List of top Chemistry Questions asked in JEE Main

Number of unpaired electron in highest occupied molecular orbital of following species is :\(N_2, N ^+_ 2 , O_2, O^+_ 2 \) ? 

Which one amongst the following are good oxidizing agents?
(A) \( \text{Sm}^{\text{2+}}\)
(B) \(\text{Ce}^{\text{2+}}\)
(C)\( \text{Ce}^{\text{4+}}\)
(D) \(\text{Tb}^{\text{4+}}\)
Choose the most appropriate answer from the options given below:

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R 
Assertion (A) : Benzene is more stable than hypothetical cyclohexatriene 
Reason (R) : The delocalised π-electrons cloud is attracted more strongly by the nuclei of the carbon atoms than the electron cloud localised between two carbon atoms.
In the light of the above statements, choose the correct answer from the options given below

Graph of X-ray frequency (v)n v/s atomic number (Z) is linear. Find the value of n.

The starting material for convenient preparation of deuterated hydrogen peroxide \(\left(D_2 O _2\right)\) in laboratory is :

Correct order of strength of H-bond in the following -:
(A) Liquid water
(B) Ice 
(C) Impure water

Given below are two statements:
Statement-I: Pure Aniline and other arylamines are usually colourless.
Statement-II: Arylamines get coloured on storage due to atmospheric reduction
In the light of the above statements, choose the most appropriate answer from the options given below:

\(H_2O_2\) behave like reducing agent in which of the following reactions:

S₁: Be⁺² has higher SRP than other alkaline earth metals.
S₂: Be⁺² has higher hydration energy and greater △aH (atomisation enthalpy) than other alkaline earth metals.

Match List I with List II:

Choose the correct answer from the options given below:

The effect of addition of helium gas to the following reaction in equilibrium state, is : \(PCl _5( g ) \rightleftharpoons PCl _3( g )+ Cl _2( g )\)