List of top Chemistry Questions

What is the IUPAC name of CH\(_3\)CH\(_2\)OH?
Calculate the rate constant of a reaction with a given half-life.
What is the oxidation state of chromium in K₂Cr₂O₇?
What is the major product of the reaction of an alkene with bromine water?
What is the molecular geometry of the water molecule (H₂O)?
Identify the geometry and hybridization of the central atom in SF₄.
The rate of a reaction doubles when the temperature is increased by 10°C. What is the approximate value of the activation energy?
What is the major product when 1-bromopropane undergoes nucleophilic substitution with \(OH^-\)?
For a reaction A → B, the concentration of A decreases from 0.8 M to 0.2 M in 10 minutes. If the rate constant is 0.1 min⁻¹, what is the order of the reaction?
A 2 L container holds oxygen gas at 300 K and 2 atm pressure. If the temperature is increased to 600 K and the volume is doubled, what is the final pressure?
How many grams of $ \text{CO}_2 $ are produced when 10 g of $ \text{C}_2\text{H}_6 $ (ethane) is completely combusted? Reaction: $ 2\text{C}_2\text{H}_6 + 7\text{O}_2 \rightarrow 4\text{CO}_2 + 6\text{H}_2\text{O} $
How much water must be added to 500 mL of 2 M $ \mathrm{H_2SO_4} $ solution to make it 0.5 M?
For the reaction $ N_2 + 3H_2 \rightleftharpoons 2NH_3 $, if initially 1 mole of $ N_2 $ and 3 moles of $ H_2 $ are taken and at equilibrium 0.4 moles of $ NH_3 $ are formed, find the equilibrium concentration of $ H_2 $.
What volume of CO$_2$ gas at STP is produced by the reaction of 10 g of CaCO$_3$ with excess HCl?
Calculate the empirical formula of a compound containing 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass.
The number of moles of CO$_2$ produced when 2 moles of C$_2$H$_6$ are completely burnt is:
How many grams of $ \mathrm{Al_2(SO_4)_3} $ are required to produce 10 L of a 0.5 M solution? (Molar mass = 342 g/mol)
The acidic character of the oxides increases in the order:
The pH of a 0.01 M solution of a weak acid HA is 4. Calculate its dissociation constant (Ka).
A first-order reaction is 25% complete in 30 minutes. What is its half-life?
The complex $[Cr(NH_3)_4Cl_2]^+$ shows how many geometrical isomers?
The standard electrode potential for $\text{Zn}^{2+}/\text{Zn}$ is $-0.76$ V and for $\text{Cu}^{2+}/\text{Cu}$ is $+0.34$ V. The EMF of the cell
$$ \text{Zn}|\text{Zn}^{2+}||\text{Cu}^{2+}|\text{Cu} $$ is:
Which of the following compounds undergoes electrophilic substitution most readily?
A buffer solution is prepared by mixing 0.1 mol of acetic acid (\( \mathrm{p}K_a = 4.74 \)) and 0.2 mol of sodium acetate in 1 L solution. What is the pH of the buffer?
Which of the following coordination compounds shows linkage isomerism?