List of top Chemistry Questions

What is the pH of a solution if the concentration of \( \text{H}^+ \) ions is \( 1 \times 10^{-5} \) mol/L?
What is the molar volume of an ideal gas at standard temperature and pressure (STP)?
Which of the following compounds has the highest boiling point?
Why is there always a decreasing tendency of solubility of gases in liquid on rising temperature?
What is the pH of a solution of \( 0.01 \, \text{M} \, \text{HCl} \)?
What is the standard electrode potential of a half-reaction in which electrons are transferred from \(Ag^+\) to \(Ag\)?
Which of the following gases has the highest density at STP?
What is the molecular mass of \( \text{K}_2\text{SO}_4 \)?

The major product (A) formed in the following reaction sequence is

The total maximum number of electrons possible in 3d, 6d, 5s and 4f orbitals with \(m_l\) (magnetic quantum number) value -2 is
Assertion (A): The boiling points of alkyl halides decrease in the order: RI > RBr > RCl > RF.
Reason (R): The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass.
What is the action of : (i) Liquid bromine in acetic acid on anisole. (ii) Soda-lime on sodium acetate?

Given below are two statements: 
Statement I: Experimentally determined oxygen-oxygen bond lengths in the \( O_2 \) are found to be the same and the bond length is greater than that of a \( O=O \) (double bond) but less than that of a single \( O-O \) bond. 
Statement II: The strong lone pair-lone pair repulsion between oxygen atoms is solely responsible for the fact that the bond length in ozone is smaller than that of a double bond \( O=O \) but more than that of a single bond \( O-O \). 
In light of the above statements, choose the correct answer from the options given below:

Match List - I with List - II: 

 

At temperature T, compound \( {AB}_2 \) dissociates as \( {AB}_2 \rightleftharpoons {A} + \frac{1}{2} {B}_2 \), having degree of dissociation \( x \) (small compared to unity). The correct expression for \( x \) in terms of \( K_p \) and \( p \) is:
The correct increasing order of stability of the complexes based on \( \Delta \) value is:
Find the compound \( A \) from the following reaction sequences: \[ A \xrightarrow{\text{aqua regia}} B \xrightarrow{(1) \, \text{KNO}_3, \, \text{NH}_4\text{OH}} \text{yellow ppt}. \]
The molar conductivity of a weak electrolyte when plotted against the square root of its concentration, which of the following is expected to be observed?

In the following substitution reaction:

Match List - I with List - II: 

Choose the correct answer from the options given below:
 

Given below are two statements: Statement (I): The radius of isoelectronic species increases in the order. \[ {Mg}^{2+}<{Na}^+<{F}^-<{O}^{2-} \] Statement (II): The magnitude of electron gain enthalpy of halogens decreases in the order. \[ {Cl}>{F}>{Br}>{I} \] In light of the above statements, choose the most appropriate answer from the options given below:
The successive 5 ionisation energies of an element are 800, 2427, 3658, 25024 and 32824 kJ/mol, respectively. By using the above values, predict the group in which the above element is present:
Which of the following acids is a vitamin?
The conditions and consequences that favour the \( t_{2g}^3 e_g^1 \) configuration in a metal complex are:
The most stable carbocation from the following is: