List of top Chemistry Questions asked in JEE Main

is reached with regents is List-I to from products in List-II.

Choose the correct answer from the options given below :

The number of sp² hybridized carbon atoms in the following peptide is Ala – Phe – Gly – Ala – Phe - Ley

For given cell, at T K
Pt | H₂(g) | H⁺ || Fe³⁺ ; Fe²⁺ | Pt
( 1 bar ) ( 1 M )
E_cell = .712 V
E^°_cell = .770 V
if \(\frac{[Fe^{2+}]}{[Fe^{3+}]}\) is t \((\frac{2.303\ RT}{F}=.058)\)
then find \((\frac{t}{5})\)

For the 1st order reactions, the ratio of t_50% to t_87.5% will be:

Based on the given figure, the number of correct statement/s is/are ______.

A. Surface tension is the outcome of equal attractive and repulsion forces acting on the liquid molecule in bulk.
B. Surface tension is due to uneven forces acting on the molecules present on the surface.
C. The molecule in the bulk can never come to the liquid surface.
D. The molecules on the surface are responsible for vapour pressure if the system is a closed system.

Determine the amount of urea (NH₂CONH₂) to be added in 1000 g of water to decrease its vapour presssure by 25%.
Given: Molar mass of N. C. O and H are 14. 12. 16 and 1 2 mol^-1 respectively.

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

Choose the correct option.

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.

K_sp 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?

	List-I (Reagent)		List-II (Products)
A		I
B	HBF₄\(\triangle\)	II
C	Cu, HCI	III
D	CuCN/ KCN	IV