Short Answer TypeCalculate the enthalpy change for the reaction: C(graphite) + 2H2(g) CH4(g)
Given that:
(i) C(graphite) + O2 (g) → CO2 (g) Δ H f °= - 393.5 KJ mol-1
(ii) H2(g) + 0.5 O2 (g) → H2O(l) ΔH = -285.8 KJ mol-1
(iii) CH4 (g) + 2O2(g) → CO2 (g) + 2H2O(l) ΔH°f = - 890.3 KJ mol-1
(i) A solution of O. 1(N)KCl offers a resistance of 245 ohms. Calculate the specific conductance and the equivalent conductance of the solution if the cell constant is 0.571 cm-1
(ii) Compare the crystals of copper and diamond giving one similarity and one difference.
(iii) If the standard free energy change for a reaction is found to be zero, what is the value of the equilibrium constant for the reaction?
Give balanced equations for each of the following reactions:
(i) Chlorine and hot concentrated caustic soda.
(ii) Sulphur dioxide and acidified potassium permanganate.
(i)Name the type of isomerism shown by the following pair of compounds: [PtCl2/NH3)4IBr2 and [PtBr2(NH3)4]Cl2
Give a chemical test to distinguish between the given pair of isomers.
(ii) Draw the geometrical isomers exhibited by the compound [PtCl2(NH3)2].
(i) [PtCl2(NH3)4] Br2 and [PtBr2 (NH3)4]Cl2 have Ionization isomerism because when coordination compound having same molecular formula show difference in their ionization behavior and furnish different types of ions in solution the phenomenon is called ionization isomerism.
When [Pt C12(NH3)4] Br2 treated with AgN03 it gives yellow precipitate while [PtBr2(NH3)4] Cl2 gives white precipitate.
ii) Geometrical isomers [Pt(NH3)2Cl2]
Write the formulae of the following co-ordination compounds:
(i) tetracarbonyl nickel (0)
(ii) potassium dicyanoargentate (1)
Account for the following:
(i) SF6 exists but OF6 does not, though both oxygen and sulphur belong to the same group in the Periodic table.
(ii) Zn+2 compounds are white in colour but Cu+2 compounds are coloured, though both zinc and copper are d-block elements.
(i)To which class of compounds does IF7 belong? What is the structure of the molecule?
(ii) Give the balanced equation for the preparation of silver nitrate in the laboratory.
How can the following conversions be brought about:
(i) Ethylamine to methylamine
(ii) Benzene to acetanilide
(iii) 2 Propanol to acetoxime
Give one example for each of the following name reactions:
(i) Hell Volhard Zelinsky (HVZ) reaction,
(ii) Clemmensen’s reduction.
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