List of top Chemistry Questions

State Kohlrausch’s law. Give any two applications of it.

Represent the cell in which the following reaction takes place:
\text{Mg(s)} + 2Ag^{+} (0.001 M) \rightarrow \text{Mg}^{2+} (0.100 M) + 2Ag(s)
Calculate E_{cell} if E^\circ_{cell} = 3.17 V. (log 10 = 1)

Arrange the following in the increasing order of their pKₓ value in aqueous phase:
C₆H₅NH₂, (CH₃)₂NH, NH₃, CH₃NH₂, (CH₃)₃N

In a chemistry practical class, the teacher gave his students an amine 'X' having molecular formula C₂H₇N, and asked the students to identify the type of amine. One of the students, Neeta, observed that it reacts with C₆H₅SO₂Cl, to give a compound which dissolves in NaOH solution. Can you help Neeta to identify the compound 'X'?

Given that \( \Lambda^\circ_{\text{m}} \) for NH₄Cl, NaOH, and NaCl are 129.8, 217.4, and 108.9 S cm² mol⁻¹ respectively. The molar conductivity of a 1 × 10⁻² M solution of NH₄OH is 9.33 S cm² mol⁻¹. Calculate the degree of dissociation (\( \alpha \)) of the NH₄OH solution at this concentration.

For a galvanic cell, the following half reactions are given. Decide, which will remain as reduction reaction and which will be reversed to become an oxidation reaction. Give reason for your answer.
(I) Cr³⁺ + 3e⁻ → Cr(s); E° = −0.74 V
(II) Fe²⁺ + 2e⁻ → Fe(s); E° = −0.44 V

Write any two differences between DNA and RNA.

Anisole is treated with HBr.

Arrange the following compounds in the increasing order of their acidic strength:
3,5-dinitrophenol, 4-methylphenol, phenol, 2,4,6-trinitrophenol.

What happens when: (i) Phenol is distilled with Zn dust?

Explain why in tetrahedral coordination entities, low-spin configurations are rarely observed.

Name the type of linkage responsible for the formation of proteins from $\alpha$-amino acids.

Account for the following:
(a) The C–Cl bond length in chlorobenzene is shorter than that in methyl chloride.
(b) Grignard reagents should be prepared under anhydrous conditions.
(c) In case of optically active alkyl halides, S_N1 reactions are accompanied by racemisation.

Write an application of reverse osmosis.

What is meant by crystal field splitting energy? For a d4 ion, write the configuration if (i) $\Delta_o$<P, and (ii) $\Delta_o$>P.

For the reaction A + B $\to$ Products, the following initial rates were obtained at various initial concentrations of reactants:

Sl. No.	[A] (mol L-1)	[B] (mol L-1)	Initial rate (mol L-1 s-1)
1	0.1	0.1	0.05
2	0.2	0.1	0.10
3	0.1	0.2	0.05

How can acetaldehyde be prepared from acetyl chloride?

What happens when red blood cells are kept in 0.5\% (mass/vol) NaCl solution? Justify your answer.

How does sprinkling of salt help in clearing the snow covered roads in hilly areas?

Shweta mixed two liquids A and B of 10 mL each. After mixing, the volume of the solution was found to be 20.2 mL.
(i) Why was there a volume change after mixing the liquids?
(ii) Will there be an increase or decrease of temperature after mixing?
(iii) Give one example for this type of solution.

Based on the data given above, give plausible reason for the variation of conductivity and molar conductivity with concentration.

Concentration of KCl solution (mol/L)	Conductivity at 298.15 K (S cm-1)	Molar Conductivity at 298.15 K (S cm2 mol-1)
1.000	0.1113	111.3
0.100	0.0129	129.0
0.010	0.00141	141.0

Explain the mechanism of acyl catalytic hydrogenation.

Write the rate law expression for the reaction 2HI → H2 + I2, if the order of the reaction is zero.

Assertion (A): The boiling points of alkyl halides decrease in the order $R_1>R_3>R_2>R_4$.
Reason (R): The van der Waals forces of attraction decrease in the order $R_1>R_3>R_2>R_4$.