List of top Chemistry Questions

A sample of drinking water was found to be severely contaminated with chloroform \((CHCl_3)\) supposed to be a carcinogen. The level of contamination was 15ppm (by mass):
(i) express this in percent by mass
(ii) determine the molality of chloroform in the water sample.
In the electrolysis of molten NaCl, the product obtained at the cathode is:
Rosenmund reduction is used to convert acyl chlorides into:
What is the pH of a \( 0.001 \, \text{M} \) solution of \( \text{NaOH} \)?
What is the IUPAC name of the compound \( \text{CH}_3\text{CH}_2\text{COOH} \)?
Which of the following is the strongest oxidizing agent?
Which of the following compounds is formed by covalent bonding?
What is the molar mass of \( \text{Na}_2\text{CO}_3 \)?
Explain the difference between a strong acid and a weak acid. How does the pH of a solution change when a strong acid is added compared to a weak acid?
You are given 100 mL of a 0.1 M solution of HCl and 200 mL of a 0.2 M solution of NaOH. Calculate the pH of the resulting solution after mixing the two solutions.
You are given a set of experimental data for a chemical reaction, including the concentrations of reactants and products at different times. Determine the order of the reaction and the rate constant.
The density of kerosene is $800 \,kg \,m^{-3}$. Its relative density is
The van’t Hoff factor for a solution of \( \text{K}_2\text{SO}_4 \) in water is:
Which of the following is an example of physisorption?
For a first-order reaction, the time required to reduce the concentration of the reactant to half its initial value is:
Which of the following statements is \emph{correct regarding the coordination compound \([Fe(CN)_6]^{4-}\) and fructose structure?}
The EAN of cobalt in the complex \([Co(NH_3)_6]^{3+\) is:}
$44g$ of a sample on complete combustion gives $88$ $gm$ $CO_2$ and $36$ $gm$ of $H_2O$. The molecular formula of the compound may be:
What is the volume of 1.0 mol of an ideal gas at standard temperature and pressure (STP)? (STP is 0°C and 1.0 atm, and the ideal gas constant R = 0.0821 L·atm/mol·K)
What is the molar mass of a gas if 2.5 g of the gas occupies 1.0 L at 300 K and a pressure of 1.0 atm? (Use the ideal gas law, R = 0.0821 L·atm/mol·K)
What is the pH of a \( 0.01 \, \text{M} \) solution of hydrochloric acid (\( \text{HCl} \))?
What is the concentration of \( \text{NaOH} \) in a solution if \( 25.0 \, \text{mL} \) of \( 0.100 \, \text{M} \) \( \text{HCl} \) is neutralized by \( 50.0 \, \text{mL} \) of \( \text{NaOH} \)?
What is the molarity of a solution prepared by dissolving \( 5.0 \, \text{g} \) of sodium chloride (\( \text{NaCl} \)) in \( 250 \, \text{mL} \) of water? (Molar mass of NaCl = \( 58.5 \, \text{g/mol} \))
What is the molarity of a solution made by dissolving \( 2.5 \, \text{g} \) of potassium chloride (\( \text{KCl} \)) in \( 500 \, \text{mL} \) of water? (Molar mass of \( \text{KCl} = 74.5 \, \text{g/mol} \))
What is the pH of a solution with a hydrogen ion concentration of \( 3.0 \times 10^{-4} \, \text{mol/L} \)?