Adding sodium carbonate, Distillation, Adding caustic soda, Boiling in this which method that cannot be used for removing permanent hardness of water?
Why Radiocarbon is produced in the atmosphere?
It is easier to roll a stone up a sloping road than to lift it vertical upwards, what is the reason behind this?
The absorption of ink by blotting paper involves which phenomenon?
In the four half lives of active isotopes, which is most dangerous to handle?
Which gas is used for artificial ripening of green fruit?
Which is the main chemical constituent of the oil of cardamom which is responsible for flavour of this oil?