List of top Chemistry Questions

What is the pH of 0.365% (w/V) HCl aqueous solution? (HCl=36.5 u), (log 0.365=−0.4377)
The volume (in L) of CO2(g) obtained at STP by completely burning 10 g of 90% pure CaCO3 is approximately (molar volume of CO2 at STP=22.7L) (Assume CO2 as an ideal gas) (CaCO3=100u)
The slope of isobar of one mole of an ideal gas at p (atm) is 0.082 L K$^{-1}$. What is the value of p in atm? (R=0.082 L atm mol$^{-1}$K$^{-1}$)
The pair of molecules having same number of lone pair of electrons on central atom is
Which of the following statement is not correct?
Identify the number of metalloids from the following: Sb, Be, P, Ge, Te, S, Cs, Tc, I
In long form of periodic table an element 'X' is present in group 'Y' in which Mn is also an element. X, Y respectively are
At T(K) 10 L of an ideal gas was expanded to 12 L against a pressure of 2 atm irreversibly. What is the work done by the gas?
In Hydrogen atom, an electron jumped from an orbit of radius 2592.1 pm to another orbit of radius 211.6 pm. What is the energy difference (in J) between these two states?
Observe the elements from H(Z=1) to Ca(Z=20). The number of elements with 1, 2 and 3 unpaired electrons in their ground state is respectively
Reagents and compound to convert ethyl bromide → 2-butanone:
An amine X (C4H11N) on heating with CHCl3 in ethanolic KOH forms a foul-smelling substance. Product of other amine Y (C4H11N) and benzenesulphonyl chloride is insoluble in alkali. What are X and Y respectively?
Identify the correct antibiotic set:
Arrange the following polymers in increasing order of intermolecular forces:
Statement I: Boiling point of diethyl ether < 1-butanol.
Statement II: Diethyl ether miscible with water to almost same extent as 1-butanol.
X and Y in reactions:
What are X and Y in the following reaction sequence?
Source for vitamin C and vitamin E respectively are:
Isopentyl alcohol reacts with reagent X → carboxylic acid → decarboxylation → Y. Reaction of Y with Z → t-butyl alcohol. Identify X and Z.
IUPAC name of [Co(NH$_3$)$_4$(H$_2$O)Cl]Cl$_2$ is:
Assertion (A): The order of acidic strength of hydrogen halides in aqueous solution is HF < HCl < HBr < HI.
Reason (R): The order of bond dissociation enthalpy of hydrogen halides is HF > HCl > HBr > HI.
Among noble gases, the most abundant one in atmosphere is:
Change in oxidation state of sulphur during oxidation of thiosulphate ion in neutral/alkaline solution by KMnO$_4$ is:
Freundlich adsorption isotherm: log(mx) vs log(p) increases then flattens (points C-D). Experimental condition represented by C-D?
In which of the following, metal is not correctly matched with its refining process?