List of top Chemistry Questions asked in JEE Main

Identify the incorrect option from the following:
Conversion of compound (X) to product (Y)
In the above conversion of compound $( X )$ to product $( Y )$, the sequence of reagents to be used will be:
The spin-only magnetic moment value of $M ^{3+}$ ion (in gaseous state) from the pairs $Cr ^{3+} / Cr ^{2+}, Mn ^{3+} / Mn ^2, \quad Fe ^{3+} / Fe ^{2+}$ and $Co ^{3+} / Co ^{2+}$ that has negative standard electrode potential, is BM [Nearest integer]
When $Cu ^{2+}$ ion is treated with $KI$, a white precipitate, $X$ appears in solution The solution is titrated with sodium thiosulphate, the compound $Y$ is formed $X$ and $Y$ respectively are
The number of alkali metal(s), from Li, K, Cs, $Rb$ having ionization enthalpy greater than $400\, kJ$ $mol ^{-1}$ and forming stable super oxide is
For a metal ion, the calculated magnetic moment is 4.90 BM. This metal ion has ______ number of unpaired electrons.
The element playing significant role in neuromuscular function and interneuronal transmission is :
Consider the reaction \(Cu^{2+} + X^- → Cu_2X_2 + X_2\).
X2 will be predominantly?
Chlorides of which metal are soluble in organic solvents:
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): $Cu ^{2+}$ in water is more stable than $Cu ^{+}$
Reason (R): Enthalpy of hydration for $Cu ^{2+}$ is much less than that of $Cu ^{+}$ 
In the light of the above statements, choose the correct answer from the options given below :

Match List I with List II :
 

List-I (molecule)List-II (hybridization; shape)
AXeO3​isp3d ; linear
BXeF2​iisp3; pyramidal
CXeOF4​iiisp3d3; distorted octahedral
DXeF6​ivsp3d2 ;square pyramidal


Choose the correct answer from the options given below:

Match List I with List II.
 

List-IList-II
ASulphateIPesticide
BFluorideIIBending of bones
CNicotineIIILaxative effect
DSodium arsiniteIVHerbicide


Choose the correct answer from the options given below:

 

Order of Covalent bond:
A. $KF > KI ; LiF > KF$ 
B. $KF < KI ; LiF > KF$ 
C. $SnCl _4> SnCl _2 ; CuCl > NaCl$ 
D. $LiF > KF ; CuCl <NaCl$
E. $KF < KI ; CuCl > NaCl$ 
Choose the correct answer from the options given below:
Which of the following have square pyramidal structure?
How many factors will contribute to a major role in covalent character of a compound.
  1. Polarising power of cation
  2. Polarisability of the anion
  3. Distortion caused by cation
  4. Polarisability of cation
Compounds of Xenon have one electron pain on central atom:

Which of the following has maximum number of l.p. at central atom?

The geometry around boron in the product 'B' formed from the following reaction is $ BF _3+ NaH \xrightarrow{450 K } A + NaF$ $ A + NMe _3 \rightarrow B$

Red ppt. by Benedict solution is?

Glycosidic linkage between $C _1$ of $\alpha$-glucose and $C_2$ of $\beta$-fructose is found in

We are given some diseases in Column II. Column-I contains name of some vitamins and their deficiencies will cause: 

Column-I

Column-II

(A)Vitamin A(p)Scurvy
(B)Vitamin B2(q)Xerophthalmia
(C)Vitamin B1 (Thiamine)(r)Cheilosis
(D)Vitamin C(s)Beri Beri
One which does not stabilize secondary and tertiary protein?
Match the terms in Column-I with their description in Column-II and choose the correct option :
Column IColumn II
(i)Vitamin AaBeri-beri
(ii)Vitamin C (Ascorbic acid)bCheilosis
(iii)RiboflavincXerophthalmia
(iv)ThiaminedScurvy
How many of the following- amino acids contain sulphur?
Lysine; Methionine; Glutamic acid; Threonine 
Arginine; Cysteine; Tyrosine; Isoleucine
A chloride salt solution acidified with dil $HNO _3$ gives a curdy white precipitate, $[A]$, on addition of $AgNO _3 - [A]$ on treatment with $NH _4 OH$ gives a clear solution, $B$$A$ and $B$ are respectively