List of top Chemistry Questions

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
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
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?
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?
Reagents and compound to convert ethyl bromide → 2-butanone:
X and Y in reactions:
Isopentyl alcohol reacts with reagent X → carboxylic acid → decarboxylation → Y. Reaction of Y with Z → t-butyl alcohol. Identify X and Z.
Statement I: Boiling point of diethyl ether < 1-butanol.
Statement II: Diethyl ether miscible with water to almost same extent as 1-butanol.
What are X and Y in the following reaction sequence?
Identify the correct antibiotic set:
Source for vitamin C and vitamin E respectively are:
Arrange the following polymers in increasing order of intermolecular forces:
IUPAC name of [Co(NH$_3$)$_4$(H$_2$O)Cl]Cl$_2$ is:
Change in oxidation state of sulphur during oxidation of thiosulphate ion in neutral/alkaline solution by KMnO$_4$ is:
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?
Freundlich adsorption isotherm: log(mx) vs log(p) increases then flattens (points C-D). Experimental condition represented by C-D?
First order reaction (A→P) with slopes mA, mB, mC at points A, B, C. Identify correct order.
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.
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)
Identify the crystal system in which body-centered lattice is not present.
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'.