JEE Main 2021 (Online) 18th March Evening Shift

In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula [Ag(NH3)2]+ per aldehyde group to form silver mirror is ___________. (Round off to the Nearest Integer).

Consider the above reaction, the product 'X' and 'Y' respectively are :

Consider the above reaction where 6.1 g of Benzoic acid is used to get 7.8 g of m-bromo benzoic acid. The percentage yield of the product is __________(Round off to the Nearest Integer).[Given : Atomic masses : C : 12.0 u, H : 1.0 u, O : 16...

In the following molecule,Hybridisation of Carbon a, b, and c respectively are :

Deficiency of vitamin K causes :

The number of species below that have two lone pairs of electrons in their central atom is _________. (Round off to the Nearest Integer).SF4, BF\(_4^ -\), ClF3, AsF3, PCl5, BrF5, XeF4, SF6

The gas phase reaction \(2A(g) \rightleftharpoons {A_2}(g)\) at 400 K has \(\Delta\)Go = + 25.2 kJ mol-1.The equilibrium constant KC for this reaction is ________ \(\times\) 10\(-\)2. (Round off to the Nearest Integer).[Use : R = 8.3 J mol$...

A reaction has a half life of 1 min. The time required for 99.9% completion of the reaction is _________ min. (Round off to the Nearest Integer). [Use : ln 2 = 0.69; ln 10 = 2.3]

Match List - I with List - II :



List - I(Class of Chemicals)

List - II(Example)




(a)
Antifertility drug
(i)
Meprobamate


(b)
Antibiotic
(ii)
Alitame


(c)
Tranqui...

An organic compound "A" on treatment with benzene sulphonyl chloride gives compound B. B is soluble in dil. NaOH solution. Compound A is :

Consider the given reaction, percentage yield of :

In the reaction of hypobromite with amide, the carbonyl carbon is lost as :

The secondary valency and the number of hydrogen bonded water molecule(s) in CuSO4 . 5H2O, respectively, are :

The oxide that shows magnetic property is :

The molar conductivities at infinite dilution of barium chloride, sulphuric acid and hydrochloric acid are 280, 860 and 426 S cm2 mol\(-\)1 respectively. The molar conductivity at infinite dilution of barium sulphate is _________ S cm2 mol$...

Given below are two statements :Statement I : Non-biodegradable wastes are generated by the thermal power plants.Statement II : Bio-degradable detergents leads to eutrophication.In the light of the above statements, choose the most appropri...

Main products formed during a reaction of 1-methoxy naphthalene with hydroiodic acid are :

Given below are two statements :Statement I : C2H5OH and AgCN both can generate nucleophile.Statement II : KCN and AgCN both will generate nitrile nucleophile with all reaction conditions.Choose the most appropriate option :

In basic medium, H2O2 exhibits which of the following reactions?(A) Mn2+ \(\to\) Mn4+(B) I2 \(\to\) I\(-\)(C) PbS \(\to\) PbSO4Choose the most appropriate answer from the options given below :

The solubility of CdSO4 in water is 8.0 \(\times\) 10\(-\)4 mol L\(-\)1. Its solubility in 0.01 M H2SO4 solution is __________ \(\times\) 10\(-\)6 mol L\(-\)1. (Round off to the Nearest Integer). (Assume that solubility is much less than 0....

Match List - I with List - II :



List - I

List - II




(a)
Mercury
(i)
Vapour phase refining


(b)
Copper
(ii)
Distillation refining


(c)
Silicon
(iii)
Elect...

A xenon compound 'A' upon partial hydrolysis gives XeO2F2. The number of lone pair of electrons present in compound A is _________. (Round off to the Nearest Integer)

The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. The elements X, Y and Z, respectively, are :

The oxidation states of nitrogen in NO, NO2, N2O and NO\(_3^ -\) are in the order of :

Match List - I with List - II :



List - I

List - II




(a)
Be
(i)
treatment of cancer


(b)
Mg
(ii)
extraction of metals


(c)
Ca
(iii)
incendiary bombs and s...

A hard substance melts at high temperature and is an insulator in both solid and in molten state. This solid is most likely to be a/an :

A solute A dimerizes in water. The boiling point of a 2 molal solution of A is 100.52\(^\circ\)C. The percentage association of A is __________. (Round off to the Nearest Integer).[Use : Kb for water = 0.52 K kg mol\(-\)1 Boiling point of w...

10.0 mL of Na2CO3 solution is titrated against 0.2 M HCl solution. The following titre values were obtained in 5 readings :4.8 mL, 4.9 mL, 5.0 mL, 5.0 mL and 5.0 mLBased on these readings, and convention of titrimetric estimation the concen...

Given below are two statements :Statement I : Bohr's theory accounts for the stability and line spectrum of Li+ ion.Statement II : Bohr's theory was unable to explain the splitting of spectral lines in the presence of a magnetic field.In th...

The charges on the colloidal CdS sol and TiO2 sol are, respectively :