Ans11 30

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󰁎󰁃󰁅󰁒󰁔󰀯󰁃󰁂󰁓󰁅 󰁃󰁈󰁅󰁍󰁉󰁓󰁔󰁒󰁙 󰁃󰁌󰁁󰁓󰁓 󰀱󰀱 󰁴󰁥󰁸󰁴󰁢󰁯󰁯󰁫 󰁨󰁴󰁴󰁰󰀺󰀯󰀯󰁷󰁷󰁷󰀮󰁔󰁵󰁴󰁯󰁲󰁂󰁲󰁥󰁥󰁺󰁥󰀮󰁣󰁯󰁭   󰁨󰁴󰁴󰁰󰀺󰀯󰀯󰁷󰁷󰁷󰀮󰁔󰁵󰁴󰁯󰁲󰁂󰁲󰁥󰁥󰁺󰁥󰀮󰁣󰁯󰁭 󰁅󰁮󰁧󰁬󰁩󰁳󰁨󰀬 󰁆󰁲󰁥󰁮󰁣󰁨󰀬 󰁁󰁣󰁣󰁯󰁵󰁮󰁴󰁳󰀬 󰁍󰁂󰁁

󰁃󰁯󰁮󰁴󰁡󰁣󰁴 󰁦󰁯󰁲 󰁏󰁮󰁬󰁩󰁮󰁥 󰁔󰁵󰁴󰁯󰁲󰁩󰁮󰁧 󰁩󰁮 󰁐󰁨󰁹󰁳󰁩󰁣󰁳󰀬 󰁍󰁡󰁴󰁨󰀬 󰁃󰁨󰁥󰁭󰁩󰁳󰁴󰁲󰁹󰀬

Solutions/Answers to NCERT/CBSE CHEMISTRY Class 11(Class XI)textbook CHAPTER

ELEVEN

󰁔󰁨󰁥 󰁰󰀭󰁂󰁬󰁯󰁣󰁫 󰁅󰁬󰁥󰁭󰁥󰁮󰁴󰁳 11.30 A certain salt X gives the following results. (i) Its aqueous solution is alkaline to litmus. (ii) It swells up to a glassy material Y on strong heating. (iii) When conc. H2SO4 is added to a hot solution of X, white crystal of an acid Z separates out.

Write equations for all the above reactions and identify X, Y and Z.

Since the aqueous solution is alkaline to litmus, the compound must be a salt of strong base and weak acid.

Since it swells up to a glassy material Y on strong heating X should be borax and Y should be sodium meta borate or boric anhydride or a mixture of both.

When conc. H2SO4 is added to a hot solution of X, white crystal of an acid Z separates out which means Z is orthoboric acid.

The equations are as given below.

(i)

Na2B4O7.10H2O→2NaOH + H2B4O7 +8H2O9 When dissolved in water form basic solution)

(ii)

Na2B4O7.10H2O (Heat)→ Na2B4O7 + 10H2O

󰀨󰁩󰁩󰁩󰀩 

Na2B4O7.10H2O + H2SO4 → 4H3BO3 + Na2SO4 +5H2O 

󰂩󰁔󰁵󰁴󰁯󰁲󰁂󰁲󰁥󰁥󰁺󰁥󰀮󰁣󰁯󰁭 󰁐󰁬󰁥󰁡󰁳󰁥 󰁤󰁯 󰁮󰁯󰁴 󰁣󰁯󰁰󰁹 󰁴󰁨󰁥 󰁡󰁮󰁳󰁷󰁥󰁲 󰁧󰁩󰁶󰁥󰁮 󰁨󰁥󰁲󰁥  󰁨󰁥󰁲󰁥  󰁗󰁲󰁩󰁴󰁥 󰁴󰁯 󰁵󰁳 󰁦󰁯󰁲 󰁨󰁥󰁬󰁰 󰁩󰁮 󰁵󰁮󰁤󰁥󰁲󰁳󰁴󰁡󰁮󰁤󰁩󰁮󰁧 󰁴󰁨󰁥 󰁳󰁯󰁬󰁵󰁴󰁩󰁯󰁮  󰁳󰁯󰁬󰁵󰁴󰁩󰁯󰁮 

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