List of top Chemistry Questions

A linear octasaccharide (molar mass = 1024 g mol$^{-1}$) on complete hydrolysis produces three monosaccharides: ribose, 2-deoxyribose and glucose. The amount of 2-deoxyribose formed is 58.26 % (w/w) of the total amount of the monosaccharides produced in the hydrolyzed products. The number of ribose unit(s) present in one molecule of octasaccharide is _____.
Use: Molar mass (in g mol$^{-1}$): ribose = 150, 2-deoxyribose = 134, glucose = 180; Atomic mass (in amu): H = 1, O = 16

When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams is ----- (nearest integer).

The following graph indicates the system containing 1 mole of gas involving various steps. When it moves from Z to X, the type of undergoing process is:

How many grams of calcium carbonate ($\mathrm{CaCO}_3$) are required to completely neutralize 200 mL of 0.5 M HCl? Given the reaction: $$ \mathrm{CaCO}_3 + 2 \mathrm{HCl} \rightarrow \mathrm{CaCl}_2 + \mathrm{H}_2 \mathrm{O} + \mathrm{CO}_2 $$ (Molar mass of $\mathrm{CaCO}_3 = 100 \, \text{g/mol}$)

What is the pH of a $ 0.01 \, \text{M} $ solution of $ \text{NaOH} $?

A current of 2 A is passed through molten CaCl$_2$ for 1930 seconds. What is the mass of calcium deposited at the cathode? (Ca molar mass = 40 g/mol, valency = 2, Faraday's constant = 96500 C/mol)

Calculate the boiling point of a solution containing 18 g of glucose (C$_6$H$12$O$_6$) in 100 g of water. (K₋b = 0.52°C·kg/mol, Molar mass of glucose = 180 g/mol)

Calculate the molality of a solution prepared by dissolving 10 g of NaCl ($ M = 58.5 \, \text{g/mol} $) in 500 g of water:

Calculate the volume occupied by 4.4 g of CO$_2$ gas at 27°C and 1 atm pressure. ($ R = 0.0821 \, \text{L-atm/mol-K} $, Molar mass of CO$_2$ = 44 g/mol)

For a first-order reaction, the rate constant $ k $ is $ 1.386 \times 10^{-3} \, \text{s}^{-1} $. What is the half-life $ t_{1/2} $ of the reaction? (Use $ \ln 2 = 0.693 $)

For the reaction $ \text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\text{NH}_3(g) $ at 298 K, the enthalpy change $ \Delta H = -92.4 \, \text{kJ/mol} $. What happens to the equilibrium when temperature is increased?

In a redox titration, 25 mL of 0.1 M KMnO$_4$ is required to completely react with oxalic acid in acidic medium. The volume of 0.2 M oxalic acid used is:
(Balanced reaction: $ 2\text{MnO}_4^- + 5\text{C}_2\text{O}_4^{2-} + 16\text{H}^+ \rightarrow 2\text{Mn}^{2+} + 10\text{CO}_2 + 8\text{H}_2\text{O} $)

The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidizing capacity.

The major product formed when 2-bromo-2-methylbutane is treated with alcoholic KOH is:

What is the normality of a solution containing 4.9 g of $ \text{H}_2\text{SO}_4 $ in 500 mL of solution? (Molar mass of $ \text{H}_2\text{SO}_4 $ = 98 g/mol)

For a first-order reaction, the concentration of a reactant decreases from 0.8 M to 0.4 M in 20 minutes. What is the half-life of the reaction? (Use $\ln 2 = 0.693$)

In neutral medium, permanganate reacts with iodide to give:

The standard reduction potentials are: $ E^\circ_{\text{Ag}^+/\text{Ag}} = +0.80\, \text{V} $ and $ E^\circ_{\text{Cu}^{2+}/\text{Cu}} = +0.34\, \text{V} $. What will happen when a copper rod is placed in a solution of silver nitrate?

The nitration of benzene using a mixture of concentrated $\mathrm{H_2SO_4}$ and concentrated $\mathrm{HNO_3}$ gives:

Which of the following complexes will exhibit optical isomerism?

The reaction sequence given below is carried out with 16 moles of X. The yield of the major product in each step is given below the product in parentheses. The amount (in grams) of S produced is ____.

Use: Atomic mass (in amu): H = 1, C = 12, O = 16, Br = 80

Match List - I with List - II.

What is the molar concentration of hydrogen ions in a solution of $ 0.1 \, \text{M} $ $ \text{HCl} $?

How many atoms are present in 1 mole of oxygen gas (O₂)?

For a reaction: $ A + B \rightarrow \text{Products} $ It is found that doubling the concentration of A doubles the rate, while doubling B increases the rate fourfold. What is the overall order of the reaction?