Chemistry-
General
Easy

Question

Hydrogen can be obtained from water by

  1. Reaction with metal oxides    
  2. Reaction with non-metal oxides    
  3. Reaction with metals    
  4. Reaction with metal hydrides    

The correct answer is: Reaction with metal hydrides


    Mg plus 2 straight H subscript 2 straight O not stretchy rightwards arrow Mg left parenthesis OH right parenthesis subscript 2 plus straight H subscript 2 not stretchy upwards arrow
    LiH plus straight H subscript 2 straight O not stretchy rightwards arrow LiOH plus straight H subscript 2 not stretchy upwards arrow

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    Correct statements from the graph

    I) Above 1073K, capital delta G to the power of 0 end exponent for the formation of Fe2O3 is less negative than capital delta G to the power of 0 end exponent for the formation of CO from carbon
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    IV) In blast furnace, reduction of Fe2O3 occurs in different temperature ranges with below 1073K by CO (or) above 1073K by carbon

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    I) Above 983K, Carbon can reduce any metal oxide at high temperature and itself oxidised to CO
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    II) In the first reaction (Formation of CO2 from ‘C’) capital delta S to the power of 0 end exponent=0 & capital delta G to the power of 0 end exponentremains nearly same, i.e it is independent of temperature
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