Ncert Exercises & Solutions

Match the species given in Column I with properties given in Column II.

Column I	Column II
A. Diborane	1. Used as a flux for soldering metals
B. Quartz	2. Crystalline form of silica
C. Borax	3. Banana bonds
D. Aluminosilicate	4. Used as a catalyst in petrochemical industries

Codes

	A	B	C	D
1.	3	4	1	2
2.	1	2	3	4
3.	3	2	1	4
4.	4	1	3	2

Hint: Zeolite is a hydrated aluminosilicate mineral and used as a catalyst in petrochemical industries

A. Diborane B₂H₆ is a 3 center-2 electron system. It contains two banana bonds. The structure is as follows:

B. Borax is used as a flux for soldering metals, for heat, scratch, and stain-resistant glazed coating to earthenwares, and as a constituent of medicinal soaps. A

C. If aluminium atoms replace a few silicon atoms in a three-dimensional network of silicon dioxide, an overall structure is known as aluminosilicate. It is used as a catalyst in petrochemical industries.

D. Quarts is a crystalline form of silica. Quartz is extensively used as a piezoelectric material; it has made possible to develop extremely accurate clocks, modern radio and television broadcasting and mobile radio communications.
Borax is also used mixed with water as a flux when soldering jewelry metals such as gold or silver, where it allows the molten solder to wet the metal and flow evenly into the joint.

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