List of top Chemistry Questions

Choose the correct statement:
Which one is not correct mathematical equation for Dalton's Law of partial pressure? Here p = total pressure of gaseous mixture

The equilibrium concentrations of the species in the reaction A+B\(\to\)C+D are 2, 3, 10 and 6 mol L–1, respectively at 300 K. ΔGº for the reaction is (R = 2 cal/mol K)

A compound is formed by two elements A and B. The element B forms cubic close packed structure and atoms of A occupy \(\frac 13\) of tetrahedral voids. If the formula of the compound is A,By. then the value of x +y is in option

Which of the following is not an EWG (Electron Withdrawing Group)?
CrO$_3$ is _____ oxide?

Radius order of \(Yb^{3+}, La^{3+}\), \(Ce^{3+}\), \(Pm^{3+}\)?

If the mean kinetic energy of Helium is 5000 J at 400 K, then the kinetic energy of neon at 800 K is
Increasing ionic radii of lanthanoids having +2 oxidation state?
For a first-order reaction, if the rate constant is \( k = 6.93 \times 10^{-3} \), what is the half-life (\( t_{1/2} \)) of the reaction?
Which of the following have undistorted octahedral structures?
1. SF6
2. PF6-
3. SiF62-
4. XeF6
Select the correct answer using the codes given below:

In the given reaction Product A is:

At equilibrium the concentrations of N2=3.0×10−3M,O2=4.2×10−3M and NO=2.8×10−3M in a sealed vessel at 800 K. What will be KC for the reaction N2( g)+O2( g)⇋2NO(g)?
Consider the following reaction scheme and choose the correct option(s) for the major products Q, R and S.
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:
Write the resonance structures for SO3 , NO2 and NO3-
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.
In the electrolysis of molten NaCl, the product obtained at the cathode is:
Rosenmund reduction is used to convert acyl chlorides into:
What is the pH of a \( 0.001 \, \text{M} \) solution of \( \text{NaOH} \)?