List of top Chemistry Questions asked in JEE Main

If the radius of ground state hydrogen is 51 pm, find out the radius of 5th orbit of Li²⁺ ions. (closest integer)

Reaction of thionyl chloride with white phosphorus forms a compound [A], which on hydrolysis gives [B], a dibasic acid $[ A ]$ and $[ B ]$ are respectively

The value of $log_{10}K$ for a reaction A ⇋ B is

(Given,

$\Delta H^{\circ}_{298K}$ = –54.67 kJ $mol^{-1}$

$\Delta H^{\circ}_{298K}$ = 10 kJ $mol^{-1}$

and R = 8.314 J $K^{-1}mol^{-1}$

2.303 × 8.314 × 298 = 5705)

How many bromo products are formed when ethane is reacted with excess of Br₂ on heating?

Polymer which is named as orlon is:

Photochemical smog found mainly in

Product (P) and (Q) are respectively

Match the following with the correct name of reaction

Determine the amount of urea (NH₂CONH₂) to be added in 1000 g of water to decrease its vapour pressure by 25%.

Number of ambidentate ligands in given complex [M_(en)(SCN)₄]:

Reaction of $BeO$ with ammonia and hydrogen fluoride gives A which on thermal decomposition gives $BeF _2$ and $NH _4 F$ What is ' $A ^{\prime}$ ?

Which of the following reaction is correct?

Oxidation number of Mo in Ammonophosphomolybdate

Some reactions of $NO _2$ relevant to photochemical smog formation are

photochemical smog formation

Identify $A , B , X$ and $Y$

' $A$' and ' $B$ ' formed in the following set of reactions are:

Which will undergo deprotonation most readily in basic medium?

Identify the product formed (A and E)

Inert gases have positive electron gain enthalpy Its correct order is

Match items of Row I with those of Row II:

[(i)] $\alpha$-D-(-)-Fructofuranose
[(ii)] $\beta$-D-(-)-Fructofuranose
[(iii)] $\alpha$-D-(+)-Glucopyranose
[(iv)] $\beta$-D-(+)-Glucopyranose
Correct Match:

'R formed in the following sequence of reactions is :

Match the List-I with List-II :

List I Cations A→Pb2+,Cu2+ B→Al3+,Fe3+ C→Co2+,Ni2+ D→Ba2+,Ca2+ List II Group reagent i.H2S gas in presence of dilute HCl ii. (NH4)2CO3 in presence

Compound $( X )$ undergoes following sequence of reactions to give the Lactone $( Y )$

In the following given reaction, ' $A$ ' is

In the cumene to phenol preparation in presence of air, the intermediate is

Match List I with List II

LIST I Elements		LIST II Colour imparted to the flame
A	K	1	Brick Red
B	Ca	2	Violet
C	Sr	3	Apple Green
D	Ba	4	Crimson Red

Choose the correct answer from the options given below:

Reaction	Name of reaction
(I)	(P)	Gattermann Koch reaction
(II)	(Q)	Hell Volhard Zelinsky
(III)	(R)	Iodoform reaction