List of top Questions asked in UP Board XII

Identify and in the following reactions: 

An aqueous solution containing 12.48 gm of barium chloride in 1.0 kg of water, boils at 373.0832 K. Calculate the degree of dissociation of barium chloride. (\( K_b = 0.52 \) kg mol\(^{-1}\), molar mass of BaCl\(_2\) = 208.34)
An aromatic compound on treatment with aqueous ammonia and heating forms compound , which on heating with \( Br_2 \) and KOH forms a compound of molecular formula \( C_6H_7N \). Write the structures and names of the compounds , , and .
The coordination number of Co in \([Co(NH_3)_4Cl_2]Cl\) is
Define molal elevation constant. Calculate the boiling point of an aqueous solution containing 0.6 g of urea (molar mass = 60) in 100 g of water. The value of molal elevation constant for water is 0.52 K kg mol\(^{-1}\) and boiling point of water is 373.15 K.

Write two characteristic properties of transition metals.

Deficiency of Vitamin A causes
Appropriate reagent used to distinguish between acetaldehyde and acetone is
Write short notes on the changes in atomic and ionic sizes and ionization enthalpy of transition metals.

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.