List of top Chemistry Questions asked in JEE Main

Match List - I with List - II 
 

List-I (Processes/Reactions)		List-II (Catalyst)
A	$2 SO _2( g )+ O _2( g ) \rightarrow 2 SO _3( g )$	I	$Fe ( s )$
B	$4 NH _3( g )+5 O _2( g ) \rightarrow$$4 NO ( g )+6 H _2 O ( g )$	II	$Pt ( s )- Rh ( s )$
C	$N _2( g )+3 H _2( g ) \rightarrow 2 NH _3( g )$	III	$V _2 O _5$
D	Vegetable oil $(l)+ H _2 \rightarrow$Vegetable ghee(s	IV	$Ni ( s )$

Choose the correct answer from the options given below:

Given two statements below: 
Statement I: In $Cl _2$ molecule the covalent radius is double of the atomic radius of chlorine. 
Statement II: Radius of anionic species is always greater than their parent atomic radius Choose the most appropriate answer from options given below:

Match List-I with List-II, match the gas evolved during each reaction:
 

List-I		List-II
(A)	$\left( NH _4\right)_2 Cr _2 O _7 \xrightarrow{\Delta}$	(I)	$H _2$
(B)	$KMnO _4+ HCl \rightarrow$	(II)	$N _2$
(C)	$Al + NaOH + H _2 O \rightarrow$	(III)	$O _2$
(D)	$NaNO _3 \xrightarrow{\Delta}$	(IV)	$Cl _2$

Choose the correct answer from the options given below:

Which reactant will give the following alcohol on reaction with one mole of phenyl magnesium bromide \(( PhMgBr )\) followed by acidic hydrolysis?

Match List-I with List-II
 

List-I		List-II
(A)	Cd(s)+2Ni(OH)3(s)→CdO(s)+2Ni(OH)2(s)+H2O(l)	(I)	Primary battery
(B)	Zn(Hg)+HgO(s)→ZnO(s)+Hg(l)	(II)	Discharging of secondary battery
(C)	2PbSO4(s)+2H2O(l)→Pb(s)+PbO2(s)+2H2SO4(aq)	(III)	Fuel cell
(D)	2H2(g)+O2(g)→2H2O(l)	(IV)	Charging of secondary battery

Choose the correct answer from the options given below:

Identify the correct statement for the below given transformation

Choose the correct option for the following reactions

Statements about Enzyme Inhibitor Drugs are given below:

1. There are Competitive and Noncompetitive inhibitor drugs
2.  These can bind at the active sites and allosteric sites
3.  Competitive Drugs are allosteric site blocking drugs
4.  Non-competitive Drugs are active site blocking drugs 

Choose the correct answer from the options given below :

Terylene polymer is obtained by condensation of :

For kinetic study of the reaction of iodide ion with \(H _2 O _2\) at room temperature : 
(A) Always use freshly prepared starch solution 
(B) Always keep the concentration of sodium thiosulphate solution less than that of \(KI\) solution 
(C) Record the time immediately after the appearance of blue colour 
(D) Record the time immediately before the appearance of blue colour 
(E) Always keep the concentration of sodium thiosulphate solution more than that of \(KI\) solution Choose the correct answer from the options given below :

Match List-I with List-II

The metal salts formed during softening of hardwater using Clark's method are :

Stearic acid and polyethylene glycol react to form which one of the following soaps/detergents ?

The correct stability order of the following diazonium salt is

Drugs used to bind to receptors, inhibiting its natural function and blocking a message are called :

Given below are two statements : Statement I : On heating with \(KHSO _4\), glycerol is dehydrated and acrolein is formed 
Statement II : Acrolein has fruity odour and can be used to test glycerol's presence Choose the correct option

Refining using liquation method is the most suitable for metals with :

Which of the following can be used to prevent the decomposition of $H _2 O _2$ ?

Reaction of \(BeCl _2\) with \(LiAlH _4\) gives: Choose the correct answer from options given below : 

1. \(AlCl _3\)
2. \(BeH _2\)
3. \(LiH\)
4. \(LiCl\)
5. \(BeAlH _4\)
    

Borazine, also known as inorganic benzene, can be prepared by the reaction of 3-equivalents of "$X$" with 6-equivalents of "Y". "X" and "Y", respectively are :

The difference in the reaction of phenol with bromine in chloroform and bromine in water medium is due to :

Which technique among the following, is most appropriate in separation of a mixture of $100\, mg$ of $p$-nitrophenol and picric acid ?

$\dot{ C } l + CH _4 \rightarrow A + B$. $A$ and $B$ in the above atmospheric reaction step are

The dark purple colour of $KMnO _4$ disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation number of manganese in the reaction is :

During the denaturation of proteins, which of these structures will remain intact ?