List of top Chemistry Questions asked in JEE Main

600 mL of 0.04 M HCl is mixed with 400 mL of 0.02 M H₂SO₄. Find out the pH of resulting solution (Nearest integer).

When $Fe _{0.93} O$ is heated in presence of oxygen, it converts to $Fe _2 O _3$ The number of correct statement/s from the following is
A. The equivalent weight of $Fe _{093} O$ is Molecular wejght $0.79$
B. The number of moles of $Fe ^{2+}$ and $Fe ^{3+}$ in 1 mole of $Fe _{0.93} O$ is $0.79$ and $014$ respectively
C. $Fe _{0.93} O$ is metal deficient with lattice comprising of cubic closed packed arrangement of $O ^{2-}$ ions
D. The $\%$ composition of $Fe ^{2+}$ and $Fe ^{3+}$ in $Fe _{093} O$ is $85 \%$ and $15 \%$ respectively

The dissociation constant of acetic acid is $x \times 10^{-5}$ When $25 \,mL$ of $0.2 \,M \,CH _3 COONa$ solution is mixed with $25 \,mL$ of $0.02\, M \,CH _3 COOH$ solution, the $pH$ of the resultant solution is found to be equal to 5. The value of $x$ is ___

Match List I with List II:

Decreasing order of the hydrogen bonding in following forms of water is correctly represented by
A. Liquid water
B. Ice
C. Impure water
Choose the correct answer from the options given below:

Lithium aluminium hydride can be prepared from the reaction of:

Statement I: For colloidal particles, the values of colligative properties are of small order as compared to values shown by true solutions at the same concentration
Statement II: For colloidal particles, the potential difference between the fixed layer and the diffused layer of the same charges is called the electrokinetic potential or zeta potential
In the light of the above statements, choose the correct answer from the options given below

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	$Ca ( OH )_2$

An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime The metal ion is:

The primary and secondary valencies of cobalt respectively in $[ Co(NH_3)_5Cl]Cl_2$ are :

It is observed that characteristic $X$-ray spectra of elements show regularity When frequency to the power " $n$ " ie $v^n$ of $X$-rays emitted is plotted against atomic number " $Z$ ", following graph is obtained

Increasing order of stability of the resonance structures is:

Choose the correct answer from the options given below:

The magnetic moment of a transition metal compound has been calculated to be 3.87 B.M. The metal ion is

Chiral complex from the following is

Decreasing order of dehydration of the following alcohols is

A → B The above reaction is of zero order Half life of this reaction is 50 min The time taken for the concentration of A to reduce to one-fourth of its initial value is ____ min (Nearest integer)

$5 \,g$ of $NaOH$ was dissolved in deionized water to prepare a $450 \,mL$ stock solution What volume (in $mL$ ) of this solution would be required to prepare $500 \,mL$ of $01\, M$ solution? Given: Molar Mass of $Na, O$ and $H$ is 23,16 and $1 \,g\, mol ^{-1}$ respectively

Given below are two statements:

Statement I