JEE Main 2021 (Online) 26th August Evening Shift

Which one of the following phenols does not give colour when condensed with phthalic anhydride in presence of conc. H2SO4 ?

Which one of the following compounds is not aromatic?

The number of stereoisomers possible for 1, 2-dimethyl cyclopropane is :

Given below are two statements : one is labelled as Assertion (A) and other is labelled as Reason (R). Assertion (A) : Sucrose is a disaccharide and a non-reducing sugar.Reason (R) : Sucrose involves glycosidic linkage between C1 of $$\beta...

The bond order and magnetic behaviour of \(O_2^ -\) ion are respectively :

The equilibrium constant Kc at 298 K for the reaction A + B \(\rightleftharpoons\) C + D is 100. Starting with an equimolar solution with concentrations of A, B, C and D all equal to 1M, the equilibrium concentration of D is ___________ $$\...

The reaction rate for the reaction[PtCl4]2\(-\) + H2O \(\rightleftharpoons\) [Pt(H2O)Cl3]\(-\) + Cl\(-\)was measured as a function of concentrations of different species. It was observed that $${{ - d\left[ {{{\left[ {PtC{l_4}} \right]}^{2 ...

The class of drug to which chlordiazepoxide with above structure belongs is :

Match List - I with List - II :Choose the most appropriate match :

The major product in the above reaction is :

Consider the given reaction, identify 'X' and 'Y' :

Indicate the complex/complex ion which did not show any geometrical isomerism :

Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value.Complexes : $$\mathop {{{[Co{F_6}]}^{3 - }}}\limits_A ,\mathop {{{[Co{{({H_2}O)}_6}]}^{2 + }}}\limits_B ,\mathop {{{[Co{{(N{H_...

The overall stability constant of the complex ion [Cu(NH3)4]2+ is 2.1 \(\times\) 1013. The overall dissociations constant is y \(\times\) 10\(-\)14. Then y is __________. (Nearest integer)

For the galvanic cell,Zn(s) + Cu2+ (0.02 M) \(\to\) Zn2+ (0.04 M) + Cu(s),Ecell = ______________ \(\times\) 10\(-\)2 V. (Nearest integer)[Use : \(E_{Cu/C{u^{2 + }}}^0\) = \(-\) 0.34 V, \(E_{Zn/Z{n^{2 + }}}^0\) = + 0.76 V, $${{2.303RT} \over...

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Photochemical smog causes cracking of rubber.Reason (R) : Presence of ozone, nitric oxide, acrolein, formaldehyde and...

The interaction energy of London forces between two particles is proportional to rx, where r is the distance between the particles. The value of x is :

Consider the given reaction, the product A is :

A chloro compound "A".(i) forms aldehydes on ozonolysis followed by the hydrolysis.(ii) when vaporized completely 1.53 g of A, gives 448 mL of vapour at STP.The number of carbon atoms in a molecule of compound A is ___________.

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : Heavy water is used for the study of reaction mechanism.Reason (R) : The rate of reaction for the cleavage of O - H bo...

Given below are two statements :Statement I : Sphalerite is a sulphide or of zinc and copper glance is a sulphide ore of copper.Statement II : It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using ...

The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of PCl5 is :

Chalcogen group elements are :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : Barium carbonate is insoluble in water and is highly stable.Reason (R) : The thermal stability of the carbonates incre...

In the sulphur estimation, 0.471 g of an organic compound gave 1.44 g of barium sulphate. The percentage of sulphur in the compound is ____________%. (Nearest integer)(Atomic Mass of Ba = 137 u)

83 g of ethylene glycol dissolved in 625 g of water. The freezing point of the solution is ____________ K. (Nearest integer)[Use : Molal Freezing point depression constant of water = 1.86 K kg mol\(-\)1]Freezing Point of water = 273 KAtomic...

100 mL of Na3PO4 solution contains 3.45 g of sodium. The molarity of the solution is _____________ \(\times\) 10\(-\)2 mol L\(-\)1. (Nearest integer)[Atomic Masses - Na : 23.0 u, O : 16.0 u, P : 31.0 u]

A metal surface is exposed to 500 nm radiation. The threshold frequency of the metal for photoelectric current is 4.3 \(\times\) 1014 Hz. The velocity of ejected electron is ____________ \(\times\) 105 ms\(-\)1 (Nearest integer)[Use : h = 6...

The sol given below with negatively charged colloidal particles is :

For water \(\Delta\)vap H = 41 kJ mol\(-\)1 at 373 K and 1 bar pressure. Assuming that water vapour is an ideal gas that occupies a much larger volume than liquid water, the internal energy change during evaporation of water is ___________ ...