List of top Chemistry Questions

N\(_2\) exerts partial pressure of 7.698 bar in 1L water at 298K. What is the mole fraction of N\(_2\) in the solution? Given that N\(_2\) = 76.48K bar.

Match List-I with List-II: List-I

Which is a heterocyclic compound?
Consider the last electron of an element having atomic number $9$ and choose the correct option.
Butane reacts with oxygen to produce carbon dioxide and water following the equation given below:
$ C_4H_{10}(g) + \frac{13}{2} O_2(g) \rightarrow 4CO_2(g) + 5H_2O(l) $ If 174.0 kg of butane is mixed with 320.0 kg of $ O_2 $, the volume of water formed in litres is _____. (Nearest integer)
[Given: (a) Molar masses: C = 12, H = 1, O = 16 g $ mol^{-1} $; (b) Density of water = 1 g $ mL^{-1} $]
In Dumas' method 292 mg of an organic compound released 50 mL of nitrogen gas ($ N_2 $) at 300 K temperature and 715 mm Hg pressure. The percentage composition of 'N' in the organic compound is _____ % (Nearest integer) (Aqueous tension at 300 K = 15 mm Hg)
The extra stability of half-filled subshell is due to
(A) Symmetrical distribution of electrons
(B) Smaller coulombic repulsion energy
(C) The presence of electrons with the same spin in non-degenerate orbitals
(D) Larger exchange energy
(E) Relatively smaller shielding of electrons by one another
Identify the correct statements

Given below are two statements :

In the light of the above statements, choose the most appropriate answer from the options given below :

The number of optically active products obtained from the complete ozonolysis of the given compound is :

Match List-I with List-II

Choose the correct answer from the options given below :

'X' is the number of acidic oxides among $ VO_2, V_2O_3, CrO_3, V_2O_5 $ and $ Mn_2O_7 $. The primary valency of cobalt in $ [Co(H_2NCH_2CH_2NH_2)_3]_2 (SO_4)_3 $ is Y. The value of X + Y is :
In $ SO_2 $, $ NO_2^- $ and $ N_3^- $ the hybridizations at the central atom are respectively :
The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively : $ [Fe(CN)_6]^{3-}, [FeF_6]^{3-}, [CoF_6]^{3-}, [Mn(CN)_6]^{3-} $

Match List-I with List-II

Choose the correct answer from the options given below :

What is the molar volume of an ideal gas at standard temperature and pressure (STP)?
What is the pH of a solution with a \( \text{H}^+ \) concentration of \( 1 \times 10^{-3} \) mol/L?
Which of the following acids is a strong acid?
Which of the following is a characteristic property of acids?
Which of the following gases has the highest density at STP?
Which of the following is an example of a redox reaction?
What is the pH of a solution if the concentration of \( \text{H}^+ \) ions is \( 1 \times 10^{-5} \) mol/L?
What is the number of moles in 18 g of water (\( \text{H}_2\text{O} \))?
What is the molar mass of NaCl?

The total number of structural isomers possible for the substituted benzene derivatives with the molecular formula $C_7H_{12}$ is __

Among, Sc, Mn, Co and Cu, identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is _______BM (in nearest integer).