List of top Chemistry Questions asked in JEE Main

The number of octahedral voids per lattice site in a lattice is _________. (Rounded off to the nearest integer)

The number of stereoisomers possible for \(\mathrm{[Co(ox)_2(Br)(NH_3)]^{2-}}\) is ___________. [ox = oxalate]

When 12.2 g of benzoic acid is dissolved in 100 g of water, the freezing point of solution was found to be \(-0.93^\circ\mathrm{C}\) (\(K_f(\mathrm{H_2O}) = 1.86\ \mathrm{K\ kg\ mol^{-1}}\)). The number (n) of benzoic acid molecules associated (assuming 100% association) is ___________.

The average S-F bond energy in kJ mol⁻¹ of \(\mathrm{SF_6}\) is _____________. (Rounded off to the nearest integer)

[Given : The values of standard enthalpy of formation of \(\mathrm{SF_6(g)}\), \(\mathrm{S(g)}\) and \(\mathrm{F(g)}\) are - 1100, 275 and 80 kJ mol⁻¹ respectively.]

Match List - I with List - II.

	List - I		List - II
(a)	Sodium Carbonate	(i)	Deacon
(b)	Titanium	(ii)	Castner-Kellner
(c)	Chlorine	(iii)	van-Arkel
(d)	Sodium hydroxide	(iv)	Solvay

Choose the correct answer from the options given below :

If the activation energy of a reaction is 80.9 kJ mol^-1, the fraction of molecules at 700 K, having enough energy to react to form products is \(e^{-x}\). The value of x is __________. (Rounded off to the nearest integer) [Use \(R = 8.31\ \mathrm{J\ K^{-1}\ mol^{-1}}\)]

In mildly alkaline medium, thiosulphate ion is oxidized by \(\mathrm{MnO_4^-}\) to "A". The oxidation state of sulphur in "A" is __________.

The nature of charge on resulting colloidal particles when \(\mathrm{FeCl_3}\) is added to excess of hot water is :

Match List - I with List - II.

	List - I		List - II
(a)	Siderite	(i)	Cu
(b)	Calamine	(ii)	Ca
(c)	Malachite	(iii)	Fe
(d)	Cryolite	(iv)	Al
		(v)	Zn

Choose the correct answer from the options given below :

Identify A in the given chemical reaction.

Seliwanoff test and Xanthoproteic test are used for the identification of ___________ and ________ respectively.

Considering the above reaction, the major product among the following is :

Match List - I with List - II.

	List - I		List - II
(a)	Sucrose	(i)	\(\beta\)-D-Galactose and \(\beta\)-D-Glucose
(b)	Lactose	(ii)	\(\alpha\)-D-Glucose and \(\beta\)-D-Fructose
(c)	Maltose	(iii)	\(\alpha\)-D-Glucose and \(\alpha\)-D-Glucose

Choose the correct answer from the options given below :

Match List - I with List - II.

Choose the correct answer from the options given below :

Which pair of oxides is acidic in nature?

Identify A in the following chemical reaction.

2, 4-DNP test can be used to identify :

Identify A in the given reaction.

In \(\overset{1}{\mathrm{C}}\mathrm{H_2} = \overset{2}{\mathrm{C}} = \overset{3}{\mathrm{C}}\mathrm{H} - \overset{4}{\mathrm{C}}\mathrm{H_3}\) molecule, the hybridization of carbon 1, 2, 3 and 4 respectively, are :

Which of the following forms of hydrogen emits low energy \(\beta^-\) particles?

Ceric ammonium nitrate and \(\mathrm{CHCl_3}\)/alc. KOH are used for the identification of functional groups present in __________ and _______ respectively.

A. Phenyl methanamine

B. N,N-Dimethylaniline

C. N-Methyl aniline

D. Benzenamine

Choose the correct order of basic nature of the above amines.

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

Assertion A : In \(\mathrm{TlI_3}\), isomorphous to \(\mathrm{CsI_3}\), the metal is present in +1 oxidation state.

Reason R : Tl metal has fourteen f electrons in its electronic configuration.

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

Match List - I with List - II.

	List - I (Molecule)		List - II (Bond order)
(a)	\(\mathrm{Ne_2}\)	(i)	1
(b)	\(\mathrm{N_2}\)	(ii)	2
(c)	\(\mathrm{F_2}\)	(iii)	0
(d)	\(\mathrm{O_2}\)	(iv)	3

Choose the correct answer from the options given below :

A certain gas obeys \(\mathrm{P(V_m - b) = RT}\). The value of \(\left(\dfrac{\partial Z}{\partial P}\right)_T\) is \(\dfrac{xb}{RT}\). The value of x is _________. (Integer answer) (Z : compressibility factor)