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Chemistry

Chemistry
Which among the following elements is found in maximum percentage in the human body ?

Nitrozen
Hydrogen
Carbon
Oxyzen

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Chemistry
Natural rubber is the polymer of :

Ethylene
Isoprene
Styrene
Butadiene

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Chemistry
When iron rusts, its weight

Increases
Remains the same
First increases and then decreases
Decreases

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Chemistry
The temperature of oxy-acetylene flame is around

2800°C
3200°C
3600°C
4000°C

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Chemistry
The number of moles of solute present in 1 kg of a solvent is called its

molality
normality
molarity
formality

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Chemistry
Which of the following is not a chemical reaction'?

Burning of coal
Conversion of water into steam
Digestion of food
Burning of paper

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