List of top Chemistry Questions

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 \( 3.0 \times 10^{-4} \, \text{mol/L} \)?
Which of the following is the correct electron configuration for the element with atomic number 19?
Which of the following compounds has the highest boiling point?
What is the limiting reagent in the reaction: \( 2H_2 + O_2 \rightarrow 2H_2O \), if 3 moles of \( H_2 \) and 2 moles of \( O_2 \) are reacted together?
Which of the following is a strong electrolyte?
Which of the following gases is most likely to exhibit ideal gas behavior?
Which of the following compounds is an example of an ester?
What is the pH of a solution with a hydrogen ion concentration of \( [H^+] = 1 \times 10^{-4} \, \text{M} \)?
What is the oxidation state of chromium in the compound \( \text{Cr}_2\text{O}_3 \)?
The reaction between hydrogen and oxygen to form water is given as: \( 2H_2 + O_2 \rightarrow 2H_2O \). If 4 moles of hydrogen react with excess oxygen, how many moles of water will be formed?
Mixing of $N_2$ and $H_2$ form an ideal gas mixture at room temperature in a container. For this process, which of the following statement is true?