Chemistry Basic Unit 5 Test

2CO_(g)+O_2(g) →2CO_2(g)+ X kJ.

In this equation X kJ is

• Heat of formation of CO2

• Heat of combustion

• Heat of reaction

• Heat of sublimation

The heats of neutralization of four acids A, B, C and D are –57.26, –39.32, –46.86, and –51.88 kJ/mol respectively, when they are neutralized by a common base, the acidic character follows the order

• A > B > C > D

• A > D > C > B

• D > C > B > A

• D > B > C > A

Reaction of water with quick lime result in the rise in the temperature of the system. Using the concentration change, indicate the nature of the reaction?

• Third order reaction

• Endothermic reaction

• Non spontaneous reaction

• Exothermic reaction

Correct decreasing order of energy is

• 1 erg > 1 Joule > 1 Cal

• 1 Cal > 1 Joule > 1 erg

• 1 erg > 1 Cal > 1 Joule

• 1 Joule > 1 Cal > 1 erg

Lesser the energy of a system

• Greater is its stability

• Lesser is its stability

• Greater is its un-stability

• None of these

For the melting of ice ΔH is

• Greater is its stability

• Positive

• Zero

• Cannot be predicted

ΔH for the reaction, H_(g) + H_(g) → H_2(g) will be

• Zero

• Positive

• Negative

• ≥ 0

The ΔH for the reaction, CH COOH → CH COO^-+H⁺

• Negative

• Positive

• Zero

• Unpredictable

According to latest sign conventions the correct expression representing the first law of thermodynamics is

• ΔE=q + w

• ΔE=q x w

• ΔE + PV

• All the expressions are correct

For a gaseous reaction N₂O₄ → 2NO₂

• ΔH = ΔE

• ΔE= 0

• ΔH > ΔE

• ΔH < ΔE