JEE Main 2021 (Online) 24th February Evening Shift

Match List - I and List - II.
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Which of the following reagent is suitable for the preparation of the product in the above reaction?

Which one of the following carbonyl compounds cannot be prepared by addition of water on an alkyne in the presence of HgSO4 and H2SO4?

Which one of the following compounds is non-aromatic?

Match List - I and List - II.



List I

List II




(a)
Valium
(i)
Antifertility drug


(b)
Morphine
(ii)
Pernicious anaemia


(c)
Norethindrone
(iii)
Analgesic
...

The correct shape and \(I - I - I\) bond angles respectively in \(I_3^ -\) ion are :

The correct set from the following in which both pairs are in correct order of melting point is :

Sucrose hydrolyses in acid solution into glucose and fructose following first order rate law with a half-life of 3.33 h at 25\(^\circ\)C. After 9 h, the fraction of sucrose remaining is f. The value of $${\log _{10}}\left( {{1 \over f}} \ri...

What is the correct sequence of reagents used for converting nitrobenzene into m-dibromobenzene?

The diazonium salt of which of the following compounds will form a coloured dye on reaction with \(\beta\)-Naphthol in NaOH?

The total number of amines among the following which can be synthesized by Gabriel synthesis is __________.

The calculated magnetic moments (spin only value) for species \({[FeC{l_4}]^{2 - }}\), \({[Co{({C_2}{O_4})_3}]^{3 - }}\) and \(MnO_4^{2 - }\) respectively are :

What is the correct order of the following elements with respect to their density?

The incorrect statement among the following is :

The magnitude of the change in oxidising power of the \(MnO_4^ - /M{n^{2 + }}\) couple is x \(\times\) 10\(-\)4 V, if the H+ concentration is decreased from 1M to 10\(-\)4 M at 25\(^\circ\)C. (Assume concentration of \(MnO_4^ -\) and $$M{n...

Given below are two statements :Statement I : The value of the parameter "Biochemical Oxygen Demand (BOD)" is important for survival of aquatic life.Statement II : The optimum value of BOD is 6.5 ppm.In the light of the above statements, ch...

The volume occupied by 4.75 g of acetylene gas at 50\(^\circ\)C and 740 mmHg pressure is __________ L. (Rounded off to the nearest integer)[Given R = 0.0826 L atm K\(-\)1 mol\(-\)1]

The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is :

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.Assertion A : Hydrogen is the most abundant element in the Universe, but it is not the most abundant gas in the troposphere.Reason R : Hyd...

The solubility product of PbI2 is 8.0 \(\times\) 10\(-\)9. The solubility of lead iodide in 0.1 molar solution of lead nitrate is x \(\times\) 10\(-\)6. mol/L. The value of x is __________. (Rounded off to the nearest integer) [Given $$\sqr...

Math List - I with List - II.



List I (Metal)

List II (Ores)




(a)
Aluminium
(i)
Siderite


(b)
Iron
(ii)
Calamine


(c)
Copper
(iii)
Kaolinite


(d)...

Among the following allotropic forms of sulphur, the number of allotropic forms, which will show paramagnetism is _________.(A) \(\alpha\)-sulphur(B) \(\beta\)-sulphur(C) S2-form

In polymer Buna-S : 'S' stands for :

Match List - I with List - II.



List I (Salt)

List II (Flame colour wavelength)




(a)
LiCl
(i)
455.5 nm


(b)
NaCl
(ii)
670.8 nm


(c)
RbCl
(iii)
780.0 nm
...

C6H6 freezes at 5.5\(^\circ\)C. The temperature at which a solution of 10g of C4H10 in 200g of C6H6 freeze is __________ \(^\circ\)C. (The molal freezing point depression constant of C6H6 is 5.12\(^\circ\)C/m.)

1.86 g of aniline completely reacts to form acetanilide. 10% of the product is lost during purification. Amount of acetanilide obtained after purification (in g) is __________ \(\times\) 10\(-\)2.

The formula of a gaseous hydrocarbon which requires 6 times of its own volume of O2 for complete oxidation and produces 4 times its own volume of CO2 is CxHy. The value of y is _____________.

According to Bohr's atomic theory :(A) Kinetic energy of electron is \(\propto {{{Z^2}} \over {{n^2}}}\).(B) The product of velocity (v) of electron and principal quantum number (n), \('vn' \propto {Z^2}\).(C) Frequency of revolution of el...

Most suitable salt which can be used for efficient clotting of blood will be :

Assuming ideal behaviour, the magnitude of log K for the following reaction at 25\(^\circ\)C is x \(\times\) 10\(-\)1. The value of x is ______________. (Integer answer)
\(3HC \equiv C{H_{(g)}} \rightleftharpoons {C_6}{H_{6(l)}}\)
[Given : ...