List of top Chemistry Questions

For which one of the following systems at equilibrium, at constant temperature will the doubling of die volume cause a shift to the right?

Given that the equilibrium constant for the reaction $ {2SO2(g) + O2(g) <=> 2SO3(g)}$ has a value of278 at a particular temperature. What is the value of the equilibrium constant for the following reaction at the same temperature? $ {SO3(g) <=> SO2(g) + \frac{1}{2} O2(g)}$

Which of the following compounds is formed when a mixture of $K_2Cr_2O_7$ and NaCl is heated with cone. $H_2SO_4$ ?

Compound 'A' of molecular formula $C_4H_{10}O$ on treatment with Lucas reagent at room temperature gives compound ?B\ When compound ?B? is heated with alcoholic $KOH$, it gives isobutene. Compound ?A? and ?B? are respectively

Ionisation energy of $He^+$ is $19.6 \times 10^{-18}\, J$ atom$^{-1}$. The energy of the first stationary state $(n= 1)$ of $Li^{2+}$ is

The molecular formula of diphenyl methane, How many structural isomers are possible when one of the hydrogens is replaced by a chlorine atom?

For the reaction $2N_2O_5 \to 4NO_2 + O_2$, rate and rate constant are $1.02 \times 10^{-4}$ mol $lir^{-1}$ $sec^{-1}$ and $3.4 \times 10^{-5}$ $sec^{-1}$ respectively then concentration of $N_2O_5$ at that time will be

An element occuring in the bcc structure has $12.08 \times 10^{23}$ unit cells. The total number of atoms of the element in these cells will be

In Williamson synthesis if tertiary alkyl halide is used than

The correct order of the thermal stability of hydrogen halides (H-X) is

The reagent (s) which can be used to distinguish acetophenone from benzophenone is (are)

In case of nitrogen, $NCl_3$ is possible but not $NCl_5$ while in case of phosphorus, $PCl_3$ as well as $PCl_5$ are possible. It is due to

In the extraction of Cu, the metal is formed in the bessemer converter due to the reaction:

In a compound, atoms of element Y form ccp lattice and those of element X occupy $2/3^{rd}$ of tetrahedral voids. The formula of the compound will be

At 320 K, a gas A2 is 20% dissociated to A(g). The standard free energy change at 320 K and 1 atm in J mol$^{-1}$ is approximately : (R=8.314 JK$^{-1}$ mol$^{-1}$; ln 2=0.693; ln 3=1.098)

Given that, for the reaction,
\(\frac 12H_2+\frac 12Cl_2→HCl\)
△H_f (HCI) = -93 kJ/mol, B.E(H₂) = 434 kJ/mol, B.E(Cl₂) = 242 kJ/mol
The bond dissociation energy of HCl is

If M is element of actinoids series, the degree of complex formation decreases in the order.