What is an endothermic reaction?
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Pentane has _____ structural isomers.
What is the ratio of masses of hydrogen and oxygen in the water?
___________ gases absorb long wave (infrared) radiation from the earth and emit it again towards the earth.
The volume of 10 g of gas X is 5.6 litre at NTP. What is the molecular weight of X?
Aromatic hydrocarbons contain at least _____ benzene like ring in their molecules.
Sulphur and Chlorine can have what type of a bond?
Beryl is an ore/mineral of