Question

metal is used in dry cells.
Galvanisation prevents_
The ores usually have some impurities called_
mixed.
Non-metals form_
oxides by reacting with oxygen.
Vulcanisation involves the treatment of rubber with_
Magnesium burns with a dazzling_ light on heating.
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Answer 1

Answer:

The nonmetal used to treat rubber in the process of vulcanization is sulphur. Natural rubber is soft, sticky and has less tensile strength. Vulcanization makes rubber more strong, tough and elastic. Natural rubber is mixed with 3 to 5 % sulphur and heated at 100 to 150 deg C, which results in cross linking of chains of cis-1,4-polyisoprene through disulphide (−S−S−) bonds.

Answer 2

Explanation:

गिव टू एग्जांपल टू शो दैट ए फोर्स इज रिक्वायर्ड टू मेक ए फास्ट मूविंग ऑब्जेक्ट टो गेट स्लो