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All India Engineering / Architecture Entrance Examination (AIEEE)

AIEEE 2008 Chemistry

Q. 22. In context with the industrial preparation of hydrogen from water gas (CO + H₂), which of the following is the correct statement?

1. H₂ is removed through occlusion with Pd.
2. CO is oxidised to CO₂ with steam in the presence of a catalyst followed by absorption of CO₂in alkali.
3. CO and H₂are fractionally separated using differences in their densities.
4. CO is removed by absorption in aqueous Cu₂Cl₂solution.

Sol:

Q. 23. In which of the following octahedral complexes of Co (atomic number 27), will the magnitude of be the highest?

1. 
2. 
3. 
4. 

Sol: Magnitude of will be heighest with the strongest ligand. In the given context CN^- is the strongest ligand and would lead to a greater seperatin between t_2g and c_g orbitals.

Q. 24. The coordination number and the oxidation state of the element 'E' in the complex (where (en) is ethylene diamine) are, respectively,

1. 4 and 3
2. 6 and 3
3. 6 and 2
4. 4 and 2

Sol: Ethyldiamine and oxalateion are both bidentate legends. Co-ordination number of E in the complex.

Q. 25. Identify the wrong statement in the following:

1. Ozone layer does not permit infrared radiation from the sun to reach the earth.
2. Acid rain is mostly because of oxides of nitrogen and sulphur.
3. Chlorofluorocarbons are responsible for ozone layer depletion.
4. Greenhouse effect is responsible for global warming.

Sol: Ozone layer does not permit the ultraviolet radiation from the sum to the earth.