Which of the following gases is used to prevent food material from getting oxidised?
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Two or more elements combine to form a
Which of the following is NOT the combined from of carbon?
In a water molecule, the ratio of mass of Hydrogen to the mass of Oxygen is always:
Name the Russian chemist who stated that the properties of elements are a periodic function of their atomic masses?
Non-metal oxides are usually
Which of the following metals is found in free state?
Common salt (NaCl) is made up of
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