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Standard XII

Chemistry

Borax

iIts aqueous ...

Question

$(i)$ Its aqueous solution is alkaline to litmus.
$(i i)$ It swells up to glassy material $Y$ on strong heating.
$(i i i)$ When the concentrated solution of sulphuric acid is added to a hot solution of $X$ .white crystal of an acid $Z$ separates out.

The Compound $Y$ is :

sodium borate & boric oxide

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flower of sulphur

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bleaching powder

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none of these

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Solution

The correct option is B sodium borate & boric oxide
When heated borax undergoes various transitions it first loses water molecules and swells. Then resulting in the formation of glassy material.

$N a_{2} B_{4} O_{7} .10 H_{2} O △ - ---- \to N a_{2} B_{4} O_{7} △ - ---- \to 2 N a B O_{2} s o d i u m m e t a b o r a t e + B_{2} O_{3} b o r i c o x i d e$

Sodium metaborate and boric oxide form the glassy material.
Y is sodium metaborate and boric oxide.

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What would you observe in the following cases?
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(i)Its aqueous solution is alkaline to litmus.(ii) It swells up to glassy material Y on strong heating.(iii)When the concentrated solution of sulphuric acid is added to a hot solution of X.white crystal of an acid Z separates out.The Compound Y is :

$(i)$ Its aqueous solution is alkaline to litmus.
$(i i)$ It swells up to glassy material $Y$ on strong heating.
$(i i i)$ When the concentrated solution of sulphuric acid is added to a hot solution of $X$ .white crystal of an acid $Z$ separates out.

The Compound $Y$ is :