List of top Chemistry Questions asked in WBJEE

Liquor ammonia is
If the value of $C_{p}$ for nitrogen gas is $j K ^{-1} mol ^{-1}$, then the value of $\Delta H$ on heating $28 \,g$ of nitrogen gas from $0^{\circ} C$ to $100^{\circ} C$ at constant pressure will be :
A human body required the 0.01 M activity of radioactive substance after 24 h. Half-life of radioactive substance is 6 h. Then, injection of maximum activity of radioactive substance that can be injected will be
A certain reaction proceeds in a sequence of three elementary steps with rate constants k1, k2 and k3. If the observed rate constant, Kobs, of the reaction is expressed as Kobs = K3 [K1/K2]1/2, then what is the observed energy of activation of the reaction?
Reagents which cannot be used to distinguish allyl bromide and n-propyl bromide are
The given amino acid reacts with:
When nitrobenzene is treated with Br2 in the presence of FeBr3, m-bromo nitrobenzene is formed as a major product. The statement(s) related to this m-isomer is/are
Complexes formed in the cyanide process are:
A solution of colourless unknown salt (X) on boiling with excess of NaOH produces non-flammable gas. The gas evolution ceases after some time. Upon addition of Zn dust to the same solution, the gas evolution restarts. The colourless salt (X) is (are)
The longest wavelength in Ao in the Balmer series of singly ionised helium ion, He+ is
Consider the following reaction in aqueous medium at 25oC.
The equilibrium of above reaction shifts towards left in the presence of
3-tert-butylphenol reacts with different halogens by electrophillic substitution under appropriate conditions that are given below:
The observed pattern of electrophillic substitution can be explained by
Which of the following is the most suitable reagent used to distinguish compound (3) from rest of the compounds? 1. CH3−C≡C−CH32. CH3−CH2−CH2−CH33. CH3−CH2C : CH4. CH3−CH=CH2
Sulphuric acid reacts with sodium hydroxide as follows.H2SO4 + 2NaOH ⇒ Na2SO4 + 2H2Ohen 1L of 0.1 M sulphuric acid solution is allowed to react with 1 L of 0.1 M sodium hydroxide solution, the amount of sodium sulphate formed and its molarity in the solution obtained is
Select the option(s) in which rate of SN1 is faster in II than I?
The two structures written below represent 
Which of the following is/are endothermic reaction(s)?
Diborane undergo unsymmetrical cleavage reactions with:
Which of the following statements is/are correct?
Q in the above sequence of reactions is
Consider the following species (I)S4O62−(II)S3O9(III)S2O52−(IV)P3O93−Which of the above species have same number of X−0−X linkages? (X=P or S)
The correct statement(s) about following sugars (X) and (Y) is/are:
Blackened oil painting can be restored into original form by the action of:
Which one of the following observations is not true when a mixture of KCl, K2Cr2O7 and conc. H2SO4 is warmed carefully?
The addition of HBr to 2-pentene gives