11.

Answer the following question:

Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22,
Cu = 29)

Identify the compounds A, B and C.

${\mathrm{CH}}_3\mathrm{CN} \stackrel{{\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}}{\to } \mathrm{A} \stackrel{{\mathrm{NH}}_3}{\to } \mathrm{B} \stackrel{\mathrm{Heat}}{\to } \mathrm{C}\stackrel{{\mathrm{Br}}_2/\mathrm{KOH}}{\to } \mathrm{D}$

Calculate the osmotic pressure of a solution prepared by dissolving 0.025 g of K₂SO₄ in 2.0 litres of water at 25^oC assuming that K₂SO₄ is completely dissociated. (mol. wt. of K₂SO₄ = 174 g mol^-1)

What type of isomerism is shown by the following coordination compounds:

[PtCl₂(NH₃)₄]Br₂ and [PtBr₂(NNH₃)₄]Cl₂

Write their IUPAC names.

(i) Write the rate law expression for the reaction A+ B +C → D +E, if the order of reaction is first, second and zero with respect to A, B, and C, respectively. 

(ii) How many times the rate of reaction will increase if the concentration of A, B and C are doubled in the equation given in (i) above?

The rate of reaction becomes four times when the temperature changes from 293 K to 313 K. Calculate the energy of activation (E_a) of the reaction assuming that it does not change with temperature. (R = 8.314 J K^–1 mol^–1)

How do antisemitic differ from disinfectants?

State the role of the following chemicals in the food industry:

(i) Sodium benzoate

(ii) Aspartame

An aromatic organic compound [A] on heating with NH3 and Cu₂O at high pressure gives [B]. The compound [B] on treatment with an ice-cold solution of NaNO₂ and HCI gives [C], which on heating with Cu/HCl gives compound [A] again. Identify the compounds [A], [B] and [C]. Write the name of the reaction for the conversion of [B] to [C].

Write the names of the monomers for the following polymers:

Bakelite