List of top Questions asked in UP Board XII

The velocity of a gaseous reaction is halved, whereas the volume of the pot is doubled. Calculate the order of reaction.
At 298 K conductivity of 0.20 M KCl solution is 0.0248 S cm\(^{-1}\). Calculate its molar conductivity.
Explain the importance of complex compounds in qualitative analysis with a suitable example.
For a first-order reaction, prove that the time taken in completion of 3/4 part of the reaction is two times that of its half-life period.
Lucas reagent is
Which of the following amines does not give carbylamine reaction?
Among the following, which is more acidic?
At 20°C the osmotic pressure of 45 gm per litre solution of a substance is 3.2 atmosphere. Calculate the value of solution constant. The molecular mass of the substance is 342.
Four alternatives are given in each part of this question. Select the correct alternative and write it in your answer-book: Which of the following has lowest osmotic pressure?
Write chemical equation for five reactions of preparation of Amine.
1.26 g of a solid was dissolved in 200 cm\(^3\) aqueous solution. The osmotic pressure of the solution at 300 K was found to be \( 2.57 \times 10^{-3} \) bar. Calculate the molar mass of the solid.
The velocity constants of a reaction are 0.02 s\(^{-1}\) and 0.07 s\(^{-1}\) at 500 K and 700 K, respectively. Calculate the value of \( E_a \).
Explain the Crystal Field Theory (CFT) of coordination compounds.
Explain osmotic pressure and establish an expression for finding the molar mass of solute with the help of this.
Write chemical equations of the method of preparation of diazonium salt and its four chemical reactions.
Write chemical equation for obtaining primary, secondary, and tertiary alcohols with the help of Grignard's reagent.
Write chemical equations for halogenation, nitration, and Friedel-Crafts reaction of chlorobenzene.
Define enzyme and write its mechanism.
Find the value of \( E^\circ_{\text{Ce}^{4+}/\text{Ce}^{3+}} \) for the reaction: \[ 2\text{Ce}^{4+} + \text{Co} \rightarrow 2\text{Ce}^{3+} + \text{Co}^{2+} \] Given: \[ E^\circ_{\text{cell}} = 1.89V, \quad E^\circ_{\text{Co}^{2+}/\text{Co}} = -0.28V \]
Differentiate between order of chemical reaction and molecularity by giving an example.
Write the general electronic configuration of inner transition elements.
Explain mole fraction by an example.
The unit of velocity constant for a first-order reaction is:
The increasing order of reducing ability of metals X, Y, and Z, given their reduction electrode potentials:
\( E^\circ_X = +0.52V, \quad E^\circ_Y = -3.03V, \quad E^\circ_Z = -1.18V \)
Write chemical equations of the reactions of five methods of preparation of aldehyde.