What is the percentage of methane in biogas?
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NaCl has ______.
___________ gases absorb long wave (infrared) radiation from the earth and emit it again towards the earth.
Glass is also called ________.
Which of the following elements has the lowest melting point?
Terylene is a condensation polymer of ethylene glycol and which acid?
The salt concentration (measured as salinity in parts per thousand), is _______ % in sea.
Oxide of which of the following will turn red litmus blue?
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