List of top Chemistry Questions

What is the pH of a solution with a \( \text{H}^+ \) concentration of \( 1 \times 10^{-3} \, \text{mol/L} \)?
Which of the following acids is a strong acid?
Which of the following gases has the highest density at STP?
What is the number of moles in 18 g of water (\( \text{H}_2\text{O} \))?
What is the pH of a \( 0.01 \, \text{M} \) solution of \( \text{NaOH} \)?
What is the oxidation number of sulfur in \( \text{H}_2\text{SO}_4 \)?
Which of the following compounds has the highest boiling point?
What is the pH of a \( 0.01 \, \text{M} \) solution of \( \text{HCl} \)?
Which of the following gases has the highest density at STP?
What is the molecular mass of \( \text{K}_2\text{SO}_4 \)?
What is the standard electrode potential of a half-reaction in which electrons are transferred from \(Ag^+\) to \(Ag\)?
Which of the following is a characteristic of a coordination compound?
For a first-order reaction, the rate constant is \(k = 0.01 \, \text{s}^{-1}\). What is the half-life of the reaction?
Which of the following is the major product of the reaction between 1-bromobutane and potassium hydroxide in ethanol?
Which of the following elements has the smallest atomic radius?
The role of a catalyst is to change _____________ .
Lower carboxylic acids are highly soluble in water. Explain.
In \( 2A \rightarrow \) Product, the reaction concentration of A remains 0.4 mol\(^{-1}\) from 0.5 mol\(^{-1}\) in 10 minutes.
Calculate the velocity of reaction for this period of time.
Why is [Ni(CN)4]2- square planar while [Ni(CO)4] is tetrahedral? [Atomic number : Ni = 28]
How many oxidation states are exhibited by lanthanides?
How many unpaired electrons are present in Fe$^{+3}$, Zn$^{+2}$ and Mn$^{+2}$ ?
Explain why Cu$^{+2}$ salts are coloured while Zn$^{+2}$ salts are colourless ?
Calculate the molar conductance $\Lambda_m^\circ$ for CaCl$_2$, given that $\lambda^\circ(Ca^{+2}) = 119.5$ S cm$^2$ mol$^{-1}$ and $\lambda^\circ(Cl^-) = 76.3$ S cm$^2$ mol$^{-1}$.

Calculate the two third life of a first reaction having K=5.48 $\times$ 10$^{-14}$s$^{-1}$.

Calculate the half-life time of a first order reaction having K=8min$^{-1}$.