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All halides of Cu(ll) are known except t...

All halides of Cu(ll) are known except the iodide because

A

`Cu^(2+)` oxidises `I^-` to `I_2 `

B

Copper (II) iodide undergoes disproportionation

C

`l_2` is a good oxidizing agent

D

lodine atom has least electron affinity

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All Cu(II) halides are known except the iodide. The reason for it is that

The unique behaviour of CU, having a positive E^(@) (reduction potential) accounts for its inability to liberate H_(2) from acids,. Only oxidising acids (nitric acid and hot concentrated sulphuric acid) react with Cu. The high energy of transform Cu(s) to Cu^(2+)(aq.) is not balanced by its hydration enthalpy. On the other hand, All Cu(II) halides are known except iodide. in this case, Cu^(2+) oxidises I^(-) to I_(2) : 2Cu^(2+)+4I^(-) to 2CuI(s)+I_(2) However, copper (I) compounds are unstable in aqueous solution annd undergo disproportionation. 2Cu^(+)(aq.)toCu^(2+)(aq.)+Cu The stability of Cu^(2+)(aq.) rather than Cu^(+)(aq) is due to the much more negative Delta_(Hyd) of Cu^(2+)(aq.) than Cu^(+)(aq.) Q. Select the correct chemical change:

All are taxonomists except

Aryl halides are less reactive than alkyl halides because of

All the following are correct , except :

AAKASH INSTITUTE-TEST 2-EXERCISE
  1. Oxidation state of chlorine in hypochlorous acid

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  2. The shape of the compound of Xe formed on complete hydrolysis of XeF6 ...

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  3. All halides of Cu(ll) are known except the iodide because

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  4. Gas A is formed on the hydrolysis of calcium cyanamide. The gas can tu...

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  5. Thermal decomposition of barium azide produces the same gas as produce...

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  6. Consider the following oxoacids of sulphur I.H2SO3 II. H2S2O7 ...

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  7. The type and number of chelate rings present in complex,[Fe(EDTA)]^- a...

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  8. The spin only magnetic moment of 4.90 B.M. is shown by

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  9. In 3d series, the elements which exhibit highest and lowest melting po...

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  10. The statement which is incorrect regarding phosphinic acid is

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  11. Number of molecules present in 1 dm^3 of N2 at NTP, whose compressibil...

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  12. Compare the average molar kinetic energies of He and Ar at 300 K.

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  13. Which of the following is/are true for Boyle's law?

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  14. Calculate percentage purity of hydrogen peroxide. 0.2 g of which has b...

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  15. For the transition C (diamond) rarr C (graphite), Delta H = - 1.5 kJ...

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  16. Find out incorrect match

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  17. Oxidation states in nitrogen can range from

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  18. xl^- + ylO3^- + zH^+ → l2+ H2O. X, y, z in the given redox reactions...

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  19. Number of electrons involved in the conversion of one nitrate ion to h...

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  20. Which of the following is strongest reducing agent?

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