List of top Questions asked in UP Board XII

Four alternatives are given in each part of this question. Write the correct alternative in your answer-book. Fe is:
Write the chemical equations for the preparation of 1-iodobutane from the following: 1-butanol
How does the acidified \( KMnO_4 \) solution react with ferrous sulphate, \( SO_2 \), oxalic acid, and sodium thiosulphate?
Calculate the e.m.f. of the following cell writing the cell reaction: \[ \text{Cu} | \text{Cu}^{2+}(1M) || \text{Ag}^+(1M) | \text{Ag} \] Given: \[ E^0_{\text{Cu}^{2+}/\text{Cu}} = +0.34 \text{ volt}, \quad E^0_{\text{Ag}^+/\text{Ag}} = +0.80 \text{ volt} \]
At 298 K conductivity of 0.20 M KCl solution is 0.0248 S cm\(^{-1}\). Calculate its molar conductivity.
Write the units of velocity and velocity constant for zero order reaction.
Write I.U.P.A.C. names of the following compounds: \( CH_3CH(CH_3)CH_2CH_2CH_2CHO \)
The velocity of a gaseous reaction is halved, whereas the volume of the pot is doubled. Calculate the order of reaction.
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.
Explain the importance of complex compounds in qualitative analysis with a suitable example.
Among the following, which is more acidic?
Lucas reagent is
Which of the following amines does not give carbylamine reaction?
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.
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.
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.
Write chemical equations of the method of preparation of diazonium salt and its four chemical reactions.
Define enzyme and write its mechanism.
Write chemical equations for halogenation, nitration, and Friedel-Crafts reaction of chlorobenzene.
Write chemical equation for obtaining primary, secondary, and tertiary alcohols with the help of Grignard's reagent.
Explain mole fraction by an example.