JEE Main 2021 (Online) 25th July Evening Shift

Maleic anhydride can prepared by :

[where \(Et \Rightarrow - {C_2}{H_5}{}^tBu \Rightarrow {(C{H_3})_3}C -\)]Consider the above reaction sequence, Product "A" and Product "B" formed respectively are :

The correct decreasing order of densities of the following compounds is :

Which among the following is the strongest acid ?

Which one of the following is correct structure for cytosine?

In the following the correct bond order sequence is :

Identify the species having one \(\pi\)-bond and maximum number of canonical forms from the following :

Assuming that Ba(OH)2 is completely ionised in aqueous solution under the given conditions the concentration of H3O+ ions in 0.005 M aqueous solution of Ba(OH)2 at 298 K is ______________ \(\times\) 10\(-\)12 mol L\(-\)1. (Nearest integer)

For a chemical reaction A \(\to\) B, it was found that concentration of B is increased by 0.2 mol L\(-\) in 30 min. The average rate of the reaction is ____________ \(\times\) 10\(-\)1 mol L\(-\)1 h\(-\)1. (in nearest integer)

Consider the above reaction, the product "P" is :

A reaction of benzonitrile with one equivalent CH3MgBr followed by hydrolysis produces a yellow liquid "P". The compound "P" will give positive _________.

What is the major product "P" of the following reaction?

Which one of the following metal complexes is most stable?

The spin only magnetic moments (in BM) for free Ti3+, V2+ and Sc3+ ions respectively are :(At.No. Sc : 21, Ti : 22, V : 23)

Which one of the following metals forms interstitial hydride easily?

Number of electrons present in 4f orbital of Ho3+ ion is ____________. (Given Atomic No. of Ho = 67)

Given below are two statements :Statement I : Chlorofluoro breakdown by radiation in the visible energy region and release chlorine gas in the atmosphere which then reacts with stratospheric ozone.Statement II : Atmospheric ozone reacts wit...

An LPG cylinder contains gas at a pressure of 300 kPa at 27\(^\circ\). The cylinder can withstand the pressure of 1.2 \(\times\) 106 Pa. The room in which the cylinder is kept catches fire. The minimum temperature at which the bursting of c...

Consider the above chemical reaction. The total number of stereoisomers possible for Product 'P' is _____________.

Match List I with List II : (Both having metallurgical terms)
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The ionic radii of F\(-\) and O2\(-\) respectively are 1.33\(\mathop A\limits^o\) and 1.4\(\mathop A\limits^o\), while the covalent radius of N is 0.74\(\mathop A\limits^o\).The correct statement for the ionic radius of N3\(-\) from the ...

A biodegradable polyamide can be made from :

0.8 g of an organic compound was analyzed by Kjeldahl's method for the estimation of nitrogen. If the percentage of nitrogen in the compound was found to be 42%, then ______________ mL of 1 M H2SO4 would have been neutralized by the ammonia...

Identify the process in which change in the oxidation state is five :

Match List I with List II :
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When 3.00 g of a substance 'X' is dissolved in 100 g of CCl4, it raises the boiling point by 0.60 K. The molar mass of the substance 'X' is ______________ g mol\(-\)1. (Nearest integer).[Given Kb for CCl4 is 5.0 K kg mol\(-\)1]

The number of significant figures in 0.00340 is ____________.

An accelerated electron has a speed of 5 \(\times\) 106 ms\(-\)1 with an uncertainty of 0.02%. The uncertainty in finding its location while in motion is x \(\times\) 10\(-\)9 m. The value of x is ____________. (Nearest integer)[Use mass of...

Match List I with List II :


List-IExample of colloids
List - IIClassification




(a) Cheese
(i) dispersion of liquid in liquid


(b) Pumice stone
(ii) dispersion of liquid in gas


(c) Hair cream...

A system does 200 J of work and at the same time absorbs 150 J of heat. The magnitude of the change in internal energy is ____________ J. (Nearest integer)