UP Board Class 12 Chemistry Question Paper with Answer Key and Solutions PDF (March 4, Code 347 CB)

(a) Structure of the crystal of sodium chloride is:

• (i) body centred cubic (bcc)
  (ii) face centred cubic (fcc)
  (iii) orthorhombic
  (iv) tetragonal

The charge on colloidal particles of Fe\(_2\)O\(_3 \cdot xH_2O\) is:

• (i) Negative
  (ii) Positive
  (iii) No charge
  (iv) None of these

Molecular formula of sulphur at ordinary temperature is:

• (i) S2
  (ii) S4
  (iii) S6
  (iv) S8

Gas present in food packet of substances is:

• (i) H2
  (ii) O2
  (iii) N2
  (iv) F2

Unit of specific conductance is:

• (i) ohm\(^{-1}\) cm\(^2\) mol\(^{-1}\)
• (ii) ohm\(^{-1}\) cm\(^-2\) mol\(^{-1}\)
  (iii) ohm\(^{-1}\) cm\(^2\) mol\(^{2}\)
  (iv) ohm cm\(^2\) mol\(^{-1}\)

Non-electrolyte is:

• (i) Sodium chloride
  (ii) Urea
  (iii) Ammonium nitrate
  (iv) Nitric acid

Write the names of two lyophilic and two lyophobic colloids.

State Hardy–Schulze law.

State anti-osmosis with example.

State the name and formula of electrophile used in the nitration of benzaldehyde.

Name one disaccharide and write its molecular formula.

Differentiate between coordination compound and double salt.

Explain hybridisation on Ni in [Ni(CN)\(_4\)]\(^{2-}\).

Write the formula of half-life period for first order reaction.

Find oxidation number and coordination number of Fe in K\(_4\)[Fe(CN)\(_6\)].

In a first order reaction the concentration of a substance gets dissociated by 99% of the initial concentration in 100 minutes. Calculate the velocity constant of the reaction.

Explain the following: (i) Conductance, (ii) Cell constant.

Silver forms ccp lattice. Edge length of its unit cell is 408.6 pm. Calculate the density of silver. (Atomic weight of Ag = 108)

Calculate the osmotic pressure of 5% aqueous urea solution (w/v) at 27\(^\circ\)C. Molecular weight of urea = 60. (R = 0.0821 L atm K\(^{-1}\) mol\(^{-1}\))

State any four properties of d-block elements.

Phenol shows acidic character but ethanol remains approximately neutral. Why?

Write I.U.P.A.C. name of CH\(_3\)CH\(_2\)OCH\(_2\)CH\(_2\)CH\(_3\).

What are tetrahedral voids?

Which of 0.1 M urea and 0.1 M NaCl will have more osmotic pressure? Explain with reason.

Write balanced chemical equation of the reaction of ethanamine with NaNO\(_2\) + dil. HCl.

Write balanced chemical equation of the reaction of ethanamine with Hinsberg reagent.

Reaction of NaNO\(_3\) and H\(_2\)SO\(_4\).

Reaction of conc. HNO\(_3\) with I\(_2\).

Reaction of nitric acid and zinc.

Explain the method of preparation of ozone gas by electric discharge method.

Write the reaction of ozone with lead sulphide.

Write the reaction between NO (g) and O\(_3\) (g).

Write the structural formula and I.U.P.A.C. name of D-glucose. How will you prove the presence of aldehyde group in glucose molecule?

Denaturation of protein.

Zwitter ion.

Uses of protein.

Write the structural formula of benzaldehyde. Write chemical equations of the reaction of benzaldehyde with (i) NH\(_2\)NH\(_2\), (ii) Tollen’s reagent and (iii) NaOH.

Write I.U.P.A.C. name of Acetaldehyde. Write chemical equations of its reaction with (i) NaHSO\(_3\), (ii) NaOH, (iii) NH\(_2\)NH\(_2\), and (iv) HCN.

Why is chlorine atom of chlorobenzene less reactive than chlorine atom of chloroethane? Write chemical equations of reactions of chlorobenzene with (i) Cl\(_2\) and (ii) conc. H\(_2\)SO\(_4\).

Write short notes on the following:

(i) Electrophilic substitution in halobenzene,

(ii) Wurtz–Fittig reaction,

(iii) Applications of Grignard’s reagent.