Borax,on being heated strongly above its melt | vedclass

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(D) When $Na_2B_4O_7 \cdot 10H_2O$ (Borax) is heated,it loses water of crystallization and swells. On further heating,it melts to form a clear,transpa

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a mixture of sodium metaborate and boric anhydride

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(D) When $Na_2B_4O_7 \cdot 10H_2O$ (Borax) is heated,it loses water of crystallization and swells. On further heating,it melts to form a clear,transparent glassy bead consisting of $NaBO_2$ (sodium metaborate) and $B_2O_3$ (boric anhydride or boron trioxide).The reaction is as follows:$Na_2B_4O_7 \cdot 10H_2O \xrightarrow{\Delta} Na_2B_4O_7 + 10H_2O$$Na_2B_4O_7 \xrightarrow{\Delta} 2NaBO_2 + B_2O_3$Thus,the transparent glassy mass is a mixture of sodium metaborate and boric anhydride.Option $(D)$ is correct.

Borax,on being heated strongly above its melting point,melts to a liquid and then solidifies to a transparent mass commonly known as a Borax Bead. This transparent glassy mass consists of:

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