CBSE Class 11-science Answered

plzzzz solve

Asked by satya785583 | 16 Mar, 2019, 09:18: PM

Expert Answer

(a)

   (i)  $straight N subscript 2 space plus space 3 straight H subscript 2 space rightwards harpoon over leftwards harpoon from 450 space minus space 500 to the power of degree straight C comma space above space 200 space atm to Fe space and space Mo of space space 2 NH subscript 3 space plus space heat$

   (ii)  $2 NO subscript 2 left parenthesis straight g right parenthesis end subscript space space space space left right arrow space space space space straight N subscript 2 straight O subscript 4 left parenthesis straight g right parenthesis end subscript space space space space space space space ΔH space space equals space minus 58.0 space kJ divided by mol space space straight N subscript 2 straight O subscript 4 left parenthesis straight g right parenthesis end subscript Brown space space space space space space space space space space space space space Colorless$

(b) Nitrogen, sulphur, halogens and phosphorus present in an organic compound are detected by Lassaignes test.

The elements present in the compound are converted from covalent form to ionic form by fusing the compound with sodium metal.

$FeSO subscript 4 space plus space NaOH space rightwards arrow with blank on top space stack space Fe left parenthesis OH right parenthesis subscript 2 with Green space ppt. below thin space plus thin space Na subscript 2 SO subscript 4 Fe left parenthesis OH right parenthesis subscript 2 space plus 2 space stack NaCN space with Sodium space extract below stack rightwards arrow space Fe left parenthesis CN right parenthesis subscript 2 space plus space 2 space NaOH with blank on top Fe left parenthesis CN right parenthesis subscript 2 space plus space 4 NaCN space rightwards arrow with blank on top space stack Na subscript 4 left square bracket Fe left parenthesis CN right parenthesis subscript 6 right square bracket with Sodium space space ferrocynide below stack 3 Na subscript 4 left square bracket Fe left parenthesis CN right parenthesis subscript 6 right square bracket with Sodium space space ferrocynide below space plus space 4 space FeCl subscript 3 space space rightwards arrow with blank on top space space stack Fe subscript 4 left square bracket Fe left parenthesis CN right parenthesis subscript 6 right square bracket subscript 3 with ferric space space space ferrocynide below space space plus space 12 space NaCl$

(c) An aqueous solution of CuSO₄ cannot be stored in a container made by zinc because zinc is more active than copper therefore, zinc will displace copper from its salt solution.Also, the reduction potential of copper is less as compared to zinc. hence an aqueous solution of CuSO4 will reduce itself into copper and zinc sulphate will be formed.The reaction occurs as follows: