List of top Chemistry Questions

The oxidation number of Co in complex \( [Co(H_2NCH_2CH_2NH_2)_3]_2(SO_4)_3 \) is?

The gold number range of some of the lyophilic colloids is given below: 
A: 0.005 - 0.01,  B: 0.15 - 0.25,  C: 0.04 - 1.0,  D: 15 - 25.

The total number of ions produced from the complex \( [Cr(NH_3)_6]Cl_3 \) in aqueous solution will be?
Which of the following compounds will be repelled when placed in an external magnetic field?

Arrange the following in decreasing order of number of molecules contained in:
(A) 16 g of \( O_2 \) 
(B) 16 g of \( CO_2 \) 
(C) 16 g of \( CO \) 
(D) 16 g of \( H_2 \) 

Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil. HCl is Given : Molar mass of Mg is 24 g mol\(^{-1}\).
The mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dilute HCl is: (Given molar mass of Mg = 24 g/mol)

Assertion (A): [Cr(H_2O)_6]Cl_2 and [Fe(H_2O)_6]Cl_2 are examples of homoleptic complexes. 
Reason (R): All the ligands attached to the metal are the same.

Arrange the following compounds in increasing order of their boiling points:
 increasing order of their boiling points

The correct IUPAC name of \([ \text{Pt}(\text{NH}_3)_2\text{Cl}_2 ]^{2+} \) is:

Acidified \(KMnO_4\) oxidizes sulphite to: 

For the reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g), the equilibrium constant Kc is 0.5 at 400 K. If [N₂] = 0.1 M, [H₂] = 0.2 M, and [NH₃] = 0.05 M, what is the reaction quotient Qc?
Which of the following molecules has a trigonal planar molecular geometry?
A gas undergoes an isothermal process at 300 K, and its volume increases from 2 L to 4 L. If the initial pressure is 2 atm, what is the work done by the gas? (R = 8.314 J/mol·K, assume 1 mole)
Arrange the following bases in increasing order of their basic strength:

Sodium hydroxide
Magnesium hydroxide
Aluminium hydroxide
Ammonium hydroxide
Select the correct answer using the code given below:
Ammonia evolved from \(0.75\,\text{g}\) of the soil sample in the Kjeldahl’s method for nitrogen estimation neutralises \(10\,\text{mL}\) of \(1\,\text{M}\) \(H_2SO_4\). Find the percentage of nitrogen present in the soil.
Which of the following is liquid at ordinary temperature?
The main constituent of vinegar is:
The correct order of increasing chemical reactivity of the following metals is:
The early attempt to classify elements as metals and non-metals was made by:
The long form of the periodic table consists of:
Which of the following pair is/are correctly matched?

Isotopes : Atoms with same atomic number but different atomic mass
Isobars : Atoms with same number of neutrons but different atomic number
Isotones : Atoms with same mass number but different atomic number
Select the correct answer using the code given below:
The rusting of an iron nail:
The octet rule is not valid for which one of the following molecules?
Which one of the following salts when dissolved in water makes the solution basic?