Gaseous benzene reacts with hyodrogen gas in presence of a nickel catalyst to form gaseous cyclohexane according to the reaction, 

C₆H₆ (g) + 3H₂ (g) → C₆H₁₂ (g)

A mixture of C₆H₆ and excess H₂ has a pressure of 60 mm of Hg in an unknown volume. After the gas had been passed over a nickel catalyst and all the benzene converted to cyclohexane, the pressure of the gas was 30 mm of Hg in the same volume at the same temperature. The fraction of C₆H₆ (by volume) present in the original volume is

• 1/3

• 1/4

• 1/5

• 1/6

Given, $∆$G°=-nFE°_cell and $∆$G° = -RT ln k. The value of n = 2 will be given by the slope of which line in the figure

• OA

• OB

• OC

• OD

Consider the following changes

M(s) → M(g)                ... (1)
M(g) → M²⁺(g) + 2e^-    ...(2)
Mg) → M⁺(g) + e^-         ...(3)
M(g) → M²⁺(g) + e^-      ...(4)
M(g) → M²⁺ (g) + 2e^-   ...(5)
The second ionisation energy of M could be determined from the energy values associated with 

• 1 + 2 + 4

• 2 + 3 - 4

• 1 + 5 - 3

• 5 - 3

The ratio of slopes of K_max vs V and V₀ vs v curves in the photoelectric effects gives (v = frequency, K_max = maximum kinetic energy, v₀ = stopping potential)

• the ratio of Planck's constant of electronic charge

• work function

• Planck's constant

• charge of electron

The dissolution of Al(OH)₃ by a solution of NaOH results in the formation of

• [Al(H₂O)₄(OH)₂]⁺

• [Al(H₂O)₃(OH)₃]

• [Al(H₂O)₂(OH)₄]^-

• [Al(H₂O)₆(OH)₃

If the ionisation energy and electron affinity of an element are 275 and 86 kcal mol^-1 respectively, then the electronegativity of the element on the Mulliken scale is

• 2.8

• 0.0

• 4.0

• 2.6

Consider the water gas equilibrium reaction,

C (s) + H₂O (g) $\rightleftharpoons$ CO (g) + H₂ (g)

Which of the following statements is true at equilibrium?

• If the amount of C(s) is increased, less water would be formed

• If the amount of C(s) is increased, more CO and H₂ would be formed

• If the pressure on the system is increased by halving the volume, more water would be formed

• If the pressure on the system is increased by halving the volume, more CO and H₂ would be formed

For the given reaction,

H₂ (g) + Cl₂ (g) → 2H⁺ (aq) + 2Cl^- (aq); $∆\mathrm{G}°$ = -262.4 kJ

The value of free energy of formation ($∆\mathrm{G}{°}_{\mathrm{f}}$) for the ion Cl^-1 (aq), therefore will be

• -131.2 kJ mol^-1

• +131.2 kJ mol^-1

• -262.4 kJ mol^-1

• +262.4 kJ mol^-1

The molarity of NO₃^- in the solution after 2L of 3M AgNO₃ is mixed with 3L of 1M BaCl₂ is

• 1.2 M

• 1.8 M

• 0.5 M

• 0.4 M

10.

A certain metal when irradiated by light (r = 3.2 × 10¹⁶ Hz) emits photoelectrons with twice kinetic energy as did photoelectrons when the same metal is irradiated by light (r = 2.0 × 10¹⁶ Hz). The v₀ of metal is

• 1.2 × 10¹⁴ Hz

• 8 × 10¹⁵ Hz

• 1.2 × 10¹⁶ Hz

• 4 × 10¹² Hz