List of top Chemistry Questions

Of the following, which species is primarily obtained in a solution containing $ KHF_2 $ ?
No work is done on the system, but $ q $ amount of heat is taken out from the system and given to the surroundings. Express the change in internal energy $ (\Delta U) $ of this system and what type of wall does the system have ?
Methemoglobinemia is caused due to the presence of in excess of which of the following in drinking water?
$KMnO_4$ on reaction with KOH does not give
In van der Waals equation at constant temperature 300 K, if a = 1.4 atm L mol, V = 100 mL, n = 1 mole, then what is the pressure of the gas?
In acidic medium, which of the following becomes colourless?
Gas in a cylinder is maintained at $10 \,atm$ pressure and $300\, K$ temperature. The cylinder will explode if pressure of gas goes beyond $15\, atm$. What is the maximum temperature to which gas can be heated?
F-centre is
Zone refining is based on the solubility of impurities in the molten state than in the solid state of the metal. Pure metal oxide is obtained in zone refining.
$Si??i$ bonds are much stronger than $Si??$ bonds. Silicon forms double bonds with itself.
$Pb_3O_4$ reacts with $HNO_3$ and forms $PbO_2$. Lead is stable in $+4$ oxidation state.
Oxidation state of hydrogen is +1 in $H_2O$ while -1 in $CaH_2$. $CaH_2$ is a metal hydride and for hydrides, hydrogen is assigned the oxidation number of -1.
Oxidation of glucose by $Br_2$-water gives saccharic acid. $Br_2$-water oxidises ??HO and ??H group.
On passing electric current in colloidal solution they do not move towards anode or cathode. They do not contain any charge.
Metal deficiency defect can be seen in $FeO$. $Li$ compound (LiCl) has pink colour due to F-center.
Due to Frenkel defect, there is no effect on the density of the crystalline solid. In Frenkel defect, no cation or anion leaves the crystal.
$Al$ forms $[AlF_6]^{3-}$ but B does not form $[BF_6]^{3-}$. $B$ does not react with $F_2$.
Which of the following acts as a nucleophile in the aldol condensation of ethanal? (i) OH $\quad\quad$ (ii) H? : (iii) CHCHO
During the fusion of organic compound with sodium metal, nitrogen present in the organic compound is converted into
The final product of the given reaction is
Which of the following order is correct?
Which of the following exhibits minimum number of oxidation states?
In which of the following elements number of d-electrons is zero in 6d-orbital?
Which of the following contains atleast one lone pair in all of its halides?
Major product of the given reaction is