JEE Main 2021 (Online) 31st August Evening Shift

The structures A and B formed in the following reaction are : [Ph = \(-\)C6H5]

For the reaction given below :-The compound which is not formed as a product in the reaction is a :

Arrange the following conformational isomers of n-butane in order of their increasing potential energy :

Which of the following is not an example of fibrous protein?

According to molecular orbital theory, the number of unpaired electron(s) in \(O_2^{2 - }\) is :

For the reaction A \(\to\) B, the rate constant k(in s\(-\)1) is given by\({\log _{10}}k = 20.35 - {{(2.47 \times {{10}^3})} \over T}\)The energy of activation in kJ mol\(-\)1 is ____________. (Nearest integer) [Given : R = 8.314 J K\(-\)1 ...

The major products A and B formed in the following reaction sequence are :

Identify correct A, B and C in the reaction sequence given below :

Spin only magnetic moment in BM of [Fe(CO)4(C2O4)]+ is :

The Eu2+ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]

In which one of the following sets all species show disproportionation reaction?

The value of magnetic quantum number of the outermost electron of Zn+ ion is ______________.

Match List - I with List - II



List - I(Parmeter)

List - II(Unit)




(a)
Cell constant
(i)
\(S\,c{m^2}mo{l^{ - 1}}\)


(b)
Molar conductivity
(ii)
Dimensionless


(c)
...

The deposition of X and Y on ground surfaces is referred as wet and dry depositions, respectively. X and Y are :

The major product of the following reaction is :

For the following sequence of reactions, the correct
products are :

Which one of the following statements is incorrect?

The pH of a solution obtained by mixing 50 mL of 1 M HCl and 30 mL of 1 M NaOH is x \(\times\) 10\(-\)4. The value of x is ____________. (Nearest integer) [log 2.5 = 0.3979]

In the electrolytic refining of blister copper, the total number of main impurities, from the following, removed as anode mud is ______________Pb, Sb, Se, Te, Ru, Ag, Au and Pt

Which one of the following correctly represents the order of stability of oxides, X2O; (X = halogen)?

The number of S = O bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are :

Which among the following is not a polyester?

The transformation occurring in Duma's method is given below :\({C_2}{H_7}N + \left( {2x + {y \over 2}} \right)CuO \to xC{O_2} + {y \over 2}{H_2}O + {z \over 2}{N_2} + \left( {2x + {y \over 2}} \right)Cu\)The value of y is ______________. ...

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Lithium salts are hydrated.Reason (R) : Lithium has higher polarising power than other alkali metal group members.In ...

Match List - I with List - II :



List - I(Metal Ion)

List - II(Group of Qualitative analysis)




(a)
\(M{n^{2 + }}\)
(i)
Group - III


(b)
\(A{s^{3 + }}\)
(ii)
Group - IIA


...

The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the octahedral sites in AxB. The value of x is _____________. (Integer answer)

1.22 g of an organic acid is separately dissolved in 100 g of benzene (Kb = 2.6 K kg mol\(-\)1) and 100 g of acetone (Kb = 1.7 K kg mol\(-\)1). The acid is known to dimerize in benzene but remain as a monomer in acetone. The boiling point o...

Sodium oxide reacts with water to produce sodium hydroxide. 20.0 g of sodium oxide is dissolved in 500 mL of water. Neglecting the change in volume, the concentration of the resulting NaOH solution is ______________ \(\times\) 10\(-\)1 M. (...

CH4 is absorbed on 1g charcoal at 0\(^\circ\)C following the Freundlich adsorpiton isotherm 10.0 mL of CH4 is adsorbed at 100 mm of Hg, whereas 15.0 mL is adsorbed at 200 mm of Hg. The volume of CH4 adsorbed at 300 mm of Hg is 10x mL. The v...

The incorrect expression among the following is :