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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 :
पर्याय
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
Give the names and symbols of five familiar substances which you think are elements.
Give the symbol and the number of atoms of the following elements present in carbon dioxide.
State which element exists in the highest percentage in earth’s crust.
State which element exists in the highest percentage in atmosphere.
Elements are mainly classified into metals and non-metals. State six properties of metals which differ from non-metals.
State the type of element for the following:
Platinum
Write the chemical formula of the following:
calcium sulphide
Write the chemical formula of the following:
calcium carbonate
Name the following:
An acid whose formula is ‘H2CO3’.
Name three metals whose symbols are derived from the first letter of the name of the element.
