Match list I with list II and select this correct answer using the codes given below the lists. List I (Type of glass) List II (Property/use) ( p ) Borosilicate glass 1 . Very high transparency ( q )

Question

Match list I with list II and select this correct answer using the codes given below the lists.

	List I (Type of glass)		List II (Property/use)
$(p)$	Borosilicate glass	$1 .$	Very high transparency
$(q)$	Calcium-alkali silicate glass	$2 .$	Cheap laboratory glass wares
$(r)$	Lead glass	$3 .$	Optical glass
$(s)$	Soda glass	$4 .$	Domestic glass for windows
		$5 .$	Low coefficient of expansion

TestHub · Accepted Answer

A . Borosilicate glasses contains B and sometimes Al. It can withstand heat changes without cracking. Such glasses are widely used for making good quality laboratory equipments. This glass has low coefficient of expansion. B . Calcium-alkali-silicate glass is made by heating alkali metal carbonate, C a C O 3 and S i O 2 . This glass is used as domestic glass for windows and bottles. C . Most of CaO can be replaced by PbO giving lead glass, which has higher reflective index and is used for making optical parts (lenses) and glass ornaments. D . Soda glass is obtained by heating N a 2 C O 3 , C a C O 3 and S i O 2 . It is used for cheap laboratory glass wares.

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