Given that for the reaction. N2(g) + 3H2(g) ⇌ 2NH3(g) ∆H = -92kJ. What is the enthalpy of formation of ammonia from its elements?
A. -46KJ mol -1 B. -184KJmol -1 C. -92KJmol -1 D. 184KJmol -1 E. +46KJmol -1 Correct Answer: Option A – -46KJ mol -1 Explanation In the reaction, the enthalpy of formation 2 mole of NH3 is – 92kJ. Therefore the standard ΔH of formation = −92kJ/2...
If sulphur is dissolved in carbon (IV) sulphide and the solution is allowed to evaporate, the allotrope of sulphur formed is?
A. plastic sulphur B. amorphous sulphur C. rhombic sulphur D. monoclinic sulphur E. colloidal sulphur Correct Answer: Option C – rhombic sulphur
Which of the following is used extensively in manufacturing photographic chemicals?
A. Aluminium chloride B. Zinc chloride C. Silver chloride D. Mercury (ll) chloride E. lron (ll) chloride Correct Answer: Option C – Silver chloride
Octane number is highest in petrol containing a high proportion of?
A. heptane B. octane C. 2-methylpentane D. 2, 4-dimethylpentane E. 2,2,4-trimethylpentane Correct Answer: Option E – 2,2,4-trimethylpentaneProducts
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