−3 M NaCl 10^{-3} \, \text{M NaCl} >(i) 10−4 M NaCl 10^{-4} \, \text{M NaCl} >(iv) 10−4 M urea 10^{-4} \, \text{M urea}  

(ii) 10−3 M NaCl 10^{-3} \, \text{M NaCl} >(i) 10−4 M NaCl 10^{-4} \, \text{M NaCl} >(iii) 10−2 M NaCl 10^{-2} \, \text{M NaCl} >(iv) 10−4 M urea 10^{-4} \, \text{M urea}  

(iii) 10−2 M NaCl 10^{-2} \, \text{M NaCl} >(ii) 10−3 M NaCl 10^{-3} \, \text{M NaCl} >(i) 10−4 M NaCl 10^{-4} \, \text{M NaCl} >(iv) 10−4 M urea 10^{-4} \, \text{M urea}  
 

What is the hybridization of the central atom in the molecule SO3 \text{SO}_3 ?
A weak acid HA has degree of dissociation x. Which option gives the correct expression of pH−pKapH - pK_a?
For [NiCl4]2−[ \text{NiCl}_4 ]^{2-}, what is the charge on metal and shape of complex respectively?
Which of the following is the correct order of acidic strength for the following compounds: HNO3_3, HClO4_4, and HClO3_3?
The molecules having square pyramidal geometry are:
Consider the following elements In, Tl, Al, Pb, and Ge. The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are:
In a multielectron atom, which of the following orbitals described by three quantum numbers will have the same energy in absence of electric and magnetic fields?
A. n=1,l=0,ml=0 n = 1, l = 0, m_l = 0
B. n=2,l=0,ml=0 n = 2, l = 0, m_l = 0
C. n=2,l=1,ml=1 n = 2, l = 1, m_l = 1
D. n=3,l=2,ml=1 n = 3, l = 2, m_l = 1
E. n=3,l=2,ml=0 n = 3, l = 2, m_l = 0
Choose the correct answer from the options given below:
What is the freezing point depression constant of a solvent, 50 g of which contain 1 g non-volatile solute (molar mass 256 g mol−1^{-1}) and the decrease in freezing point is 0.40 K?
Which of the following oxidation reactions are carried out by both K2Cr2O7 K_2Cr_2O_7 and KMnO4 KMnO_4 in acidic medium?
A. I−→I2 I^- \rightarrow I_2
B. S2−→S S^{2-} \rightarrow S
C. Fe2+→Fe3+ Fe^{2+} \rightarrow Fe^{3+}
D. I−→IO3− I^- \rightarrow IO_3^-
E. S2O32−→SO42− S_2O_3^{2-} \rightarrow SO_4^{2-}
Choose the correct answer from the options given below:
The correct order of stability of following carbocations is:
The correct order of stability of following carbocations is
Match the LIST-I with LIST-II (Redox Reactions).
Redox Reaction;type of Redox Reaction
Choose the correct answer from the options given below:
Both acetaldehyde and acetone (individually) undergo which of the following reactions?
A. Iodoform Reaction
B. Cannizzaro Reaction
C. Aldol Condensation
D. Tollen's Test
E. Clemmensen Reduction
Choose the correct answer from the options given below:
Given below are two statements:
Statement I: D-glucose pentaacetate reacts with 2,4-dinitrophenylhydrazine.
Statement II: Starch, on heating with concentrated sulfuric acid at 100°C and 2-3 atmosphere pressure, produces glucose.
In the light of the above statements, choose the correct answer from the options given below:
The compounds that produce CO2_2 with aqueous NaHCO3_3 solution are:
The compounds that produce CO2 with aqueous NaHCO3 solution are:
In the reaction 2A+B→C 2A + B \rightarrow C , if the rate law is Rate=k[A]2[B] \text{Rate} = k[A]^2[B] , what is the overall order of the reaction?
Ice and water are placed in a closed container at a pressure of 1 atm and temperature 273.15K. If pressure of the system is increased 2 times, keeping temperature constant, then identify correct observation from the following:
Given below are two statements:
will undergo alkaline hydrolysis at a faster rate than
, intramolecular substitution takes place first by involving lone pair of electrons on nitrogen.
The molarity of a 70%(mass/mass) aqueous solution of a monobasic acid (X) is:
Given below is the plot of the molar conductivity vs c \sqrt{c} concentration for KCl in aqueous solution. If, for the higher concentration of KCl solution, the resistance of the conductivity cell is 100 Ω \Omega , then the resistance of the same cell with the dilute solution is 'x' Ω \Omega . The value of x x is:
Quantitative analysis of an organic compound (X) shows the following percentage composition. C: 14.5% Cl: 64.46% H: 1.8% Empirical formula mass of the compound (X) is:

In the given structure, number of sp sp and sp2 sp^2 hybridized carbon atoms present respectively are: