List of top Chemistry Questions asked in JEE Main

Given:
(i) Cu2++2e−→Cu,E0=0.337 V
(ii) Cu2++e−→Cu+,E0=0.153
Standard electrode potential, E∘ for the reaction, Cu+e−→Cu, will be (in volts):

Chemical A is used for water softening to remove temporary hardness, A reacts with Na2Co3 to generate caustic soda. When CO2 is bubbled through A, it turns cloudy. If  the chemical formula of A is \(Ca (OH)_{2} + CO_{2}  \rightarrow  CaCo_{?}  \downarrow + H_{2}O   \)  then what is the value of ?

Hydrogen ion concentration of an aqueous solution is 1 × 10-4 M.  The solution is diluted with equal volume of water.  Hydroxyl ion concentration of the resultant solution in terms of p×10-10 mol dm-3 . What is the value of p?
Find out the shortest wavelength of paschen series for H- atom
Product B is:
ethoxy benzene reacts with HNO3/H2SO4
Match the column.
Column-I
(Compounds)		Column-II
(Configurations)
A.TiCl4(1)e3t23
B.FeO42-(2)e2t20
C.FeCl42-(3)e2t23
D.MnCl42-(4)e0t20
Find out value of $C_p/C_y$ for an ideal gas undergoing reversible adiabatic process for which $P ∝ T^3$ is given
Which of the following is true regarding coagulation of egg:
From the given information, calculate enthalpy of formation of 2 moles of $C_6H_6$(l) at 25°C. Given: $CH(C_6H_6$(l)) = –3264.6 kJ/mol $CH(C(s))$ = –393.5 kJ/mol $fH(H_2O(l))$ = –285.83 kJ/mol
Find out E cell of the given cell M | M2+ | | x2-|x.|
EºM2+I M = 0.34 V
E°x|x2- = 0.46 V
Which of the following d-block elements has maximum unpaired electron in ground state electronic configuration?
At 25∘C, the solubility product of Mg(OH)2 is 1.0×10−11. At which pH, will Mg2+ ions start precipitating in the form of Mg(OH)2 from a solution of 0.001MMg2+ ions ?
Identify the product formed in the following reaction:
aqueous sodium hydroxide (NaOH)
Among the following anions, identify the anion which gives pale yellow precipitate with aq. AgNO3. The precipitate is partially soluble in aq. NH4OH solution.
Which of the following statement is incorrect-
We have two complexes, [Fe(H2O)6]2+ and [Cu(H2O)6]2+ , the magnetic properties respectively are
IUPAC name of complex compound [Pt(Br)2(PPh3)2].
Consider following statements.
S1: IUPAC name is IUPAC name is 4-chloro-1,3-dinitrobenzene
S2: IUPAC name is IUPAC name is 2-methylaniline

If the initial pressure of a gas is 0.03 atm, the mass of the gas adsorbed per gram of the adsorbent is ______ × 10–2 g.

2 g of a base whose equivalent weight is 40 reacts with 3g of an acid. The equivalent weight of the acid is:
In both DNA and RNA, heterocyclic base and phosphate ester linkages are at 
The number of isomeric forms that are represented by C7H9N is:
The products obtained when chlorine gas reacts with cold and dilute aqueous NaOH are:
Nitrogen has no d-orbital in its valence shell and therefore it cannot1) Exhibits the oxidation state of +52) Have covalency greater than 33) Exhibit orbital Hybridization4) Form oxides with oxidation states greater than +5Select the correct answer using codes given below:
Which one of the following species will disproportionate in the following reduction potential diagra