Chemistry
Which of the following could be used as fuel in propellant or rockets ?

Liquid Hydrogen + Liquid Oxygen
Liquid Oxygen + Liquid Argon
Liquid Hydrogen + Liquid Nitrogen
Liquid Nitrogen + Liquid Oxygen

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Chemistry
All isotopes of the same element have ________

The same atomic number and the atomic mass
The same atomic number but different atomic masses
Different atomic numbers and different atomic mass
Different atomic numbers and the same atomic mass

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Chemistry
Atoms of different elements have

Different atomic number and different number of valence electrons
Same number of electrons and neutrons
Same atomic number and same electronic configuration
Different atomic number and same eletronic configu-ration

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Chemistry
Sullage water is –

Waste water released from kitchen
Waste water released from factories
Waste water released from toilets
Waste water released from hospitals

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