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In the series Sc (Z = 21) to Zn (Z = 30)...

In the series Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomisation of zinc is the lowest, i.e., `126" kJ "mol^(–1)`. Why?

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In the formation of metallic bonds, no electrons from 3d-orbitals are involved in case of zinc, while in all other metals of the 3d series, electrons from the d-orbitals are always invilved in the formation of metallic bonds.
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Assertion : In the series Sc to Zn, the enthalpy of atomisation of zinc is the lowest. Reason : Zinc has greater number of unpaired electrons.

Why is enthalpy of atomisation is the lowest for Zn in 3d series of transition elements ?

In the 3d series (Sc = 21 to Zn = 30) : (i) Which elements shows maximum number of oxidation states ? (ii) Which elements shows only +3 oxidation state ? (iii) Which elements has the lowest enthalpy of atomization?

(a) Why do transition elements show variable oxidation states? (i) Name the element showing maximum number of oxidation states among the first series of transition metals from Sc (Z = 21) to Zn (Z = 30). (ii) Name the element which shows only + 3 oxidation state. (b) What is lanthanoid contraction? Name an important alloy which contains some of the lanthanoid metals.

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Bond dissociation enthalpies of H_(2)(g) and N_(2)(g) are 436.0 kJ mol^(-1) and 941.8 kJ mol^(-1) , respectively, and ethalpy of formation of NH_(3)(g) is -46kJ mol^(-1) . What is the enthalpy fi atomisation of NH_(3)(g) ?. What is the avergae bond ethalpy of N-H bond?

The emf of the cell reaction Zn(s) +Cu^(2+) (aq) rarr Zn^(2+) (aQ) +Cu(s) is 1.1V . Calculate the free enegry change for the reaction. If the enthalpy of the reaction is -216.7 kJ mol^(-1) , calculate the entropy change for the reaction.

Zinc reacts with dilute hydrochloric acid to give hydrogen at 17^(@)C . The enthalpy of the reaction is -12.00 kJ mol^(-1) of zinc and entropy change equals 50 J K^(-1) mol^(-1) for the reaction. Calculate the free enegry change and predict whether the reaction is spontaneous or not.

Which of the following are correct about Zn,Cd,Hg I) They exhibit enthalpy of atomisation as the d-subshell is full II) Zn,Cd do not show variable oxidation states, Hg can show +1,+2 states III) Compounds of Zn,Cd,Hg are paramagnetic IV) They are soft metals

CENGAGE CHEMISTRY ENGLISH-APPENDIX INORGANIC VOLUME 2-Short Answer Type
  1. In the series Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomisation ...

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  2. Which metals are generally extracted by the electrolytic processes ? W...

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  3. What type of ores are roasted?

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  4. Give the names of the four most abundant elements in the earth's crust...

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  5. What is a mineral? How does it differ from an ore?

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  6. Why do some metals occur in the native state?

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  7. Name the method used for refining of : (a). Zirconium. (b). Nickel...

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  8. Can iron be purified by amalgamation?

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  9. Both iron and aluminium combine slowly with oxygen at room temperature...

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  10. What is the name given to solid phase of earth?

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  11. Give one example where hydrometallurgy is used for metal extraction?

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  12. Name the method of metal refining which is generally used when a metal...

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  13. When is electrolytic reduction applied for getting a metal?

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  14. What name is given to carbon reduction process for extracting the meta...

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  15. An ore has impurities which are attracted by magnet suggest process fo...

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  16. In moist air, copper corrodes to produce a green layer on the surface....

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  17. The value ofDelta (f) G^(Ө) for formation of Cr(2) O(3) is – 540 kJmo...

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  18. What do you understand by roasting in presence of NaCl?

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  19. Why NF3 cannot be hydrolysed, while NCl3 can be readily hydrolysed?

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  20. Why NI5 does not exist While PCl5 exists?

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  21. Why the boiling point of ammonia is greater than phosphine?

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