List of top Chemistry Questions asked in UP Board XII

Write short notes on the following:  Denaturation of protein & Nucleic acid

What happens when D-glucose reacts with the following?

 

  1. HI
  2. NH_2OH
  3. Br_2 water
  4. HNO_3
  5. HCN

 

Write the definition and mechanism of esterification of carboxylic acids. Write the chemical equations of the reactions of halogenation and nitration of benzoic acid.
The electrical resistance of a column of 1000 cm length and 0.5 cm radius filled with 0.1 mol L\(^{-1}\) KOH solution is \(5 \times 10^3\) ohm. Calculate the molar conductivity of the solution.
Write two chemical tests to distinguish between aldehyde and ketone and write relevant chemical equations.
Explain the mechanism of nucleophilic substitution reaction in haloalkanes with an example.
Explain the reason of solubility of alcohol and phenol in water.
What are monohydric, dihydric, and trihydric phenols? Write structural formula of each.
Explain effective atomic number (EAN) by an example.
R-NH\(_2\) and HNO\(_2\) react to form:
The name of the reaction of RX and NaI is:
The coordination number of Cu in \([Cu(CN)_4]^{3-}\) ion is:
Which is not a colligative property of solution?
Explain the structure of nucleic acid and its biological action.
Explain the mechanism of nucleophilic addition reaction in aldehydes and ketones by an example. Write chemical equations of the reaction of Aldol and Cross Aldol condensation.
Define Raoult's law. Establish an expression for calculating molar mass of solute on the basis of this law.
Explain lanthanide contraction clearly and give reason why many compounds of transition elements remain coloured.
Explain molar conductivity. The resistance of a cell filled with \( 0.02 \, \text{mol L}^{-1} \) KCl solution is \( 480 \, \Omega \). Calculate the molar conductivity of the solution. (Cell constant = \( 29 \, \text{cm}^{-1} \)).
Differentiate between Molarity and Molality by giving examples.
\( RMgX \) and water react to form:
The co-ordination number of Cr in \( [Cr(C_2O_4)_3]^{3-} \) ion is:
The unit of velocity (rate) constant for a second-order reaction is:
SI unit of \( \rho \) (rho) is:
Write the chemical equation for obtaining phenol from cumene. What is the reaction of phenol with the following? (Write only chemical equations.)

(i) Benzene from benzoic acid:

(ii) Phthalimide from phthalic acid:

(iii) \( m \)-Nitrobenzaldehyde from benzaldehyde:

(iv) Benzaldehyde from benzene:

(v) Silver mirror from \( C_6H_5CHO \):