List of top Chemistry Questions

The sulphur compound in which the sulphur atom has octet configuration in its valence shell among the following is

The hypothetical complex chloropentaamminecobalt (III) chloride can be represented as

Which of the following compound has all the four types $\left(1^{\circ}, 2^{\circ}, 3^{\circ}\right.$ and $\left.4^{\circ}\right)$ of carbon atoms?

The normality of $26\%$ (wt/vol) solution of ammonia (density $= 0.855$ ) is approximately :

$1.25\, g$ of a sample of $Na _{2} CO _{3}$ and $Na _{2} SO _{4}$ is dissolved in $250\, ml$ solution. $25 ml$ of this solution neutralises $20\, ml$ of $0.1\, N\, H _{2} SO _{4}$. The $\%$ of $Na _{2} CO _{3}$ in this sample is

Formation of polyethylene from calcium carbide takes place as follows $ CaC _{2}+2 H _{2} O \longrightarrow Ca ( OH )_{2}+ C _{2} H _{2}$ $C _{2} H _{2}+ H _{2} \longrightarrow C _{2} H _{4} $ $ nC _{2} H _{4} \longrightarrow\left(- CH _{2}- CH _{2}-\right) n$ The amount of polyethylene obtained from $64.1\, kg$ of $CaC _{2}$ is

Give the possible structure of $X$ in the following reaction : $C_6 H_6 + D_2 SO_4 \xrightarrow{D_2O} X$

The average kinetic energy of an ideal gas per molecule in SI unit at $25^{\circ} C$ will be

The degree of dissociation of $P C l_{5}(\alpha)$ obeying the equilibrium $PCl _{5} \rightleftharpoons PCl _{3}+ Cl _{2}$ is related to the equilibrium pressure by

What will happen when $D-(+)$-glucose is treated with methanolic �$HCl$ followed by Tollens� reagent ?

A compound of Xe and F is found to have 53.5% of Xe. What is oxidation number of Xe in this compound ?

At what temperature, the rate of effusion of $N_2$ would be $1.625$ times than that of $SO_2$ at $50^{\circ} C$ ?

Which of the following method gives better yield of p-nitrophenol?

Nucleotides are joined together by between $ 5' $ and $ 3' $ carbon atoms of pentose sugar

Which of the followings forms the base of talcum powder?

Based on data provided, the value of electron gain enthalpy of fluorine would be :

The wavenumber of the first emission line in the Balmer series of H-Spectrum is: [$R=$ Rydberg constant]

A plot of ln K against $\frac{1}{T}$ (abscissa) is expected to be a straight line with intercept on ordinate axis equal

Among the following the incorrect statement is

One mole of an ideal gas at 300 K is expanded isothermally from an initial volume of 1 litre to 10 litres. Then $ {\Delta S (cal \, deg^{-1} \, mol^{-1})}$ for this process is : $ { (R = 2 \, cal \, K^{-1} \, mol^{-1})}$

Phenol undergoes electrophilic substitution more easily than benzene because

Bromination of cyclohexene under conditions given below yields :

Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution ?

Which one of the following statements about water is FALSE ?

A solid XY kept in an evacuated sealed container undergoes decomposition to form a mixture of gases X and Y at temperature T. The equilibrium pressure is 10 bar in this vessel. $K_p$ for this reaction is :