11.

For one mole of an ideal gas, increasing the temperature from 10°C to 20°C

• increases the average kinetic energy by two times

• increases the rms velocity by √2 times

• increases the rms velocityby two times

• increases both the average kinetic energy and rms velocity, but not significantly

Carbon can reduce ferric oxide to iron at a temperature above 983 K because

• carbon monoxide formed is thermodynamically less stable than ferric oxide

• carbon has a higher affinity towards oxidation than iron

• free energy change for the formation of carbon dioxide is less negative than that for ferric oxide

• iron has a higher affinity towards oxygen than carbon

50 cm³ of 0.2 NHCl is titrated against 0.1 N NaOH solution. The titration is discontinued after adding 50 cm³ of NaOH.The remaining titration is completed by adding 0.5 N KOH. The volume of KOH required for completing the titration is

• 12 cm³

• 10 cm³

• 25 cm³

• 10.5 cm³

In which one of the following, does the given amount of chlorine exert the least pressure in a vessel of capacity 1 dm³ at 273 K?

• 0.0355g

• 0.071g

• 6.023 × 10²¹ molecules

• 0.02 mol

Based on the first law of thermodynamics, which one of the following is correct?

• For an isochoric process = ΔE = - q

• For an adiabatic process = ΔE =-w

• For an isothermal process = q = + w

• For a cyclic process q = - w

1 g of silver gets distributed between 10 cm³ of molten zinc and 100 cm³ of molten lead at 800°C. The percentage of silver in the zinc layer is approximately

• 89

• 91

• 97

• 94

0.023 g of sodium metal is reacted with 100cm³ of water. The pH of the result solution is

• 10

• 11

• 9

• 12

A buffer solution contains 0.1 mole of sodium acetate in 1000 cm³ of 0.1 M acetic acid. To the above buffer solution, 0.1 mole of sodium acetate is further added and dissolved. The pH of the resulting buffer is equal to

• pK_a - log2

• pK_a

• pK_a +2

• pK_a + log 2

The empirical formula of a non-electrolyte is CH₂O. A solution containing 6g of the compound exerts the same osmotic pressure as that of 0.05 M glucose solution at the same temperature. The molecular formula of

• C₂H₄O₂

• C₃H₆O₃

• C₅H₁₀O₅

• C₄H₈O₄

1 dm³ solution containing 10^-5 moles each of Cl^- ions and CrO${}_4^{2-}$ ions is treated with 10^-4 moles of silver nitrate. Which one of the following observations is made?

[K_spAg₂CrO₄ = 4 × 10^-12] and [K_spAgCl = 1 × 10^-10] 

• Precipitation does not occur

• Silver chromate gets precipitated first

• Silver chloride gets precipitated first

• Both silver chromate and silver chloride start precipitating simultaneously