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CHEMISTRY

Chemistry
Which one of the following statements is not correct? Vulcanisation of rubber makes it

Strong and hard
Withstand higher temperatures
Soft and flexible
Chemical resistant

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Chemistry
The compounds formed when hydrogen combines with p-block elements are called

Molecular hydrides
Metallic hydrides
Ionic hydrides
Polynuclear hydrides

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Chemistry
In vulcanisation process, rubber can be hardened by adding

Alcohol
Sulphur
Nitrogen
Silicon

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Chemistry
The substance that is added to make natural rubber strong and more bouncy is

Sponge
Chlorine
Sulphur
Polythene

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Chemistry
In arc welding, Argon is used because of its

Low reactivity with metal
High flammability
Ability to lower the melting point of the metal
High calorific value

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