List of top Chemistry Questions

The oxide of nitrogen, 'X' is a blue solid and is acidic in nature. \( X \) is
Formic acid on heating with concentrated H\(_2\)SO\(_4\) at 373 K gives X, a colourless substance and Y, a good reducing agent. The number of \(\sigma\) and \(\pi\) bonds in X, Y are respectively:
If the density of a mixture of nitrogen and oxygen gases at 400 K and 1 atm pressure is 0.920 g L\(^{-1}\), what is the mole fraction of nitrogen in the mixture?

The standard electrode potentials \( E^\circ (V) \) for \( Li^+/Li \), \( Na^+/Na \) respectively are:

(1) −3.04, −2.714
(2) −2.714, −3.04
(3) −3.04, −3.04
(4) −2.714, −2.714

In which of the following ionic pairs, the second ion is smaller in size than the first ion?

Observe the following formula 

 The groups/atoms in the plane of the paper are

The IUPAC names of the compounds A and B respectively are

 

Which of the following does not exist?

Identify the sets containing isostructural molecules from the following 

I. \(\text{SiF}_4\), \(\text{SF}_4\)
II. \(\text{IO}_3^-\), \(\text{XeO}_3\)
III. \(\text{BH}_4^-\), \(\text{NH}_4^+\)
IV, \(\text{PF}_6^-\), \(\text{SF}_6\)
The correct option is

Arrange the following halides in decreasing order of their reactivity towards dehydrohalogenation:
decreasing order of their reactivity towards dehydrohalogenation

In the following reaction sequence X and Y respectively are

Identify the structure of the polymer ‘P’ formed in the given reaction: 

 A few sols are given below:
As2S3 sol, starch sol, Al2O3 ·
xH2O sol, TiO2 sol, gold sol, congo red sol, blood, methylene blue sol, CdS sol
The number of positively charged sols in the above list is:

The number of -OH groups present in the structures of bithionol, terpineol, and chloroxylenol is respectively:

The metal having the highest melting point among lanthanides is

Match the following: List I (Ore) List II (Composition) 
 

Which radical is responsible for depletion of ozone in stratosphere?

The reagent 'X' used in the following reaction to obtain a good yield of the product is: 

The number average molecular weight (M\(_n\)) of a polymer is 1500. In this polymer, 800 molecules of molar mass 1000, 100 molecules of molar mass 2000 and x molecules of molar mass 5000 are present. What is the value of x?
Observe the following statements
Statement I : Ca(OH)$_2$; is used in white wash
Statement 11 : \(CaCO_3\) is used as mild abrasive in tooth paste
Identify the correct statements from the following:
I. \(\text{In}_2\text{O}_3\) is a basic oxide.
II. \(\text{TiCl}_2\) is more ionic in nature than \(\text{TiCl}_3\).
III. Boron reacts with dinitrogen at high temperature to form BN.

The wavelength of an electron is \( 10^3 \) nm. What is its momentum in kg m s\(^{-1}\)?

The wavenumbers of the first three emission lines of Lyman series of hydrogen spectrum are respectively \( \nu_1, \nu_2, \nu_3 \). Similarly, the wavenumbers of first three emission lines of Balmer series of hydrogen spectrum are \( \nu_4, \nu_5, \nu_6 \), respectively. Identify the correct relationship:
Which of the following gives proof of quantized electronic energy levels in hydrogen atom?

The variation of volume of an ideal gas with its number of moles (\( n \)) is obtained as a graph at 300 K and 1 atm pressure. What is the slope of the graph?