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प्रश्न
Name the element used as a standard for atomic mass scale.
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उत्तर
Carbon is used as a standard in the atomic mass scale.
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संबंधित प्रश्न
Give the symbols and valencies of following radicals:
(a) Hydroxide (b) Chloride
(c) Carbonate (d) ammonium
(e) Nitrate
Define: Compounds
Fill in the blank:
Symbolic expression for a molecule is called _____.
Match the formulas of the following of acids with their correct names:
Acids – (a) HCI (b) HNO3 (c) H2SO4 (d) H2CO3
Names – (1) Carbonic acid (2) Sulphuric acid (3) Hydrochloric acid (4) Nitric acid
State the type of element for the following:
Mercury
State whether the following ion or radical given below of a non-metallic element exhibits valency: 1–, 2– or 3–. (write the ion or radical with the correct valency).
Sulphite
What does the symbol '⇌' present in a chemical equation, mean?
What does the symbol '(s)' present in a chemical equation, mean?
Define Alchemy.
How many elements are known at present?
