List of top Chemistry Questions asked in JEE Main

During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will favour the reaction.

See the following chemical reaction: \[ \text{Cr}_2\text{O}_7^{2-} + \text{XH}^+ + \text{6Fe}^{2+} \rightarrow \text{YCr}^{3+} + \text{6Fe}^{3+} + \text{ZH}_2\text{O}. \] The sum of $X$, $Y$, and $Z$ is _____.

Consider the following reaction sequence: $[CaCl_2 + Na_2CO_3 → X+Y] → Z$

$H_2O_2$ behave like reducing agent in which of the following reactions:

Match List I with List II

Choose the correct answer from the options given below:

Which of the following represents the correct order of metallic character of the given elements?

Match List I with List II

LIST I		LIST II
A	Chlorophyll	1	$Na _2 CO _3$
B	Soda ash	2	$CaSO _4$
C	Dentistry, Ornamental work	3	$Mg ^{2+}$
D	Used in white washing	4	$Ca ( OH )_2$

Compound A reacts with $NH _4 Cl$ and forms a compound B Compound B reacts with $H _2 O$ and excess of $CO _2$ to form compound $C$ which on passing through or reaction with saturated $NaCl$ solution forms sodium hydrogen carbonate Compound $A , B$ and $C$, are respectively

Which one among the following metals is the weakest reducing agent?

Compound A reacts with $NH _4 Cl$ and forms a compound B.

Compound B reacts with $H _2 O$ and excess of $CO _2$ to form compound $C$ which on passing through or reaction with saturated $NaCl$ solution forms sodium hydrogen carbonate Compound $A , B$ and $C$, are respectively.

Sum of $\pi$-bonds present in peroxodisulphuric acid and pyrosulphuric acid is___________

The total number of acidic oxides from the following list is: $NO , N _2 O , B _2 O _3, N _2 O _5$, $CO , SO _3, P _4 O _{10}$

Match List I with List II

LIST I		LIST II
A	X_eF₄	I	See-saw
B	SF₄	II	Square planar
C	NH₄+	III	Bent T-shaped
D	BrF₃	IV	Tetrahedral

Choose the correct answer from the options given below :

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

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XeF$_4$ reacts with SbF$_5$ to form:
\[ [\text{XeF}_m]^{n+}[\text{SbF}_y]^{z-} \] What is $m+n+y+z$?

If the formula of borax is $Na_2B_4Ox(OH)y.zH_2O$ , Find the value of x + y + z.

How many of the following have five radial nodes ?
5s, 6s, 7s, 6p and 4p

In good quality cement ratio of lime total oxides of Si(SiO$_2$), Aluminium(Al$_2$O$_3$) and Iron(Fe$_2$O$_3$) should be as close as possible to _____ .

Which one among the following metals is the weakest reducing agent?

For compound having the formula GaCl$_3$, the correct option from the following is:

The correct order in aqueous medium of basic strength in case of methyl substituted amines is :

How many of the transformations given below would result in aromatic amines?

Given below are two statements:
Statement I : Pure Aniline and other arylamines are usually colourless.
Statement II : Arylamines get coloured on storage due to atmospheric reduction.
Choose the correct answer

Match List I with List II

LIST I (Amines)		LIST II (pKb)
A	Aniline	I	3.25
B	Ethanamine	II	3.00
C	N-Ethylethanamine	III	9.38
D	N, N-Diethylethanamine	IV	3.29

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