List of top Chemistry Questions asked in JEE Main

At 310 K, the solubility of CaF2 in water is 2.34 ×10–3 g/100 mL. The solubility product of CaF2 is _____ × 10–8 (mol/L)3.
(Given molar mass : CaF2 = 78 g mol–1).
A flask is filled with equal moles of A and B. The half lives of A and B are 100 s and 50 s respectively and are independent of the initial concentration. The time required for the concentration of A to be four times that of B is ________s.
(Given : In 2 = 0.693)
Number of electron deficient molecules among the following
\(PH_3, B_2H_6, CCl_4, NH_3, LiH \) and \(BCl_3\) is
A \(100\) \(mL\) solution of \(CH_3CH_2MgBr\) on treatment with methanol produces \(2.24\) \(mL\) of a gas at STP. The weight of gas produced is_____ mg. [nearest integer]
Geraniol, a volatile organic compound, is a component of rose oil. The density of the vapour is 0.46 gL–1 at 257°C and 100 mm Hg. The molar mass of geraniol is ____ g mol –1. (Nearest Integer) [Given: R = 0.082 L atm K–1 mol–1]
Given below are two statements :
Statement I: Maltose has two\(α-D-glucose\) units linked at \(C_1\) and \(C_4\) and is a reducing sugar.
Statement II: Maltose has two monosaccharides : 
\(α-D-glucose\) and \(β-D-glucose\) linked at \(C_1\) and \(C_6\) and it is a non-reducing sugar.
In the light of the above statements, choose the correct answer from the options given below.
Polar stratospheric clouds facilitate the formation of:
Match List I with List II. 
 List-I List-II
A.
I.Br2 in CS2
B.
II.Na2CR2O7/H2SO4
C.
III.Zn
D.
IV.CHCl3/NaOH

Choose the correct answer from the options given below:
The formula of the purple colour formed in Laissaigne’s test for sulphur using sodium nitroprusside is
Which of the following structures are aromatic in nature?
Which of the following structures are aromatic in nature
0.25 g of an organic compound containing chlorine gave 0.40 g of silver chloride in Carius estimation. The percentage of chlorine present in the compound is ______. [in nearest integer]
(Given : Molar mass of \(Ag\) is 108 g mol–1 and that of \(Cl\) is 35.5 g mol–1
Fig. 













If the initial pressure of a gas 0.03 atm, the mass of the gas absorbed per gram of the adsorbent is ____× 10–2g

For combustion of one mole of magnesium in an open container at 300K and 1bar pressure, ΔCHΘ=–601.70kJ mol–1, the magnitude of change in internal energy for the reaction is______ kJ. (Nearest integer) (Given : R = 8.3 J K–1 mol–1)
The correct order of increasing ionic radii is
The number of chiral alcohol(s) with molecular formula C4H10O is ____.
Which of the following compound does not contain sulphur atom?
In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?
Which of the following is most stable?

Using the rules for significant figures, the correct answer for the expression
\(\frac{0.02858 × 0.112}{ 0.5702}\)
will be

The \(\left(\frac{\partial E}{\partial T}\right)_p\) of different types of half cells are as follows:
ABCD
1 × 10-42 × 10-40.1 × 10-40.2 × 10-4

(Where E is the electromotive force)
Which of the above half cells would be preferred to be used as reference electrode?

A solution containing 2.5 × 10–3 kg of a solute dissolved in 75 × 10–3 kg of water boils at 373.535 K. The molar mass of the solute is _____ g mol–1. [nearest integer] (Given : Kb(H2O) = 0.52 K kg mol–1 and boiling point of water = 373.15 K)
The cell potential for \(\text{Zn}|\text{Zn}^{2+}\text{(aq)}||\text{Sn}^{x+}|\text{Sn}\) is 0.801 V at 298 K.The reaction quotient for the above reaction is 10–2. The number of electrons involved in the given electrochemical cell reaction is _____. (Given: \(Eº_Zn^{2+}\)|Zn=-0.763V,Eºsnx+|sn=+0.008V and 2.303RT/F=0.06V)

A student needs to prepare a buffer solution of propanoic acid and its sodium salt with pH 4. The ratio of 
\(\frac{[CH_3CH_2COO^−]}{[CH_3CH_2COOH] }\)
required to make buffer is _____.
Given : Ka(CH3CH2COOH) = 1.3 × 10–5

Compound ‘P’ on nitration with dil. HNO3 yields two isomers (A) and (B) show the intramolecular and intermolecular hydrogen bonding respectively. Compound (P) on reaction with conc. HNO3 yields a yellow compound ‘C’, a strong acid. The number of oxygen atoms is present in compound ‘C’ _____
L-isomer of a compound ‘A’ \((C_4H_8O_4)\) gives a positive test with \([Ag(NH_3)^2]^+\). Treatment of ‘A’ with acetic anhydride yields triacetate derivative. Compound ‘A’ produces an optically active compound (B) and an optically inactive compound (C) on treatment with bromine water and \(HNO_3\) respectively. Compound (A) is: