List of top Chemistry Questions

Which was the first organic compound synthesized in the laboratory ?
The metal most commonly used for making filament of an electric bulb is :
Which of the following is a member of the Halogen family ?
The gas which may cause explosion in coal mines is :
The most abundant gas found in the earth atmosphere is :
Select from the following a set of three metals which are found in free state :
Which of the following is the most electronegative element in the periodic table ?
The Chemical symbol for tin is :
During summer, water kept in an earthern pot becomes cool because of the phenomenon of :
A gel toothpaste is a mixture of a :
The compound that can be purified by sublimation is :
Calculate the normality of a solution obtained on mixing 100 ml of $\frac{M}{10} H_2 SO_4 , 50 \, ml$ of $\frac{N}{2} HNO_3$ and $25 \, ml $ of $\frac{N}{5} HCl$ solutions.
A 100 mL flask contained \(H_2\) at 200 torr, and a 200 mL flask contained \(He\) at 100 torr. The two flask were then connected so that each gas filled their combined volume. Assume, no change in temperature, total pressure is
The decreasing order of bond angles in $BF_{3} , NH_{3} , PF_{3}$ and $I_{3}{^{-}}$ is
The most polar compound among the following is :
The oxidation states of $Cr$ in $ [Cr(H_2O)_6]Cl_3, [Cr(C_6H_6)_2]$, and $K_2[Cr(CN)_2(O)_2(O_2)(NH_3)]$ respectively are :
Which of the following statements is false?
Hydrogen peroxide oxidises $[Fe(CN)6]^{4-}$ to $[Fe(CN)6]^{3-}$ in acidic medium but reduces $[Fe(CN)6]^{3-}$ to$[Fe(CN)6]^{4-}$ in alkaline medium. The other products formed are, respectively
The ratio of mass percent of $C$ and $H$ of an organic compound $\left( C _{ X } H _{ Y } O _{ Z }\right)$ is $6: 1 .$ If one molecule of the above compound $\left( C _{ X } H _{ Y } O _{ Z }\right)$ contains half as much oxygen as required to burn one molecule of compound $C _{X} H_{Y}$ completely to $CO _{2}$ and $H _{2} O$. The empirical formula of compound $C _{ X } H _{ Y } O _{ Z }$ is
Two compounds I and II are eluted by column chromatography (adsorption of I > II). Which one of following is a correct statement ?
When $9.65\,A$ current was passed for $1.0\, hour$ into nitrobenzene in acidic medium, the amount of p-aminophenol produced is_____.
Which of the following molecules represents the order of hybridisation sp2 , sp2 , sp, sp from left to right atoms ?
If molar conductivity of \(Ca^{2+}\) and \(Cl^-\) ions are 119 and 71 Scm2 mol-1 respectivily, then the molar conductivity of \(CaCl_2\) at infinite dilution is
Hydrogen peroxide reacts with lead sulphide to produce lead sulphate. Identify the other product formed
Nylon 6 is prepared from