Stoichiometry - Study Mode

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[#186] One 'Therm' is equivalent to

(A) 10 5 BTU

(B) 10 5 kcal

(C) 10 9 BTU

(D) 10 9 kcal

Correct Answer

(A) 10 5 BTU

[#187] Refluxing of part of the distillate in a fractionating column is a 'recycling operation', aimed primarily at

(A) Heat conservation

(B) Yield enhancement

(C) Product enrichment

(D) None of these

Correct Answer

(C) Product enrichment

[#188] Isotopes are atoms having the same

(A) Mass number

(B) Number of neutrons

(C) Atomic mass

(D) None of these

Correct Answer

(D) None of these

[#189] One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH 4 + 2O 2 → CO 2 + 2H 2 O. Both the reactants and products are in gas phase. ΔH° 298 = -730 kJ/mole of methane. If the average specific heat of all the gases/vapour is 40 J/mole.K, the maximum temperature rise of the exhaust gases in °C would be approximately equal to

(A) 1225

(B) 1335

(C) 1525

(D) 1735

Correct Answer

(D) 1735

[#190] The pressure of 'V' litres of a dry gas is increased from 1 to 2 kgf/cm 2 at a constant temperature. The new volume will become

(A) $$frac{{ ext{V}}}{2}$$

(B) 2V

(C) $$frac{{ ext{V}}}{4}$$

(D) V 2

Correct Answer

(A) $$frac{{ ext{V}}}{2}$$