List of top Chemistry Questions

The enthalpy and entropy change for the reaction:${\mathrm{Br}}_2(l)+{\mathrm{Cl}}_2(\mathrm{g})\to 2\mathrm{BrCl}(\mathrm{g})$ are $30\mathrm{kJ}{\mathrm{mol}}^{-1}$ and $105{\mathrm{JK}}^{-1}{\mathrm{mol}}^{-1}$ respectively.The temperature at which the reaction will be in equilibrium is:

The pH of a 10 ml aqueous solution of HCl is 4. The amount of water to be added to this solution in order to change its pH from 4 to 5 is:

A current of $2$ amp when passed for $5$ hours through a molten salt deposits $22.2\mathrm{g}$ of metal of atomic mass $177$. The oxidation state of the metal in the metal salt is:

Calcium carbonate reacts with aqueous \(HCl\) to give \(CaCl_2 \) and \(CO_2\) according to the reaction, \(CaCO_3 (s) + 2 HCl (aq) → CaCl_2 (aq) + CO_2(g) + H_2O(l)\). What mass of \(CaCO_3\) is required to react completely with \(25 \ mL\) of \(0.75 \ M\) \(HCl\)?

Sulphuric acid reacts with sodium hydroxide as follows.H2SO4 + 2NaOH ⇒ Na2SO4 + 2H2Ohen 1L of 0.1 M sulphuric acid solution is allowed to react with 1 L of 0.1 M sodium hydroxide solution, the amount of sodium sulphate formed and its molarity in the solution obtained is

Which of the following is the most suitable reagent used to distinguish compound (3) from rest of the compounds? 1. ${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{C}-{\mathrm{CH}}_3$2. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3$3. ${\mathrm{CH}}_3-{\mathrm{CH}}_2\mathrm{C}$ : $\mathrm{CH}$4. ${\mathrm{CH}}_3-\mathrm{CH}={\mathrm{CH}}_2$

The number of moles of electrons passed when a current of $2A$ is passed through a solution of electrolyte for $20$ minutes is:

In nitroprusside ion, the iron and NO exist as Fe(II) and $N{O}^{+}$ rather than Fe(III) and NO. These forms can be distinguished by:

What is the name of the above reaction?

When you heat a sample of gas, what happens to the particles that make up the gas?

In ___________, a reaction product is itself a catalyst for that reaction leading to positive feedback.

If benzene in solution containing 30% by mass in carbon tetrachloride, calculate the mole fraction of benzene.

Which of the following carboxylic acid is highly insoluble in water?

Which of the following is Baeyer’sreagent?

Hybridization of $\mathrm{Fe}$ in ${\mathrm{K}}_3[\mathrm{Fe}(\mathrm{CN}{)}_6]$ is:

At ${90}^{\circ }C$, pure water has $\left[H_3{O}^{+}\right]={10}^{-6}m$ on the value of $k_w$ at this temperature is:

Which of the following will be oxidized by \(HIO_4\)?

Azeotropic mixture of water and HCl boils at 381.5 K. By distilling the mixture it is possible to obtain

A catalyst is added to a reaction to increase the rate of reaction. Which of the following statements is correct?

Which of the following compounds give(s) positive test with Tollens' reagent?A. Carboxylic acidB. AlcoholC. Alpha hydroxy ketonesD. Aldehydes

The number of electrons, protons and neutrons in a species are equal to $18$, $16$ and $16$ respectively. Assign the proper symbol to the species.

Plastic used to preserve yogurts is replaced with a polymer called polylactic acid is an example of ____________.

Heavy water is _________. 

$12g$ of urea is present in 1 litre of solution and $68.4g$ of sucrose is separately dissolved in 1 litre of another sample of solution. The lowering of vapour pressure of first solution is:

If we assume that one-sixth the mass of an atom of ${}^{12}C$ isotope is taken as the reference, the mass of one molecule of oxygen will: