Chemistry
Which one of the following is a major green house gas?

Carbon dioxide
Freon
Carbon monoxide
Chloro fluorocarbon

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Chemistry
All isotopes of the same element have ________

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

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Chemistry
The open "Sigrees" or coal stoves often require fanning to sustain burning because of

Accumulation of smoke and dust over the sigrees
Tendency of carbon dioxide to form a layer along with dust smoke
Lack of oxygen in the surroundings of sigrees
Interrupted release of moisture from the material

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