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प्रश्न
Write the radical of the following valency:
Calcium
विकल्प
1+
2+
3+
1−
2−
3−
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उत्तर
2+
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संबंधित प्रश्न
Explain the significance of the symbol H.
What do the following symbol stand for?
2H
The formula of the sulphate of an element M is M2(SO4)3
Write the formula of it
Oxide
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
Give the symbol of the following element:
Arsenic
State the type of element for the following:
Carbon
State what is meant by the term ‘activity series of metals’.
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).
Permanganate
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).
Dichromate
How many elements are known at present?
