List of top Chemistry Questions

In liquation process used for tin (Sn), the metal

Which of the following 3d-metal ion will give the lowest enthalpy of hydration (Δ_hydH) when dissolved in water?

Given below are the quantum numbers for 4 electrons.
A. n=3, l=2, ml=1,m_s=+$\frac{1}{2}$
B. n=4, l=1, ml=0,m_s=+$\frac{1}{2}$
C. n=4, l=2, ml=–2,m_s=–$\frac{1}{2}$
D. n=3, l=1, ml=–1,m_s=+$\frac{1}{2}$
The correct order of increasing energy is

C(s)+O₂(g)→CO₂(g)+400 kJ
C(s)+$\frac{1}{2}$ O₂(g)→CO(s)+100 kJ
When coal of purity 60% is allowed to burn in presence of insufficient oxygen, 60% of carbon is converted into ‘CO’ and the remaining is converted into ‘CO₂’. The heat generated when 0.6 kg of coal is burnt is _______.

The number of points, where the function $f: \mathbb{R} \to \mathbb{R}$, $$ f(x) = |x - 1|\cos|x - 2|\sin|x - 1| + (x - 3)|x^2 - 5x + 4|, $$ is NOT differentiable, is

Given below are the critical temperatures of some of the gases :

Gas	Critical temperature (K)
He	5.2
CH₄	190.0
CO₂	304.2
NH₃	405.5

The gas showing least adsorption on a definite amount of charcoal is

Identify the incorrect statement from the following.

Which compound amongst the following is not an aromatic compound?

Which amongst the following is incorrect statement?

At 298 K, the standard electrode potentials of Cu²⁺/Cu, Zn²⁺/Zn, Fe²⁺/Fe and Ag⁺/Ag are 0.34 V, - 0.76 V, - 0.44 V and 0.80 V, respectively.
On the basis of standard electrode potential, predict which of the following reaction cannot occur?

Assertion (A): In a particular point defect, an ionic solid is electrically neutral, even if few of its cations are missing from its unit cells.
Reason(R): In an ionic solid, Frenkel defect arises due to dislocation of cation from its lattice site to interstitial site, maintaining overall electrical neutrality.
Choose the most appropriate answer from the options given below:

Which will have the highest enol content?

Consider the above reaction sequence and identify the product B.

The formulas of A and B for the following reaction sequence are

The number of molecules(s) or ions(s) from the following having non-planar structure is ____.
$NO^-_3, H_2O_2, BF_3, PCl_3, XeF_4, SF_4, XeO_3, PH^+_4, SO3,[Al(OH)_4]^-$

In the above reaction, 5 g of toluene is converted into benzaldehyde with 92% yield. The amount of benzaldehyde produced is______ × 10^–2 g. (Nearest integer).

0.01 M KMnO₄ solution was added to 20.0 mL of 0.05 M Mohr’s salt solution through a burette. The initial reading of 50 mL burette is zero. The volume of KMnO₄ solution left in burette after the end point is _____ml. [nearest integer]

Consider the above reaction and predict the major product.

The correct sequential order of the reagents for the given reaction is

In base vs acid titration, at the endpoint methyl orange is present as

For the decomposition of azomethane, CH₃N₂CH₃(g) → CH₃CH₃(g) + N2(g), a first-order reaction, the variation in partial pressure with time at 600 K is given as
The half-life of the reaction is ______ × 10^–5s. [Nearest integer]

In the above reaction product B is:
Product B is

Among the following structures, which will show the most stable enamine formation?
(Where Me is –CH₃)

[A] → [B]
Reactant Product
If formation of compound [B] follows the first order of kinetics and after 70 minutes the concentration of [A] was found to be half of its initial concentration. Then the rate constant of the reaction is x × 10^–6 s^–1. The value of x is _________. (Nearest Integer).

In a linear tetrapeptide (constituted with different amino acids) – (number of peptide bonds) is _____.