List of top Chemistry Questions

By using which process, sodium carbonate is generally prepared?
In drinking water, if the maximum prescribed concentration of copper is x mg dm⁻³, the maximum prescribed concentration of zinc will be
Which one of the following mixtures can be separated by steam distillation technique?
The incorrect statement about Castner-Kellner cell process is
At 298K, if the standard Gibbs energy change \(\Delta_r G^\circ\) of a reaction is - 115 kJ, the value of \(\log_{10} K_p\) will be (\(R = 8.314 \text{ J K}^{-1}\text{mol}^{-1}\))
At T(K) root mean square (rms) velocity of argon (molar mass 40 g mol⁻¹) is 20 ms⁻¹. The average kinetic energy of the same gas at T(K) (in J mol⁻¹) is
200 mL of an aqueous solution of HCl (pH = 2) is mixed with 300 mL of aqueous solution of NaOH (pH = 12) and is diluted to 1.0 L. The pH of the resulting solution is
Identify the electron rich hydrides from the following
The energy associated with electron in first orbit of hydrogen atom is \(-2.18 \times 10^{-18}\) J. The frequency of the light required (in Hz) to excite the electron to fifth orbit is (\(h=6.6 \times 10^{-34}\) Js)
Observe the following data (\(\Delta_i H_1\), \(\Delta_i H_2\) and \(\Delta_{eg}H\) represent the first, second ionisation enthalpies and electron gain enthalpy respectively).
Using the data identify the most reactive metal.
Match the following
The correct answer is
In Sr (Z=38), the number of electrons with \(l=0\) is x, number of electrons with \(l=2\) is y. \((x-y)\) is equal to (\(l\) = Azimuthal quantum number)
Schottky defect is NOT observed in _______.
Benzene when treated with Br\(_2\) in the presence of FeBr\(_3\), gives 1,4-dibromobenzene and 1,2-dibromobenzene. Which type of reaction is this?
Among the following, which will have inversion of configuration on reaction with aqueous alkali and why?
(i) 1-chloropropane
(ii) 2-chloro-2-methylpropane
Sweetest sugar is:
State whether entropy change is positive or negative in the following examples : (i) Melting of ice (ii) Vaporisation of a liquid Explain ‘common ion effect’ with example.
Define a unit cell. Which colour is shown by NaCl crystal due to formation of F-centre? Why does fluorine show anomalous behaviour in ‘17 group’ elements?
Draw a neat and labelled diagram of a lead accumulator cell. Write the overall reactions taking place at cathode and anode during discharging of the cell.
Write the formula to calculate EAN. Explain formation of [CO(NH\(_3\))\(_6\)]\(^{3+}\) complex ion with respect to : (i) Type of hybridisation (ii) Magnetic property
Write the reducing agents used to convert Fe\(_2\)O\(_3\) to ‘Fe’ in the reduction zone of blast furnace. Write chemical equations involved in : (i) Carbylamine reaction for ethylamine. (ii) Hoffmann Bromamide degradation for acetamide.
Calculate spin only magnetic moment of M\(^{2+}\) ion. [atomic number of M = 26] Write condensed electronic configuration of Gadolinium [Z = 64].
\( \Delta \)H for formation of ethane gas is \( -84.4 \) kJ at 300 K. Calculate \( \Delta \)U for the reaction.
Explain Cannizzaro’s reaction with the help of benzaldehyde. Write the reaction for the conversion of cyclohexene to adipic acid.
Define zero order reaction. A reaction takes place in two steps : (i) NO(g) + Cl\(_2\)(g) \( \rightarrow \) NOCl\(_2\)(g) (ii) NOCl\(_2\)(g) + NO(g) \( \rightarrow \) 2NOCl(g). Write the overall reaction and identify the reaction intermediate.