List of top Questions asked in JEE Main- 2023

Lithium aluminium hydride can be prepared from the reaction of

Which of the following compounds would give the following set of qualitative analysis?

  1. Fehling's Test: Positive
  2. Na fusion extract upon treatment with sodium nitroprusside gives a blood-red colour but not prussian blue
During the qualitative analysis of $SO _3^2$ using dilute $H _2 SO _4, SO _2$ gas is evolved which turns $K _2 Cr _2 O _7$ solution (acidified with dilute $H _2 SO _4$ ) :
What is the correct order of acidity of the protons marked A-D in the given compounds?
What is the correct order of acidity
Formation of photochemical smog involves the following reaction in which $A , B$ and $C$ are respectively i $NO _2 \xrightarrow{ h\nu } A + B$ ii $B + O _2 \rightarrow C$ iii $A + C \rightarrow NO _2+ O _2$ Choose the correct answer from the options given below:
Amongst the following compounds, which one is an antacid?
Caprolactam when heated at high temperature in presence of water, gives
Which of the following is correct order of ligand field strength?

Match List I with List II 
Molecules/Ions
Choose the correct answer from the options given below:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): Ketoses give Seliwanoff's test faster than Aldoses
Reason (R): Ketoses undergo -elimination followed by formation of furfural
In the light of the above statements, choose the correct answer from the options given below:

Benzyl isocyanide can be obtained by : Choose the correct answer from the options given below :

In the extraction of copper, its sulphide ore is heated in a reverberatory furnace after mixing with silica to:

Match List I with List II 

List IList II
AIFittig reaction
BIIWurtz Fittig reaction
CIIIFinkelstein reaction
D\(C_{2}H_{5}CI + NaI \rightarrow C_{2}H_{5}I + NaCl\)IVSandmeyer reaction

 Choose the correct answer from the options given below:

To inhibit the growth of tumours, identify the compounds used from the following : A EDTA B Coordination Compounds of Pt C D-Penicillamine D Cis - Platin Choose the correct answer from the option given below:

Match List -I with List-II

LIST-I (Atomic number)LIST-II (Block of periodic table)
(A) 37 (K)I. p-block
(B) 78 (Pt)II. d-block
(C) 52 (Te)III. f-block
(D) 65 (Tb)IV. s-block

Choose the correct answer from the options given below:

If the coefficient of $x^{15}$ in the expansion of $\left(a x^3+\frac{1}{b x^{1 / 3}}\right)^{15}$ is equal to the coefficient of $x^{-15}$ in the expansion of $\left(a x^{1 / 3}-\frac{1}{b x^3}\right)^{15}$, where a and $b$ are positive real numbers, then for each such ordered pair $(a, b)$ :

The number of points on the curve \(y=54 x^5-135 x^4-70 x^3+180 x^2+210 x\) at which the normal lines are parallel \(to x+90 y+2=0\) is 

If $\tan 15^{\circ}+\frac{1}{\tan 75^{\circ}}+\frac{1}{\tan 105^{\circ}}+\tan 195^{\circ}=2 a$, then the value of $\left(a+\frac{1}{a}\right)$ is :
If $[ t ]$ denotes the greatest integer $\leq t$, then the value of $\frac{3( e -1)}{ e } \int\limits_1^2 x^2 e^{[x]+\left[x^3\right]} dx$ is :
Let $y=x+2,4 y=3 x+6$ and $3 y=4 x+1$ be three tangent lines to the circle $(x-h)^2+(y- k )^2= r ^2$ Then $h + k$ is equal to :
If an unbiased die, marked with $-2,-1,0,1,2,3$ on its faces, is thrown five times, then the probability that the product of the outcomes is positive, is:
The coefficient of $x^{301}$ in $(1+x)^{500}+x(1+x)^{499}+x^2(1+x)^{498}+\ldots \ldots +x^{500}$ is :
If $a_n=\frac{-2}{4 n^2-16 n+15}$, then $a_1+a_2+\ldots \ldots+a_{25}$ is equal to:
The minimum number of elements that must be added to the relation $R=\{(a, b),(b, c)\}$ on the set $\{ a , b , c \}$ so that it becomes symmetric and transitive is :
If $P ( h , k )$ be a point on the parabola $x=4 y^2$, which is nearest to the point $Q (0,33)$, then the distance of $P$ from the directrix of the parabola $y^2=4(x+y)$ is equal to :