List of top Chemistry Questions asked in BITSAT

For the complete combustion of ethanol, \(\text{C}_2\text{H}_5\text{OH}(l) + 3\text{O}_2(g) \rightarrow 2\text{CO}_2(g) + 3\text{H}_2\text{O}(l)\), the amount of heat produced as measured in bomb calorimeter is \(1364.47 \text{ kJ mol}^{-1}\) at \(25^\circ\text{C}\). Assuming ideality the enthalpy of combustion, \(\Delta H_C\), for the reaction will be \((\text{R} = 8.314 \text{ JK}^{-1}\text{mol}^{-1})\)
The value of enthalpy change (\(\Delta H\)) for the reaction \(\text{C}_2\text{H}_5\text{OH}(l) + 3\text{O}_2(g) \rightarrow 2\text{CO}_2(g) + 3\text{H}_2\text{O}(l)\), at \(27^\circ\text{C}\) is \(-1366.5 \text{ kJ mol}^{-1}\). The value of internal energy change for the above reaction at this temperature will be
\(10 \text{ g}\) each of \(\text{CH}_4\) and \(\text{O}_2\) are kept in cylinders of same volume under same temperature, give the pressure ratio of two gases:
Ionisation energy of H-atom is \(13.6 \text{ eV}\). The wavelength of the spectral line emitted when an electron in \(\text{Be}^{3+}\) comes from \(5^{\text{th}}\) energy level to \(2^{\text{nd}}\) energy level is:
The temperature in K at which \(\Delta G = 0\), for a given reaction with \(\Delta H = -20.5 \text{ kJ mol}^{-1}\) and \(\Delta S = -50.0 \text{ J K}^{-1} \text{ mol}^{-1}\) is:
In a cyclic \(pV\) process forming a square loop from \((p = 1 \text{ atm}, V = 2\text{L})\) to \((p = 3 \text{ atm}, V = 4\text{L})\), then, the net heat absorbed by the gas is:
The degeneracy of a hydrogen atom whose energy equals \(-R_H/16\) is:
If \(20 \text{ g}\) of \(\text{CaCO}_3\) is treated with \(100 \text{ mL}\) of \(20\%\) \(\text{HCl}\) solution, the amount of \(\text{CO}_2\) produced is:
The density (in g mL\(^{-1}\)) of a \(3.60 \text{ M}\) sulphuric acid solution that is \(29\%\) \(\text{H}_2\text{SO}_4\) (molar mass \(= 98 \text{ g mol}^{-1}\)) by mass will be:
If the de-Broglie wavelength of a particle of mass (\(m\)) is \(100\) times its velocity, then its value in terms of its mass (\(m\)) and Planck's constant (\(h\)) is:
Half-life of zero order reaction \( A \to \) product is 1 hour, when initial concentration of reactant is 2.0 mol L\(^{-1}\). The time required to decrease concentration of A from 0.50 to 0.25 mol L\(^{-1}\) is:
A first-order reaction is 25% complete in 30 minutes. How much time will it take for the reaction to be 75% complete?
In \( PO_4^{3-} \), the formal charge on each oxygen atom and the P - O bond order respectively are
The Bohr orbit radius for the hydrogen atom (n = 1) is approximately 0.530 \AA. The radius for the first excited state (n = 2) orbit is (in \AA)
For the reaction CO(g) + \(\frac{1}{2}\) O\(_2\)(g) \(\rightarrow\) CO\(_2\)(g) Which one of the statement is correct at constant T and P?
Chloride ion and potassium ion are isoelectronic. Then
The screening effect of d-electrons is
How many moles of oxygen are required to completely combust 1 mole of propane (C\(_3\)H\(_8\))?
Which of the following substances does not undergo hydrolysis in aqueous solution?
What is the IUPAC name of the compound: CH\(_3\) – CH\(_2\) – CH(CH\(_3\)) – CH\(_2\) – CH\(_3\)
Which of the following gases has the highest rate of diffusion?
For a reaction, the initial concentrations and corresponding rates are given. Which method is used to calculate the rate constant?
In s-block chemistry, quicklime and slaked lime are represented as MO and \( \mathrm{M(OH)_2} \) respectively. Identify the metal M.
0.009 g of CaCO\(_3\) is dissolved in 1 litre of solution. Calculate the concentration of the solution in parts per million (ppm).
Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes involving an ideal gas? (Assume non-expansion work is zero)