List of top Chemistry Questions

The products A and B in the following reactions, respectively, are: 

Statement – 1: First ionization energy of Ge is greater than Si.
Statement – 2: First ionization energy of Pb is greater than Sn.
When ethane-1,2-diamine is progressively added to aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be:
The conditions and consequences that favour the \( t_{2g}^6 e_g^1 \) configuration in a metal complex are
Sulfur undergoes oxidation to form sulfur trioxide (SO$_3$) and sulfur dioxide (SO$_2$) in the following reactions:
1. \( \text{S} + \text{O}_2 \to \text{SO}_2 \)
2. \( 2\text{SO}_2 + \text{O}_2 \to 2\text{SO}_3 \)
Given that sulfur (S) is oxidized to SO$_2$, and SO$_2$ is further oxidized to SO$_3$, calculate the change in oxidation states of sulfur in both reactions.
81 g of Al reacts with 128 g of \( O_2 \). Calculate the amount of \( Al_2O_3 \) produced.
The atomic number of the element with the least melting point in group 14 is:
Alpha-helix and beta-sheet protein structures belong to which category of structure?
If 2 g phenol is allowed to react with \( \text{Br}_2/\text{H}_2\text{O} \), how much \( \text{Br}_2 \) will be required to produce 2,4,6-tribromophenol (rounded to the nearest integer)?
Calculate the percentage by weight of S if 160 grams of organic compound produce 466 grams of BaSO₄.
Which of the following react with Hinsberg reagent?
Statement 1: Fructose can give Tollens' test even though it does not have an aldehyde group.
Statement 2: When reacted with base, fructose can undergo rearrangement to produce an aldehyde group.
Which of the following can show face-mer isomerism?
Which of the following elements doesn't lie on the same period?

Consider the complex \( [Cu(NH_3)_4]^{2+} \). Which of the following statements is correct about this complex?

The coefficients of thermal conductivity are given as: \[ K_1 = 60 W/m^\circ C, K_2 = 120 W/m^\circ C, K_3 = 135 W/m^\circ C \] The temperature at the leftmost end is 100°C and the rightmost end is 0°C. Find the temperature \( \theta \) at the junction.
How many compounds have a linear shape among \( \text{SO}_2 \), \( \text{BeCl}_2 \), \( \text{N}_3^- \), \( \text{I}_3^- \), \( \text{NO}_2^+ \), \( \text{NO}_2 \)?
Which of the following has the maximum size?
Find the dimensions of \( \frac{B}{\mu_0} \)
Compare boiling point of given solutions:
(i) \( 10^{-4} \) NaCl
(ii) \( 10^{-3} \) NaCl
(iii) \( 10^{-2} \) NaCl
(iv) \( 10^{-4} \) urea
What is the hybridization of the central atom in the molecule \( \text{SO}_3 \)?
In an oxidation-reduction reaction, what happens to the oxidation state of the central atom in \( \text{MnO}_4^- \) when it is reduced to \( \text{Mn}^{2+} \)?
In the reaction \( 2\text{H}_2\text{O}_2 \rightarrow 2\text{H}_2\text{O} + \text{O}_2 \), what is the role of potassium iodide (KI) in this reaction?
What is the shape of the \( \text{ClO}_2^- \) ion according to VSEPR theory?
Why is the ability of oxygen greater than fluorine to stabilise higher oxidation states of transition metals?