List of top Questions asked in WBJEE

Let A be the point (0,4) in the xy-plane and B be the point (2t,0). Let L be AB's midpoint and let AB's perpendicular bisector meet the y-axis M. Let N be the midpoint of LM. The locus of N is
The straight lines x+2y-9=0, 3x+5y-5=0, and ax+by-1=0 are concurrent if the straight line 35x-22y+1=0 passes through the point:
In the extraction of genetic material (DNA), which enzyme is not used?
A uniform rope of length 4 m and mass 0.4kg is held on a frictionless table in such a way that 0.6m of the rope is hanging over the edge. The work done to pull the hanging part of the rope onto the table is, (Assuming g=10m/s2) 
Which of the statements are incorrect?
Which of the following would produce enantiomeric products when reacted with methyl magnesium iodide?
During the preparation of NH3 in Haber’s process, the promoter(s) used is/are:
The correct statement(s) about B2H6 is/are:
The above conversion can be carried out by:
Let (Cms)H2 be the r.m.s speed of H2 at 150 K. At what temperature, the most probable speed of helium [(Cmp)He] will be half of (Crms)H2?
Pick the correct statement:
The product of the following hydrogenation reaction is:
The correct order of relative stability for the given free radical is:
The correct pair of electron affinity order is:
The product of the following reaction is:
The correct order of acidity of the following hydra acids is:
Hybridisation of the negative carbons in (1) and (2) are:
Hybridisation of the negative carbons
Oxidation states of Cr in K2Cr2O7 and CrO5 are, respectively:
Which of the following is radioactive?
The correct relationship between molecule I and II is:
correct relationship between molecule I and II
To a solution of colourless sodium salt, a solution of lead nitrate was added to have a white precipitate which dissolves in warm water and reprecipitates on cooling. Which of the following acid radical is present in the salt?
The boiling point of water is higher than liquid HF. The reason is that:
Choose the correct statement for the [Ni(CN)4]²⁻ complex ion (Atomic no. of Ni = 28)
Sodium nitroprusside is:
A sample of MgCO3 is dissolved in dilute HCl and the solution is neutralized with ammonia and buffered with NH4Cl / NH4OH. Disodium hydrogen phosphate reagent is added to the resulting solution. A white precipitate is formed. What is the formula of the precipitate?