List of top Chemistry Questions

What is the time required for 75 % completion of a first order reaction if rate constant is \(23.03 \text{minute}^{-1}\) ?
Which of the following reactions exhibits the reducing property of ozone ?
For a reaction \(\text{A}⟶\) product, \(k = 2\times 10^{-2} \text{s}^{-1}\). If the initial concentration of A is \(1.0 \text{mol dm}^{-3}\) find the value of \(log\frac{1}{[A]_t}\) after 100 second ?
If standard reduction potential of four electrodes A, B, C, D are \(+2.5\,\text{V},+3.0\,\text{V},-2.0\,\text{V}\) and \(-1.5\,\text{V}\) respectively. When is the standard emf of cell maximum?
A galvanic cell consist copper electrode and standard hydrogen electrode. If \(E^{\circ}(\text{Cu}_{(aq)}^{+2}|\text{Cu}_{(s)}) = +0.34\,\text{V}\), then identify a reaction taking place at positive electrode during working of cell.
Calculate the mole fraction of solute in solution if vapour pressure of a solution and pure solvent are 27 mm Hg and 30 mm Hg respectively at 298 K.
Calculate the molar mass of nonelectrolyte solute when 6 gram of it is dissolved in 1 \(\text{dm}^3\) water has osmotic pressure \(2.4 \text{atm}\) at 300 K \((R = 0.0821 \text{atm dm}^3 \text{K}^{-1} \text{mol}^{-1})\)
If standard reduction potential of Zn, Ni and Fe are \(-0.76\,\text{V}\), \(-0.23\,\text{V}\) and \(-0.44\,\text{V}\) respectively. For the reaction (Stated below) to be spontaneous find out electrodes X and Y considering above electrode potentials
\(\text{X}_{(s)}+\text{Y}_{(aq)}^{+2}⟶\text{X}_{(aq)}^{+2}+\text{Y}_{(s)}\)
Which of the following is an example of fractional order reaction ?
A metal forms fcc structure. Calculate the volume of fcc unit cell in \(\text{cm}^3\) if void volume is \(1.66\times 10^{-23} \text{cm}^3\).
Which of the following is NOT terminal alkyne ?
What is the total number of adjacent unit cells shared by each face particle of fcc unit cell ?
Calculate the number of unit cell in \(0.5\) g metal if the product of volume and density of unit cell is \(6.65\times 10^{-23}\) g
The major product of the following reaction is
Which from following compounds does NOT contain double bond in it ?
What is the oxidation number of carbon in oxalic acid ?
Which of the following aqueous salt solutions has the least pH value ?
An organic monobasic acid has dissociation constant \(1.96\times 10^{-8}\). What is its percentage dissociation in \(0.01\) M solution ?
Which from following compounds is NOT optically active?
What is the general formula of halide salts of alkali metals if M is a metal atom ?
Calculate the standard enthalpy change for the following reaction,
\(2\text{C}_2\text{H}_6\text{(g)}+7\text{O}_2\text{(g)}⟶4\text{CO}_2\text{(g)}+6\text{H}_2\text{O}\text{(l)}\)
Given, \(\Delta _fH^{\circ}(\text{C}_2\text{H}_6) = -85 \text{kJ mol}^{-1}\)
\(\Delta _fH^{\circ}(\text{CO}_2) = -390 \text{kJ mol}^{-1}\)
\(\Delta _fH^{\circ}(\text{H}_2\text{O}) = -285 \text{kJ mol}^{-1}\)
The solubility of salt \(\text{AX}_2\) is \(6\times 10^{-12} \text{mol dm}^{-3}\). What is solubility product of the salt ?
Which of the following is the correct expression of the first law of thermodynamics for adiabatic processes ?
A container contains mixture of He and Ne gases at certain temperature. He is 20 % by mass of mixture. What is the ratio of partial pressure of Helium to Neon ?
1 mole of an ideal gas is compressed isothermally and reversibly from initial pressure \(x\) kPa to final pressure \(2x\) kPa at 300 K. Find the work done \((R = 8.314 \text{J K}^{-1}\text{mol}^{-1})\)