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प्रश्न
Two elements X and Y have valencies of 5 and 3, and 3 and 2, respectively. The elements X and Y are most likely to be respectively :
विकल्प
copper and sulphur
sulphur and iron
phosphorus and nitrogen
nitrogen and iron
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उत्तर
nitrogen and iron
Elements X and Y, most likely, are nitrogen and iron.
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संबंधित प्रश्न
State whether the following statement is true or false:
The symbol of element cobalt is CO.
Why is the symbol S for sulphur, but Na for sodium and Si for silicon?
If the symbol for Cobalt, Co, were written as CO, what would be wrong with it?
Give the symbol of the following element:
Aluminium
Write the radical of the following valency:
magnesium
Write the chemical formula of the following:
magnesium oxide
Write the chemical formula of the following:
Sodium bromide
Give the formula of the following acid:
Nitric
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).
Chloride
Describe the different ways in which we can write the symbols of elements. Give appropriate examples.
