List of top Chemistry Questions

3-tert-butylphenol reacts with different halogens by electrophillic substitution under appropriate conditions that are given below:

The observed pattern of electrophillic substitution can be explained by

Which law directly explains the law of conservation of mass ?

Electrovalent bond formation depends on

The melting point of particles in nano form ___________

Taking chromium and arsenic, which are toxic, out of pressure-treated wood, and using new less toxic chemicals for bleaching paper, are examples of___________.

Solid $Ba{\left({NO}_3\right)}_2$ is gradually dissolved in a $1.0\times {10}^{-4}M{Na}_2{CO}_3$ solution. At which concentration of ${Ba}^{2+}$, precipitate of ${BaCO}_3$ begins to form?$(K_{sp}$ for ${BaCO}_3=5.1\times {10}^{-9})$

When $10ml$ of $0.2M$ solution of an acid is added to $250ml$ of a buffer solution with $pH=6.34$, the $pH$ of the solution becomes $6.32$. The buffer capacity of the solution is:

The tendency of a reaction to take place spontaneously is greatest when the reaction is:

Given the solubility curves of ${\mathrm{KNO}}_3$ and $\mathrm{KCl}$, which of the following statements is not true?

In the presence of a catalyst, the heat evolved or absorbed during the reaction _______.

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:

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:

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 \(0.75 \ M\) \(HCl\)?

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. ${\mathrm{CH}}_3-\mathrm{CH}={\mathrm{CH}}_2$

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 carboxylic acid is highly insoluble in water?

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 is Baeyer’sreagent?

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