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प्रश्न
Define ‘formula mass’ of a compound.
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उत्तर
Formula mass of a compound is the relative mass of its 'formula unit' compared to the mass of a carbon-12 atom (which has a mass of exactly 12 units).
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संबंधित प्रश्न
Calculate the number of aluminium ions present in 0.051 g of aluminium oxide.
(Hint: The mass of an ion is the same as that of an atom of the same element. Atomic mass of Al = 27 u)
State whether the following statements are true or false:
A sodium ion has positive charge because it has more protons than a neutral atom.
Fill in the following blank with suitable word:
A sulphide ion has negative charge because it contains less ....................... than ...................
Give example.
Basic radicals
What do you understand by the following terms?
Acid radical
Complete the following table.
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Acid Radicals `→` |
Chloride |
Nitrate |
Sulphate |
Carbonate |
Hydroxide |
Phosphate |
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Basic Radicals `↓` |
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Magnesium |
MgCl2 |
Mg(NO3)2 |
MgSO4 |
MgCO3 |
Mg(OH)2 |
Mg3(PO4)2 |
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Sodium |
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Zinc |
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Silver |
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Ammonium |
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Calcium |
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Iron (II) |
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Potassium |
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Name the following radicals and give their valencies:
1. SO4
2. CO3
3. OH4.
4.Cr2O7
Differentiate between the following with suitable examples- A basic radical and an acid radical
State if the following element or radical is divalent?
Sulphite
State if the following element or radical is divalent?
Chromium
