List of top Chemistry Questions

The electrophile involved in sulphonation of benzene is
Identify correctly matched pairs
I. Boron fibres - bullet proof vest
II. Metal borides - nuclear industry
III. Borax - flux in soldering
At T (K), a closed vessel containing 2 g of an ideal gas (A) (molar mass = $ M_A $) exerted a pressure of 1 atm. When 16 g of another ideal gas (B) (molar mass = $ M_B $) was introduced into this vessel, the pressure increased to 2 atm. What is the correct relationship between $ M_A $ and $ M_B $?
One mole of aqueous $ \text{SO}_3^{2-} $ is completely reacted with 2 moles of $ \text{Br}_2 (l) $. What is the oxidation state (s) of S in the product formed?
Chemistry of lanthanides ($ \text{Ln} $) is dominated by +3 oxidation state. Which of the following is incorrect?
Which of the following molecules is not linear?
If $ n $ is the principal quantum number, as per quantum mechanical model of atom, the maximum number of electrons possible in any energy level is limited to

A disaccharide X cannot be oxidised by bromine water. The acid hydrolysis of X leads to a laevorotatory solution. The disaccharide X is

The reactions taking place with 2 - Phenyl - 2 - bromopropane as the starting material is shown below. Identify [A] and [B] formed in the reaction.
C\textsubscript{6}H\textsubscript{5} - C(Br)C\textsubscript{2}H\textsubscript{5} \xrightarrow{\text{KOH Alcoholic}} [A]
[A] + HBr $\to$ [B]
The reaction taking place in a galvanic cell is as given
A(s) + B\textsuperscript{2+} (11100\textsuperscript{-3}M) $\rightarrow$ B(s) + A\textsuperscript{2+} (0.1M)
The emf of the cell is +2.651 V. If the standard emf of the cell is +2.71 V, what is the value of X?
Which one of the following will undergo Nucleophilic substitution, by $S_N^1$ mechanism, fastest?
The energy of an electron in the ground state of Hydrogen atom is $-2.18 \times 10^{-18}$ J. What would be the energy associated with the second excited state of Li$^+$?
What would be the final product [X] formed when p-Toluene undergoes the following series of reactions?
Arrange the following in the decreasing order of their Dipole moments.
Identify the incorrect statement.
Identify the catalyst used in the reaction between iodide and persulphate ions.
Which one of the following correctly represents the decreasing order of acidic nature of the given carboxylic acids:
[A] 2-Hydroxybenzoic acid
[B] Benzoic acid
[C] 3-Hydroxybenzoic acid
[D] 4-Hydroxybenzoic acid

Find the correct matches of the substances, given in Column I, from their characteristic properties given in Column II.

The rate constant for a First order reaction at 560 K is $1.5 \times 10^{-6}$ per secon(D) If the reaction is allowed to take place for 20 hours, what percentage of the initial concentration would have converted to products?
A gas taken in a closed vessel is heated from 54°C to 1254°(C) The pressure of the gas becomes __________ times its original pressure \( P_1 \).
In the given Redox equation, identify the stoichiometric coefficients w, x, y, and z.
The given equation: \[ \text{ClO}_3^{-} + w\text{Cl}^{-} + x\text{H}^{+} \rightarrow y\text{H}_2\text{O} + z\text{Cl}_2 \]
One among the 4 Vitamins belonging to B Complex, can be stored in our body. Identify the Vitamin.

Structures of 3 Monosaccharides are given below. Two of them are Anomers. Identify the two Anomers.

Identify the correct statement describing the characteristics of \(C_2\) molecule.
Which one of the following statements is correct?