List of top Chemistry Questions asked in JEE Main

The functions of antihistamine are :

Two salts A\(_2\)X and MX have the same value of solubility product of 4.0 \(\times\) 10\(^{-12}\). The ratio of their molar solubilities i.e. \(\frac{S(A_2X)}{S(MX)}\) = __________. (Round off to the Nearest Integer)

For the reaction \(A(g) \rightleftharpoons B(g)\) at 495 K, \(\Delta_rG^\circ = -9.478\) kJ mol\(^{-1}\).
If we start the reaction in a closed container at 495 K with 22 millimoles of A, the amount of B in the equilibrium mixture is ____________ millimoles.
(Round off to the Nearest Integer). [R = 8.314 J mol\(^{-1}\) K\(^{-1}\); ln 10 = 2.303]

The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of the trans-complex of CoCl\(_3\) . 4NH\(_3\) is _________. (Round off to the Nearest Integer).

The process that involves the removal of sulphur from the ores is :

Given below are two statements :

Statement I : Both CaCl\(_2\) . 6H\(_2\)O and MgCl\(_2\) . 8H\(_2\)O undergo dehydration on heating.

Statement II : BeO is amphoteric whereas the oxides of other elements in the same group are acidic.

In the light of the above statements, choose the correct answer from the options given below :

Match List - I with List - II :

	List - I Industrial process		List - II Application
(a)	Haber's process	(i)	\(\mathrm{HNO_3}\) synthesis
(b)	Ostwald's process	(ii)	Aluminium extraction
(c)	Contact process	(iii)	\(\mathrm{NH_3}\) synthesis
(d)	Hal-Heroult process	(iv)	\(\mathrm{H_2SO_4}\) synthesis

Choose the correct answer from the options given below :

The type of pollution that gets increased during the day time and in the presence of O\(_3\) is :

Match List - I with List - II :

	List - I Name of oxo acid		List - II Oxidation state of 'P'
(a)	Hypophosphorous acid	(i)	+5
(b)	Orthophosphoric acid	(ii)	+4
(c)	Hypophosphoric acid	(iii)	+3
(d)	Orthophosphorous acid	(iv)	+2
		(v)	+1

Choose the correct answer from the options given below :

Given below are two statements :

Statement I : H\(_2\)O\(_2\) can act as both oxidising and reducing agent in basic medium.

Statement II : In the hydrogen economy, the energy is transmitted in the form of dihydrogen.

In the light of the above statements, choose the correct answer from the options given below :

Which of the following reactions DOES NOT involve Hoffmann bromamide degradation?

The products "A" and "B" formed in above reactions are :

Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R :

Assertion A : Size of Bk\(^{3+}\) ion is less than Np\(^{3+}\) ion.

Reason R : The above is a consequence of the lanthanoid contraction.

In the light of the above statements, choose the correct answer from the options given below :

Which among the following pairs of Vitamins is stored in our body relatively for longer duration?

Which of the following is Lindlar catalyst?

Among the following, the aromatic compounds are :

Choose the correct answer from the following options :

In the above chemical reaction, intermediate "X" and reagent/condition "A" are :

In chromotography technique, the purification of compound is independent of :

Assertion A : Enol form of acetone \([\mathrm{CH_3COCH_3}]\) exists in < 0.1% quantity. However, the enol form of acetyl acetone \([\mathrm{CH_3COCH_2OCCH_3}]\) exists in approximately 15% quantity.

Reason R : Enol form of acetyl acetone is stabilized by intramolecular hydrogen bonding, which is not possible in enol form of acetone.

Choose the correct statement :

Given below are two statements :

Statement I : The E^o value for Ce⁴⁺ / Ce³⁺ is + 1.74 V.

Statement II : Ce is more stable in Ce⁴⁺ state than Ce³⁺ state.

In the light of the above statements, choose the most appropriate answer from the options given below :

The product "P" in the above reaction is :

Given below are two statements : one is labeled as Assertion A and the other is labelled as Reason R :

Assertion A : The H\(-\)O\(-\)H bond angle in water molecule is \(104.5^\circ\).

Reason R : The lone pair - lone pair repulsion of electrons is higher than the bond pair - bond pair repulsion.

In the light of the above statements, choose the correct answer from the options given below :

The \(\mathrm{NaNO_3}\) weighed out to make 50 mL of an aqueous solution containing 70.0 mg \(\mathrm{Na^+}\) per mL is _________ g. (Rounded off to the nearest integer)

[Given : Atomic weight in g mol⁻¹ - Na : 23; N : 14; O : 16]

Emf of the following cell at 298K in V is x \(\times\) 10⁻².

\(\mathrm{Zn|Zn^{2+}(0.1\ M)||Ag^{+}(0.01\ M)|Ag}\)

The value of x is _________. (Rounded off to the nearest integer)

[Given : \(E^{\theta}_{Zn^{2+}/Zn} = -0.76\,V;\ E^{\theta}_{Ag^{2+}/Ag} = +0.80\,V;\ \frac{2.303RT}{F} = 0.059\)]

The pH of ammonium phosphate solution, if pk_a of phosphoric acid and pk_b of ammonium hydroxide are 5.23 and 4.75 respectively, is ___________.