31.

At temperature of 298K, the emf of the following electrochemical cell,

Ag (s) | Ag⁺ (0.1 M)|| Zn²⁺ (0.1 M) | Zn (s) will be (Given, E°_cell = -1.562 V)

• -1.532 V

• -1.503 V

• 1.532 V

• -3.06 V

Roasted copper pyrite on smelting with sand produces

• FeSiO₃ as fusible slag and Cu₂S as matte

• CaSiO₃ as infusible slag and Cu₂O as matte

• Ca₃(PO₄)₂ as fusible slag and Cu₂S as matte

• Ca₃(PO₄)₂ as infusible slag and Cu₂S as matte

Ionisation potential values of noble gases decrease down the group with increase in atomic size. Xenon forms binary fluorides by the direct reaction of elements. Identify the correct statement(s) from below.

• Only the heavier noble gases form such compounds

• It happens because the noble gases have higher ionisation energies

• It happens because the compounds are formed with electronegative ligands

• Octet of electrons provide the stable arrangements

The increase in rate constant of a chemical reaction with increasing temperature is (are) due to the fact(s) that

• the number of collisions among the reactant molecules increases with increasing temperature

• the activation energy of the reaction decreases with increasing temperature

• the concentration of the reactant molecules increases with increasing temperature

• the number of reactant molecules acquiring the activation energy increases with increasing temperature

The product of the given reacion is

In a mixture, two enantiomers are found to be present in 85% and 15% respectively. The enantiomeric excess (ee) is

• 85%

• 15%

• 70%

• 60%

The product of the given reaction is-

Best reagent for nuclear iodination of aromatic compounds is

• KI/ CH₃COCH₃

• I₂/CH₃CN

• KI/ CH₃COOH

• I₂ / HNO₃

In the reaction,

R MgBr + HC(OEt)₃ $\stackrel{\mathrm{Ether}, {\mathrm{H}}_3{\mathrm{O}}^{+}}{\to }$ P, the product P is

• RCHO

• R₂CHOEt

• R₃CH

• RCH(OEt)₂

Identify the correct method for the synthesis of the compound shown below from the following alternatives.