JEE Main entrance exam Question Bank Solutions

Formic acid and formaldehyde can be distinguished by treating with ______.

Which primitive unit cell has unequal edge lengths (a ≠ b ≠ c) and all axial angles different from 90°?

Hydrogen ion concentration in mol/L in a solution of pH = 5.4 will be ______.

Assuming that the degree of hydrolysis is small, the pH of 0.1 M solution of sodium acetate (K_a = 1.0 × 10⁻⁵) will be ______.

The pH of a 0.02 M NH₄Cl solution will be ______.

[Given: K_b(NH₄OH] = 10⁻⁵ and log 2 = 0.301)

Given below are two statements:

Statement I: The esterification of carboxylic acid with an alcohol is a nucleophilic acyl substitution.

Statement II: Electron withdrawing groups in the carboxylic acid will increase the rate of esterification reactions.

Choose the most appropriate options.

In the given reaction,

The number of n electrons present in the product 'P' is ______.

In an ionic solid r₍₊₎ = 1.6 Å and r₍₋₎ = 1.864 Å. Use the radius ratio rule to the edge length of the cubic unit cell is ______ Å.

An element A (Atomic weight = 100) having bcc structure has a unit cell edge length 400 pm. The number of atoms in 10 g of A is ______ × 10²² unit cells.

A reaction of ethyl amine and acetic anhydride leads to the formation of ______.

The ratio of number of atoms present in a simple cubic, body-centred cubic and face-centred cubic structure are, respectively ______.

Which of the following oxoacids of sulphur contains "S" in two different oxidation states?

The solubility of AgCl will be maximum in which of the following?

The incorrect statements is:

For the following Assertion and Reason, the correct option is:

Assertion (A): When Cu (II) and sulphide ions are mixed they react together extremely quickly to give a solid.

Reason (R): The equilibrium constant of \[\ce{Cu^{2+}(aq) + S^{2-}(aq) <=> CuS(s)}\] is high because the solubility product is low.

An organic compound X showing the following solubility profile is:

If solubility product of Zr₃(PO₄)₄ is denoted by K_sp and its molar solubility is denoted by S, then which of the following relation between S and K_sp is correct?

Identify product A in the following reaction.

\[\begin{array}{cc}
\ce{COOH}\phantom{.......}\\
/\phantom{...............}\\
\ce{CH2 ->[\Delta] CH3COOH + A}\\
\backslash\phantom{................}\\
\ce{COOH}\phantom{........}
\end{array}\]

Water soluble salt among AgNO₃, AgF and AgClO₄ are:

Which of the following salts will turn water coloured when fumes evolved on treatment with conc. H₂SO₄ are passed in water?