List of top Chemistry Questions

Choose the correct answer from the options given below:

Statement – 1: First ionization energy of Ge is greater than Si.
Statement – 2: First ionization energy of Pb is greater than Sn.

In the given structure, number of \( sp \) and \( sp^2 \) hybridized carbon atoms present respectively are:

The reaction \( {A}_2 + {B}_2 \to 2{AB} \) follows the mechanism: \[ {A}_2 \xrightarrow{k_1} {A} + {A} \ ({fast}) \quad {A} + {B}_2 \xrightarrow{k_2} {AB} + {B} \ ({slow}) \quad {A} + {B} \to {AB} \ ({fast}) \] The overall order of the reaction is:

Which of the following mixing of 1M base and 1M acid leads to the largest increase in temperature?

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:

The conditions and consequences that favour the \( t_{2g}^3 e_g^1 \) configuration in a metal complex are:

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:

Find the compound \( A \) from the following reaction sequences: \[ A \xrightarrow{\text{aqua regia}} B \xrightarrow{(1) \, \text{KNO}_3, \, \text{NH}_4\text{OH}} \text{yellow ppt}. \]

Match List - I with List - II:

Choose the correct answer from the options given below:

The structure of the major product formed in the following reaction is:

Choose the correct statements.
(A) Weight of a substance is the amount of matter present in it.
(B) Mass is the force exerted by gravity on an object.
(C) Volume is the amount of space occupied by a substance.
(D) Temperatures below \(0^\circ\)C are possible in Celsius scale, but in Kelvin scale negative temperature is not possible.
(E) Precision refers to the closeness of various measurements for the same quantity.
Choose the correct answer from the options given below:

Match List - I with List - II: List - I: (A) Amylase
(B) Cellulose
(C) Glycogen
(D) Amylopectin
List - II: (I) \( \beta \)-C1-C4 plant
(II) \( \alpha \)-C1-C4 animal
(III) \( \alpha \)-C1-C4 \( \alpha \)-C1-C6 plant
(IV) \( \alpha \)-C1-C4 plant
Choose the correct answer from the options given below:

For hydrogen atom, the orbital/s with lowest energy is/are:

When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be:

The correct option with order of melting points of the pairs (Mn, Fe), (Tc, Ru) and (Re, Os) is:

The elemental composition of a compound is 54.2% C, 9.2% H, and 36.6% O. If the molar mass of the compound is 132 g/mol, the molecular formula of the compound is:

In the reaction \( 2\text{H}_2\text{O}_2 \rightarrow 2\text{H}_2\text{O} + \text{O}_2 \), what is the role of potassium iodide (KI) in this reaction?

In an oxidation-reduction reaction, what happens to the oxidation state of the central atom in \( \text{MnO}_4^- \) when it is reduced to \( \text{Mn}^{2+} \)?

What is the shape of the \( \text{ClO}_2^- \) ion according to VSEPR theory?

Which of the following compounds exhibits ionic bonding?

The ascending order of relative rate of solvolysis of the following compounds is: \includegraphics[]{60.PNG} \begin{itemize} \item (A) Cyclohexyl bromide \item (B) Benzyl bromide \item (C) Phenylmethyl bromide \item (D) Allyl bromide \end{itemize}

A solution of glucose (molar mass = 180 g mol\(^{-1}\)) in water has a boiling point of 100.20°C. Calculate the freezing point of the same solution. Molal constants for water \(K_f\) and \(K_b\) are 1.86 K kg mol\(^{-1}\) and 0.512 K kg mol\(^{-1}\) respectively.

The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of Cr^{3+ ion (Atomic no. : Cr = 24) is: