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Chemistry

Chemistry
What is the mass percentage of oxygen in carbon dioxide (CO2)

0.305
0.727
0.509
0.658

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Chemistry
The pH of human blood is between :

44052
7.5-8
4.5-5
6.5-7

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Chemistry
Bauxite is used as raw material by which industry ?

Gold
Iron
Aluminium
Steel

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Chemistry
Hard steel contains

0.5 to 1.5 per cent carbon
0.1 to 0.4 per cent carbon
2 to 5 per cent carbon
0.01 to 0.04 per cent carbon

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Chemistry
Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has

High bond dissociation energy
Smaller atomic radius
High nuclear charge
Stable half filled 2p sub level

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Chemistry
By-product obtained by soap industry is

Caustic soda
Glycerol
Naphthalene
Caustic potash

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MORE MCQ ON Chemistry

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