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प्रश्न
The valencies (or charges) of some of the ions are given below :
Ion Valency Ion Valency (Charge) (Charge)
Sodium ion 1+ Nitrate ion 1–
Copper ion 2+ Sulphide ion 2–
Using this information, write down the formulae of :
- Sodium sulphide
- Copper nitrate
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उत्तर
Formula of the listed compounds can be derived by crossing the individual valencies over the ions/elements. Therefore, the formula for sodium sulphide and copper nitrate are:
- Na2S
- Cu(NO3)2
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संबंधित प्रश्न
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 :
The particle which is formed by the gain of electrons by an atom is called ..............
Fill in the following blank with suitable word:
The particle which is formed by the loss or gain of electrons by an atom is called..............
Fill in the following blank with suitable word:
A potassium ion has positive charge because it contains less............... than.....................
An element X has a valency of 2. Write the simplest formula for oxide of the element.
A particle X has 17 protons, 18 neutrons and 18 electrons. This particle is most likely to be :
A particle P has 18 electrons, 20 neutrons and 19 protons. This particle must be :
Write symbols of the following elements and the radicals obtained from them and indicate the charge on the radicals.
Mercury, potassium, nitrogen, copper, sulphur, carbon, chlorine, oxygen
Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compound.
Sodium zincate
Name the following radicals and give their valencies:
1. SO4
2. CO3
3. OH4.
4.Cr2O7
