When 10 g of methane is completely burnt in oxygen, the heat evol

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 Multiple Choice QuestionsMultiple Choice Questions

121.

In an isothermal process

  • q = 0 and E = 0

  • q ≠ 0 and E = 0

  • q = 0 and E ≠ 0

  • q ≠ 0 and E ≠ 0


122.

Minimum work is obtained when 1 kg of...gas expanded under 500 kPa to 200 kPa pressure at 0°C

  • chlorine

  • oxygen

  • nitrogen

  • methane


123.

Which one of the following represents the graph between log p (on Y-axis) and 1/T  on X-axis)? (p = vapour pressure of a liquid, T = absolute temperature).


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124.

When 10 g of methane is completely burnt in oxygen, the heat evolved is 560 kJ. What is the heat of combustion (in kJ mol-1) of methane?

  • -1120

  • -968

  • -896

  • -560


C.

-896

CH4 + 2O2  CO2 + 2H2O10g H = -560kJ(12 + 4 = 16) g = 1 moleThe heat of combustton of 10 g CH4= -560 kJSo, the heat of combustton of 16g CH4      =-56010×16=-896 kJ/ mol


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125.

Calculate the heat of combustion (in kJ) of methane from the following data :

(i) C(graphite) + 2H2 (g) → CH(g) ; H = -74.8 kJ

(ii) C(graphite) + O2 (g) → CO2 (g) ; H = -393.5 kJ

(iii) H2 (g) + 1/2 O2 (g) → H2O (l) ; H = -286.2 kJ

  • -891.1

  • -816.3

  • -965.9

  • -1040.7


126.

Which of the following is an endothermic reaction?

  • N2 (g) + 3H2 (g) - 92 kJ → 2NH3 (g)

  • N2 (g) + O2 (g) + 180.8 kJ → 2NO (g)

  • H2 (g) + Cl2 (g) → 2HCl (g) + 184.6 kJ

  • C (graphite) + 2H2 (g) → CH2 (g) + 74.8 kJ


127.

Which of the following is not correct?

  • 3O2 dischargesilent electric 2O3H = -284.5 kJ

  • Ozone undergoes addition reaction with unsaturated carbon compounds

  • Sodium thuosulphate reacts with I2 to form sodium tetrathionate and sodium iodide.

  • Ozone oxidises lead sulphide to lead sulphate.


128.

Which of the following is not correct?

  • Dissolution of NH4Cl in excess of water is an endothermic process.

  • Neutralisation process is always exothermic

  • The absolute value of enthalpy (H) can be determined experimentally.

  • The heat of reaction at constant volume is denoted by ΔE.


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129.

Identify the reaction for which H  E :

  • S(rhombic) + O2 (g) → SO2 (g)

  • N2 (g) + O2 (g) → 2NO (g)

  • H2 (g) + Cl2 (g) → 2HCl (g)

  • CO (g) + 12O2 (g) → CO2 (g)


130.

Calculate H in kJ for the following reaction:

C (g) + O2 (g) → CO2 (g)

Given that, 

H2O (g) + C (g) → CO (g) + H2 (g) ; H = +131 kJ

CO (g) + 12O2 (g) → CO2 (g); H = -282 kJ

H2 (g) + 12O2 (g) → H2O (g); H = -242 kJ

  • -393

  • +393

  • +655

  • -655


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