The method that cannot be used for removing permanent hardness of water is
adding sodium carbonate
distillation
adding caustic soda
boiling
Additional Questions
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The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle? |
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The gas used for artificial ripening of green fruit is |
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Zone refining is used for the purification of |
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The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is |
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The molecule which has the highest percentage of ionic character among the following is |
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The high reactivity of fluorine is due to |
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The iron ore magnetite consists of |
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The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is |
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The major constituent of air is |
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The main chemical constituent of clay is |
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