List of top Chemistry Questions asked in UP Board XII

Define carbohydrates and write the differences between glucose and fructose.
Explain Raoult's law for solutions containing non-volatile solute in volatile solvent. Derive mathematical expression for this law.
Discuss the mechanism of unimolecular nucleophilic substitution reaction (\( S_N1 \)) in haloalkanes.
Discuss the method of preparation of potassium permanganate from pyrolusite and write the structural formula of permanganate ion.
Explain the difference between molarity and molality of a solution. How does a change in temperature influence their values?
Deficiency of which vitamin causes night blindness?
Reaction of Benzene diazonium chloride with phenol in basic medium gives
In Etard's reaction, toluene is oxidized to benzaldehyde by
Oxidation number of Mn in \( KMnO_4 \) is
The colligative property of a solution depends upon

What happens when – (write chemical equations only)

(i) Mixture of calcium acetate and calcium formate is dry distilled?

(ii) Acetone is distilled with conc. H2SO4?

(iii) Acetone is heated with chloroform in presence of alkali?

(iv) Formic acid is heated with Fehling’s solution?

(v) Formaldehyde is heated with conc. NaOH solution?

OR

(b) Explain the following:

(i) Benzoin condensation

(ii) Perkin’s reaction

(iii) Cross Cannizzaro reaction

The standard electrode potential of Daniel cell is 1.1 volt. Calculate the standard Gibbs energy for the following reaction: \[ \text{Zn}(s) + \text{Cu}^{2+}(aq) \rightarrow \text{Zn}^{2+}(aq) + \text{Cu}(s) \]
Williamson's synthesis

1.2\% NaCl solution is isotonic to 7.2\% glucose solution. Calculate the van't Hoff factor for NaCl solution.

Write short notes on the following: Reimer-Tiemann's reaction

Write I.U.P.A.C. names of the following:

(i) \([Co(NH_3)_6]Cl_3\)

(ii) \([Ti(H_2O)_6]^{3+}\)

(iii) \( K_2[Ni(CN)_4] \)

(iv) \([Pt(NH_3)_2Cl_2]\)

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.