WB JEE 2022

Which of the following would produce enantiomeric products when reacted with methyl magnesium iodide?

The product of the following reaction is :

The product of the following hydrogenation reaction is:

The above conversion can be carried out by,

The number of unpaired electron in Mn2+ ion is

The de-Broglie wavelength (\(\lambda\)) for electron (e), proton (p) and He2+ ion (\(\alpha\)) are in the following order. Speed of e, p and \(\alpha\) are the same

In Bohr model of atom, radius of hydrogen atom in ground state is r1 and radius of He+ ion in ground state is r2. Which of the following is correct?

Which one of the following is the correct set of four quantum numbers (n, 1, m, s) ?

What is the correct order of acidity of salicylic acid, 4-hydroxybenzoic acid, and 2, 6-dihydroxybenzoic acid ?

XeF2, NO2, HCN, ClO2, CO2.
Identify the non-linear molecule-pair from the above mentioned molecules.

The boiling point of the water is higher than liquid HF. The reason is that

The correct bond order of B-F bond in BF3 molecule is :

Which of the statements are incorrect?

Sodium nitroprusside is :

Choose the correct statement for the [Ni(CN)4]2\(-\) complex ion (Atomic no. of Ni = 28)

The average speed of H2 at T1K is equal to that of O2 at T2K. The ratio T1 : T2 is

Avogadro's law is valid for

Let (Crms)H2 is 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 ?

The correct order of relative stability for the given free radicals is :

Hybridisation of the negative carbons in (1) and (2) are

The major product of the following reaction is
\({F_3}C - CH = C{H_2} + HBr \to\)

The metal-pair that can produce nascent hydrogen in alkaline medium is :

Which of the following is radioactive?

The correct relationship between molecules I and II is

The enol form in which ethyle-3-oxobutanoate exists is

How many monobriminated product(s) (including stereoisomers) would form in the free radical bromination of n-butane?

The correct order of relative stability of the given conformers of n-butane is

Pick the correct statement.

During the preparation of NH3 in Haber's process, the promoter(s) used is/are -

The correct pair of electron affinity order is

Oxidation states of Cr in K2Cr2O7 and CrO5 are respectively

The number of atoms in body centred and face centred cubic unit cell respectively are

How much solid oxalic acid (Molecular weight 126) has to be weighed to prepare 100 ml. exactly 0.1 (N) oxalic acid solution in water?

\({C_6}{H_6}(liq) + {{15} \over 2}{O_2}(g) \to 6C{O_2}(g) + 3{H_2}O(liq)\)
Benzene burns in oxygen according to the above equation. What is the volume of oxygen (at STP) needed for complete combustion of 39 gram of liquid benzene?

A metal (M) forms two oxides. The ratio M:O (by weight) in the two oxides are 25:4 and 25:6. The minimum value of atomic mass of M is

1 mL of water has 25 drops. Let N0 be the Avogadro number. What is the number of molecules present in 1 drop of water ? (Density of water = 1 g/mL)

The correct order of acidity of the following hydra acids is

A sample of MgCO3 is dissolved in dil. 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 form...

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 correct statement(s) about B2H6 is /are :

A particle moving in a straight line starts from rest and the acceleration at any time t is \(a - k{t^2}\) where a and k are positive constants. The maximum velocity attained by the particle is

From a balloon rising vertically with uniform velocity v ft/sec a piece of stone is let go. The height of the balloon above the ground when the stone reaches the ground after 4 sec is [g = 32 ft/sec2]

Area of the figure bounded by the parabola \({y^2} + 8x = 16\) and \({y^2} - 24x = 48\) is

Let f be a non-negative function defined in \([0,\pi /2]\), f' exists and be continuous for all x and \(\int\limits_0^x {\sqrt {1 - {{(f'(t))}^2}} dt = \int\limits_0^x {f(t)dt} }\) and f (0) = 0. Then

The number of zeros at the end of \(\left| \!{\underline {\, {100} \,}} \right.\) is

A curve passes through the point (3, 2) for which the segment of the tangent line contained between the co-ordinate axes is bisected at the point of contact. The equation of the curve is

If the equation of one tangent to the circle with centre at (2, \(-\)1) from the origin is 3x + y = 0, then the equation of the other tangent through the origin is

The side AB of \(\Delta\)ABC is fixed and is of length 2a unit. The vertex moves in the plane such that the vertical angle is always constant and is \(\alpha\). Let x-axis be along AB and the origin be at A. Then the locus of the vertex is

Two circles \({S_1} = p{x^2} + p{y^2} + 2g'x + 2f'y + d = 0\) and \({S_2} = {x^2} + {y^2} + 2gx + 2fy + d' = 0\) have a common chord PQ. The equation of PQ is

A straight line meets the co-ordinate axes at A and B. A circle is circumscribed about the triangle OAB, O being the origin. If m and n are the distances of the tangent to the circle at the origin from the points A and B respectively, the d...