List of top Chemistry Questions asked in JEE Main

Correct order of first ionization energy of Li, Be, C, B, N, O, F


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How many moles of \(Ba_3(PO_4)_2\) will be formed by the reaction of \(5\) moles of \(BaCl_2\) and \(3\) moles of \(Na_3(PO_4)\).
How many bromo products are formed when ethane is reacted with excess of \(Br_2\) on heating?

Assertion (A) : Radius of H+ is 1.5 × 10–3 pm.
Reason (R) : H+ cannot exist independently.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
A ⇒ Spin only magnetic moment of [Fe(CN)6]–3 is 1.73 B.M. and [Fe(H2O)6]+3 is 5.92 B.M.
R ⇒ In both cases Fe have +3 oxidation state
In the light of the above statements, write the detailed answer:
Given below are two statement: one is labelled as Assertion (A) and the other is labelled as Reason (R). 
\(A ⇒\) Spin only magnetic moment of \([Fe(CN)_6]^{–3}\) is \(1.73\) B.M. and \([Fe(H_2O)_6]^{+3}\) is \(5.92\) B.M. 
\(R ⇒\) In both cases Fe have \(+3\) oxidation state. 
In the light of the above statements, write the detailed answer:
For a metal ion magnetic moment is calculated to be 4.9BM. Find the number of unpaired.
For a first-order reaction, if the value of \(t_{\frac{1}{2}}\) is T, then the value of \(t_{\frac{7}{8}}\) will be_____ T.

Find the number of atoms per unit cell if edge length is 300pm, density = 3 g/cm3 , molecular mass = 40 g(nearest integer)

Find out difference in oxidation state of Xe in completely Hydrolysed form of XeF4 and XeF6
2 gm of x is present in 1 mole of H2O.Find the mass % of x
25% of 250g sugar solution & 40% of 500g sugar solution are mixed then find out the mass percentage in the solution.

Find the spin magnetic moment ratio for complexes \([Cr(Cn)_{6}]^{-3}\) & \([Cr(H_{2}O)_{6}]^{+3}\)

By weight, 23% NaCl and 19.5% MgCl2 are present in salt water. The degree of dissociation of both salts is 100%. Find the average boiling point of salt water (inºC). (Kb = 0.52 K kg mol–1) (Nearest integer)

NH3, NO, N2, F2, CO, CO2, H2O, and XeF4. Fill the number of above molecules having only two lone pair of electrons.
Ksp of BaSO4 is 8 × 10–11. If the solubility in presence of 0.1 M CaSO4 is?

Glucose is added in 100 gm of water. Lowering in vapor pressure is 0.2 mm Hg. Vapour pressure of pure water is 54.2 mm Hg. Then the weight of glucose is?

How many electrons are gained by MnOΘ4 in strongly alkaline medium?
Radius of the 2nd orbit of He+ is r0. Radius of the 4th orbit of Be3+ is xr0. Find x.

Some amount of urea is added to 1000 gm of H2O due to which vapor pressure decreases by 25% of the original vapor pressure. Find out the mass of urea added (Round off to two decimal places)

Which of the following slows down the process of setting of the cement? 

When 2 gm magnesium reasts with excess of HCl and H2 gas is produced then the volume of H2 gas produced is ____ × 10–2 liter at STP. (Nearest Integer)

IUPAC name of the compound C7H12O2?