List of top Chemistry Questions

Write any two differences between globular and fibrous proteins

Identify P, Q and R in the following reaction sequence:
\[ P \xrightarrow{\text{NH}_3} \text{CH}_3\text{COO}^- \text{NH}_4^+ \xrightarrow{\Delta} Q \xrightarrow{\text{PCl}_5} R \]

Give a method to separate o-nitrophenol and p-nitrophenol. Explain the principle involved.

Liquids ‘X’ and ‘Y’ form an ideal solution. The vapour pressure of pure ‘X’ and pure ‘Y’ are 120 mm Hg and 160 mm Hg respectively. Calculate the vapour pressure of the solution containing equal moles of ‘X’ and ‘Y’.

Write an equation for Clemensen reduction

Among the following, which will have inversion of configuration on reaction with aqueous alkali and why?
(i) 1-chloropropane
(ii) 2-chloro-2-methylpropane

Which of the following (A) or (B) will be the major product in the reaction given below? Give a suitable reason for your answer.
\[ \text{CH}_3\text{CH}_2\text{CH}_2\text{Br} + \text{KOH} \rightarrow \]

Based on Valence Bond Theory, explain the geometry and magnetic character of [NiCl$_4$]$^{2-$. [Atomic number: Ni = 28]}

Draw the possible isomers of:
\[ [ \text{Co}(\text{en})_2\text{Cl}_2 ]^+ \]

Write the chemical equation for Williamson’s synthesis.

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

Reaction Rate Data

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

Write the mechanism of dehydration of ethyl alcohol with conc. H$_2$SO$_4$ at 413 K.

Give Reasons:
(I) $ \text{Ce}^{4+} $ in aqueous solution is a good oxidising agent.
(II) The actinoid contraction is greater from element to element than lanthanoid contraction.
(III) $ E^\circ_{\text{M}^{2+}/\text{M}} $ value is more negative than expected, whereas $ E^\circ_{\text{Cu}^{2+}/\text{Cu}} $ is positive.

Convert aniline to:
(I) benzene
(II) sulphanilic acid

Identify the reaction order which has a rate constant of 4.5 × 10−5 L mol−1 s−1.

Give a simple chemical test to distinguish between 3-pentanol and 2-pentanol.

Give reasons for the following:
(I) Transition metals exhibit catalytic properties.
(II) Transition metals have high melting points.
(III) Zn is a transition element, while Zn is not

When pyrolusite ore is fused with KOH, in presence of air, a dark green coloured product ‘A’ is obtained which changes to purple coloured compound ‘B’ in acidic medium.
(II) Write the formulae of ‘A’ and ‘B’.

Define rate constant.

Mention any other consequence of Lanthanide Contraction

Identify A and B in the following reactions: