List of top Chemistry Questions asked in JEE Main

For the given coordination compounds:
(A) \([Ni(NH_3)_6]^{2+}\) is \(sp^3d^2\), octahedral and paramagnetic.
(B) \([Ni(CO)_4]\) is \(sp^3\), tetrahedral and paramagnetic.
(C) \([Ni(CN)_4]^{2-}\) is \(dsp^2\), square planar and diamagnetic.
(D) \([NiCl_4]^{2-}\) is \(sp^3\), tetrahedral and paramagnetic.
The correct set of coordination compounds against the mentioned properties is

How many of the following reaction(s) product formed can also be prepared by Gabriel phthalimide synthesis:

In a period, ionization energy of left most element is _ _ _ _ _ _ _ _ and \(|\Delta H_{eg}|\) value of right most element is _ _ _ _ _ _ _ _ . [Except noble gases]

1 mol of alkane (X) for complete combustion required 8 mol of oxygen. When it is brominated in presence of sunlight it gives only one product. How many primary carbons are present in alkane (X)?

Statement I: The bond angle order in \( OF_2, H_2O, OCl_2 \) is \( OF_2<H_2O<OCl_2 \)
Statement II: \( SiF_4, SnF_4, \) and \( PbF_4 \) are all ionic compounds.

0.2M, 500ml MnO\(_4^-\) solution is treated with 1.5M, 500ml KI solution in basic medium. The liberated \(I_2\) required ‘X’M, 300ml hypo solution. The value of ‘X’ is -

If the Bohr's radius of H-atom is 52.9 pm and radius of H-like species is 70.53 pm, then chemical species and orbit number are respectively.

‘X’ is the nitrogen containing compound which is added to freshly prepared FeSO\(_4\) and dilute H\(_2\)SO\(_4\) to form a brown ring complex ‘Y’.
Identify X and Y.

Statement I: Of the following compounds \( SO_2, SO_3, H_2S, SF_4 \); only three compounds have a complete octet.
Statement II: For the given set of compounds \([SF_4, BrF_5, ClF_3], [NH_3, BrF_5, SF_4], [H_2O, IF_5, XeF_4]\) only one set of compounds has one lone pair on all central atoms.

Column-I (Isothermal process)

Highest X-O bond order is, (X is central atom)

If \( r_A \) and \( r_B \) are the radii of elements A and B respectively. Element A and B are covalently bonded. What will be the bond length and total length of the molecule?

Statement I: \( \mathrm{ClO_4^-} \), \( \mathrm{ICl_4^-} \), \( \mathrm{IBr_2^-} \) are tetrahedral, square planar and linear respectively.
Statement II: \( \left[\mathrm{Fe(CN)_6}\right]^{4-} \) is \( \mathrm{d^2sp^3} \) hybridized.

Statement I : Aluminium reacts with excess of \( \mathrm{NaOH} \) to form \( [\mathrm{Al(OH)_6}]^{3-} \)
Statement II : For the complex \( [\mathrm{Fe(H_2O)_6}]^{3+} \) : \( \left[ \left( d_{xy} = d_{yz} = d_{zx} \right) < \left( d_{x^2-y^2} = d_{z^2} \right) \right] \)
and for the complex \( [\mathrm{FeCl_4}]^{2-} \) : \( \left[ \left( d_{xy} = d_{yz} = d_{zx} \right) > \left( d_{x^2-y^2} = d_{z^2} \right) \right] \)

Find stability order of the following alkenes:
(a) Cis-but-2-ene
(b) 2,3-Dimethylbut-2-ene
(c) 2-Methylbut-2-ene
(d) Propene

Which compound has total molecular mass of 72 with three primary carbons?

Grignard reagent \( RmgX \) reacts with water and releases a gas \( X \) which has volume 1.4 dm\(^3\)/g at 1 atm, 273 K.
\( X \) reacts with \( I_2 \) and forms \( Y \) which reacts with Na in the presence of dry ether to form \( Z \). Find the molecular mass of \( Z \).

For the reaction \(A \longrightarrow \text{Product}\), the following graph is observed between half life \((t_{1/2})\) and initial concentration of \(A\). Then find the value of \(x\).

Which of the following statement is incorrect regarding tertiary structure of protein?

Statement-I: Benzamide on reaction with \( \text{Br}_2 + \text{NaOH} \) gives benzyl amine.
Statement-II: On nitration of aniline, the meta product is formed more than the ortho product.