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प्रश्न
A student wants to have 3.011 × 1023 atoms each of magnesium and carbon elements. For this purpose, he will have to weigh :
विकल्प
24 g of magnesium and 6 g of carbon
12 g of carbon and 24 g of magnesium
20 g of magnesium and 10 g of carbon
12 g of magnesium and 6 g of carbon
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उत्तर
12g of magnesium and 6g of carbon
The student will have to weigh 12 g of Magnesium and 6 g of Carbon.
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संबंधित प्रश्न
What do you understand by :
Noble gases
Select elements and compounds from the following list: Iron, plaster of paris, chalk, common salt, copper, aluminium, calcium oxide, cane sugar, carbon, silica, sodium sulphate, uranium, potassium carbonate, silver, carbon dioxide.
On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used
Magnetic separation
The symbols of the elements cobalt, aluminium, helium and sodium respectively written by a student are as
follows. Which symbol is the correct one ?
Give the symbol of the following element:
Zinc
Give the symbol of the following element:
Copper
Give the symbol of the following element:
Chlorine [chloride]
Give the formula of the following gas:
Ammonia
State the valency of the following metallic element and write symbol with the valency
Aluminium
Certain metal exhibit variable valencies which include valencies: 1+, 2+, 3+, and 4+.
State the variable valency of the following metal.
Iron
write symbol with the variable valency
