List of top Chemistry Questions

Which one of the following is the correct statement?

Toluene when reacted with \( \text{Cl}_2 \) gas at 385 K forms a product X which undergoes further reaction with Sodium ethoxide to yield product Y. The structure of Y is ............

Which one of the following is the major product formed when the given reaction occurs?
\[ \text{C}_6H_5\text{OCH}_2\text{CH}_3 + \text{excess conc. HCl} \xrightarrow{373K} \]

Identify the incorrect statement.

Two statements, One Assertion and the other Reason, are given. Which one of the following options is correct?
Assertion: The acid strength of 4 compounds in the descending order is p-Nitrophenol \( > \) p-Methoxyphenol \( > \) Phenol \( > \) p-chlorophenol.
Reason: Electron withdrawing groups increase the acid strength while Electron donating groups decrease the acid strength of Phenol and its derivatives.

Which one of the following structures in Column I does not have the correct IUPAC name as given in Column II?

When 0.4 g CH\(_3\)COOH is added to 40 g of Benzene to form a solution, the freezing point is depressed by 0.45°C. If Acetic acid undergoes dimerisation in Benzene (K\(_f\) = 5.12 K kg/mol), what is the percentage association of the acid in Benzene?

Arrange the following ions in the decreasing order of covalent double bonds formed by the transition metal with oxygen. \[ A. = \text{chromate}, \quad B = \text{permanganate}, \quad C = \text{dichromate} \]

Two subatomic particles 1 and 2, with the same kinetic energies, have their de-Broglie wavelengths as \( \lambda_1 \) and \( \lambda_2 \) and masses as 3 m and 6 m respectively. Determine the ratio \( \lambda_1 : \lambda_2 \).

Identify X and Y formed in the following two reactions.
\[ (i) \, \text{Decan-1-ol} \xrightarrow{\text{Jones reagent}} X \]
\[ (ii) \, \text{Sodium salt of X} \xrightarrow{\text{NaOH/CaO,} \Delta} Y \]

Choose the incorrect statement.

Choose the incorrect statement from the following.

For a hypothetical chemical reaction \( A_2 + 3B_2 \rightarrow 2AB_3 + \text{Heat} \), which one of the following combinations of state variables would support the spontaneity of the reaction at a particular temperature?

Which one of the following compounds will give a yellow precipitate when reacted with \( I_2/\text{NaOH} \)?

Which is the correct order of increasing number of unpaired electrons in the following ions?
\( A = \text{Cr}^{2+} \, (Z = 24), \quad B = \text{Cu}^{2+} \, (Z = 29), \quad C = \text{Ni}^{2+} \, (Z = 28), \quad D = \text{Fe}^{3+} \, (Z = 26) \)

From among the 4 given compounds identify the compounds which possess a net dipole moment.

Which one of the following is incorrect?

Larger number of oxidation states are exhibited by the actinoids than those of lanthanoids. The reason is:

A dilute solution of \( K_2HgI_4 \) reagent is 95% ionised. What would be the approximate value of its van't Hoff factor?

Given below are 2 statements: one Assertion and the other Reason. Which of the following options is correct?
Assertion: Sulphur dioxide and Hydrogen peroxide can act as both oxidising and reducing agents but Nitric acid can act as only an oxidising agent.
Reason: Sulphur and Oxygen can exhibit more than one stable oxidation states while Nitrogen does not.

Choose the statements which are incorrect in the case of Lanthanoids.

The hydrogenation of Ethyne is carried out at 600 K. The same reaction when carried out in the presence of a catalyst maintaining the same rate constant, the temperature required is only 400 K. If the catalyst lowers the Activation energy of the reaction by 20 kJ/mol, what is the value of \( E_a \)?

A current of 1.5 A is passed for 2 hours through an aqueous solution of PdX\(_n\), where X is a monovalent anion. During the electrolysis process 2.977 g of Palladium metal gets deposited at the cathode. Calculate the charge on Pd ions. (Atomic mass of Pd = 106.4 g/mol).

The time needed for completion of 80% is \( y \) times the half-life period of a first order reaction. What is the value of \( y \)?

What would be the cell potential for the Galvanic cell which is represented by the electrochemical reaction: \[ 2 \text{Cr(s)} + 3 \text{Fe}^{2+} (0.02M) \rightarrow 2 \text{Cr}^{3+} (0.2M) + 3 \text{Fe} \] \[ E^{0}_{\text{Fe}^{2+}/\text{Fe}} = -0.42 \, \text{V}, \quad E^{0}_{\text{Cr}^{3+}/\text{Cr}} = -0.72 \, \text{V} \]