List of top Chemistry Questions

Consider the following reaction: \[ \text{Zn}_{(s)} + \text{Ag}_2\text{O}_{(s)} + \text{H}_2\text{O}_{(l)} \rightarrow \text{Zn}^{2+}_{(aq)} + 2\text{Ag}_{(s)} + 2\text{OH}^-_{(aq)} \] Given: \[ E^\circ_{\text{Ag}^+/\text{Ag}} = 0.80 \text{ V} \] \[ E^\circ_{\text{Zn}^{2+}/\text{Zn}} = -0.76 \text{ V} \] \[ 1F = 96500 \text{ C mol}^{-1} \] $\Delta G^\circ$ for above reaction is:

Which of the following is not a periodic property?

The number of radial nodes in 3s and 2p orbitals, respectively are

The order of the average bond length of the given bonds is

A balloon filled with an air sample occupies 3 L volume at 35 °C. On lowering the temperature to T, the volume decreases to 2.5 L. The temperature T is [Assume P constant]

Half-life of zero order reaction \( A \to \) product is 1 hour, when initial concentration of reactant is 2.0 mol L\(^{-1}\). The time required to decrease concentration of A from 0.50 to 0.25 mol L\(^{-1}\) is:

The product formed in the following reaction is:

Identify the aromatic compounds among the given set based on Huckel's rule:

Identify products \(P_1\) and \(P_2\) formed when Benzonitrile undergoes the following reactions:

(I) Benzonitrile \(\xrightarrow[(ii)\ H_3O^+]{(i)\ SnCl_2/HCl/ether} [X]\) (II) \([X] \xrightarrow[(ii)\ H_3O^+]{(i)\ HCN} [P_1]\) (III) \(2\) moles of \(X + 50% NaOH \rightarrow [P_2] +\) Salt

Identify the law which is stated as “For any solutions, the partial vapour pressure of each volatile component in the solution is directly proportional to its mole fraction”.

How many molecules of \(CO_2(g)\) are obtained on reaction of 24 grams of methane with 4 moles of oxygen?

Two statements [A] and [B] are given below. Choose the correct option. A) Protonated \(R-CH_2-OH\) can serve as electrophiles while neutral \(R-OH\) acts as a nucleophile. B) The bond between \(O-H\) cleaves when \(R-CH_2-OH\) acts as electrophiles and the bond between \(C-O\) cleaves when they act as nucleophiles.

Match the characteristic from Col. I with the Vitamins given in Col. II.

When the concentration of the reactant in a given reaction is halved and if the rate of reaction is halved, the order of the reaction is:

The system that forms maximum boiling azeotrope is:

A compound \(C_3H_5N\) undergoes reduction to form a primary amine. The amine gives compounds [B] and [C] in the following reactions. Identify [B] and [C].

Identify \(o\)-ethyl anisole.

Which of the following statements is correct?

Assertion (A): Mercury is not a transition element.
Reason (R): Mercury is a liquid metal.

Identify reagents [A] and [B] in the following reactions of Salicylic acid.

\(o\)-hydroxybenzaldehyde is a liquid while the \(p\)-isomer is a solid because:

Bond pairs and lone pairs in \(IF_5\) are respectively: