List of top Chemistry Questions

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?

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?

Arrange the following polymers in increasing order of intermolecular forces:

Isopentyl alcohol reacts with reagent X → carboxylic acid → decarboxylation → Y. Reaction of Y with Z → t-butyl alcohol. Identify X and Z.

What are X and Y in the following reaction sequence?

Identify the correct antibiotic set:

Source for vitamin C and vitamin E respectively are:

X and Y in reactions:

Statement I: Boiling point of diethyl ether < 1-butanol.
Statement II: Diethyl ether miscible with water to almost same extent as 1-butanol.

Freundlich adsorption isotherm: log(mx) vs log(p) increases then flattens (points C-D). Experimental condition represented by C-D?

Among noble gases, the most abundant one in atmosphere 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.

Match the following compounds with their uses:

In which of the following, metal is not correctly matched with its refining process?

Change in oxidation state of sulphur during oxidation of thiosulphate ion in neutral/alkaline solution by KMnO$_4$ is:

IUPAC name of [Co(NH$_3$)$_4$(H$_2$O)Cl]Cl$_2$ is:

At 298 K, equilibrium: M(s)+2Ag$^+$(aq)→M$^{2+}$(aq)+2Ag(s), K=10$^{15}$, ΔS=10 J/K. Find ΔrH (kJ/mol). FRT×2.303=0.06, F=96500 C/mol.

An alcohol 'X' (C$_4$H$_{10}$O) reacts with conc. HCl at room temperature and gives chloride. 'X' on dehydration followed by ozonolysis gives 'Y' and 'Z'. Find 'Y' and 'Z'.

X and Y in reactions:

Identify the crystal system in which body-centered lattice is not present.

Mole fraction of H$_2$SO$_4$ in aqueous solution is 0.9. Find mass % of H$_2$SO$_4$. (H=1, S=32, O=16 u)

IUPAC names of benzene derivatives are respectively:

The reaction/s which represent the production of diborane on an industrial scale is/are:
I. 4BF$_3$ + 3LiAlH$_4$ → 2B$_2$H$_6$ + 3LiF + 3AlF$_3$
II. 2NaBH$_4$ + I$_2$ → B$_2$H$_6$ + 2NaI + H$_2$
III. 2BF$_3$ + 6NaH → B$_2$H$_6$ + 6NaF

Increase in concentration of 'X' in blood of pregnant women who smoke may induce premature delivery. What is 'X'?