HSC Science (Computer Science) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Chemistry

Calculate the standard enthalpy of formation of \[\ce{CH3OH_{(l)}}\] from the following data:

\[\ce{CH3OH_{(l)} + 3/2 O2_{(g)} -> CO2_{(g)} + 2H2O_{(l)} }\]; Δ_rH° = − 726 kJ mol^-1 

\[\ce{C_{(graphite)} + O2_{(g)} -> CO2_{(g)}}\]; Δ_cH° = −393 kJ mol⁻¹

\[\ce{H2_{(g)} + 1/2 O_{(g)} -> H2O_{(l)}}\]; Δ_fH° = −286 kJ mol⁻¹

Calculate the work done and comment on whether work is done on or by the system for the decomposition of 2 moles of NH₄NO₃ at 100 °C
NH₄NO_3(s) → N₂O_(g) + 2H₂O_(g)

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Using the relationship ΔG° of cell reaction and the standard potential associated with it, how will you show that the electrical potential is an intensive property?

Derive the relationship between standard cell potential and equilibrium constant of cell reaction.

Equilibrium constant of the reaction, \[\ce{2Cu^{\oplus}_{(aq)} -> Cu^{2\oplus}_{(aq)} + Cu_{(s)}}\] is 1.2 × 10⁶. What is the standard potential of the cell in which the reaction takes place?

Ozone layer is depleted by ______.

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Name two gases which deplete ozone layer.

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Give one example showing reducing property of ozone.

How is dioxygen prepared in the laboratory from KClO₃?

What happens when lead sulfide reacts with ozone \[\ce{O3}\]?

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What happens when nitric oxide reacts with ozone.

Discuss the structure of sulfur dioxide.

Draw structures of XeF₆.

Draw the structure of XeO₃

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Draw structures of XeOF₄

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Draw structures of XeF₂.

What are interhalogen compounds?

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How are xenon fluorides XeF₂, XeF₄ and XeF₆ obtained? Give suitable reactions.

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How are XeO₃ and XeOF₄ prepared?

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Describe the structure of the Ozone. Give two uses of ozone.