List of top Chemistry Questions

Which of the following have undistorted octahedral structures?
1. $S{F}_6$
2. $P{F}_6^{-}$
3. $Si{F}_6^{2-}$
4. $Xe{F}_6$
Select the correct answer using the codes given below:

At equilibrium the concentrations of ${\mathrm{N}}_2=3.0\times {10}^{-3}\mathrm{M},{\mathrm{O}}_2=4.2\times {10}^{-3}\mathrm{M}$ and $\mathrm{NO}=2.8\times {10}^{-3}\mathrm{M}$ in a sealed vessel at $800\mathrm{K}$. What will be ${\mathrm{K}}_{\mathrm{C}}$ for the reaction ${\mathrm{N}}_{2(\mathrm{g})}+{\mathrm{O}}_{2(\mathrm{g})}\leftrightharpoons 2{\mathrm{NO}}_{(\mathrm{g})}?$

Consider the following reaction scheme and choose the correct option(s) for the major products Q, R and S.

The numerical value of N/n (where N is the number of molecules in a given sample of gas and n is the number of moles of the gas) is

Of the three molecules $XeF_4, SF_4 ,SiF_4$ one which have tetrahedral structures is

How can photochemical smog be controlled?

Thermoplastics are:

Highest oxidation state of $Mn$ is exhibited in $Mn _2 O _7$ The correct statements about $Mn _2 O _7$ are
(A) Mn is tetrahedrally surrounded by oxygen atoms
(B) $Mn$ is octahedrally surrounded by oxygen atoms
(C) Contains $Mn-O-Mn$ bridge
(D) Contains $Mn - Mn$ bond
Choose the correct answer from the options given below:

Choose the correct statement(s):
A Beryllium oxide is purely acidic in nature
B Beryllium carbonate is kept in the atmosphere of $CO _2$
C Beryllium sulphate is readily soluble in water
D Beryllium shows anomalous behavior
Choose the correct answer from the options given below:

A sample of drinking water was found to be severely contaminated with chloroform \((CHCl_3)\) supposed to be a carcinogen. The level of contamination was 15ppm (by mass):
(i) express this in percent by mass
(ii) determine the molality of chloroform in the water sample.