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Chemistry

Chemistry
Which one of the following is a micro-element ?

Nitrogen
Hydrogen
Chlorine
Oxygen

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Chemistry
Entropy of Universe is always

Zero
Decreasing
Increasing
Constant

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Chemistry
The material known in commerce as Terylene is a

Natural fibre
Synthetic fibre
Blend of cotton and silk
Modified natural fibre

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Chemistry
The fiber least prone to catch fire is

Nylon
Terylene
Polyester
Cotton

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Chemistry
In arc welding, Argon is used because of its

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

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Chemistry
Which metal is the heaviest in periodic table among the following ?

Pt
W
Os
Pb

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