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प्रश्न
An element A forms an oxide A2O5.
What is the valency of element A ?
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उत्तर
Element A forms an oxide A2O5. Crossing the valencies, we can see that the valency of O (oxide) is −2 and that of element A is 5.
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संबंधित प्रश्न
Write down the name of a compound represented by the following formula:
K2SO4
Give the name of the element present in the following compound:
Quick lime
Define: Atomic number
Write the formulae of the following compounds. Also name the elements present in them.
- Water
- Ammonia
- Methane
- Sulphur dioxide
- Ethanol
One of the forms of a naturally occurring solid compound P is usually used for making the floors of houses. On adding a few drops of dilute hydrochloric acid to P, brisk effervescence are produced. When 50 g of reactant P was heated strongly, than 22 g of a gas Q and 28 g of a solid R were produced as products. Gas Q is the same which produced brisk effervescence on adding dilute HCl to P. Gas Q is said to cause global warming whereas solid R is used for white-washing.
- What is (i) solid P (ii) gas Q, and (iii) solid R.
- What is the total mass of Q and R obtained from 50 g of P ?
- How does the total mass of Q and R formed compare with the mass of P taken ?
- What conclusion do you get from the comparison of masses of products and reactant ?
- Which law of chemical combination is illustrated by the example given in this problem ?
Molecular compounds are usually formed by the combination between :
An element X forms the following compounds with hydrogen, carbon and oxygen :
H2X, CX2, XO2, XO3
State the three valencies of element X which are illustrated by these compounds.
Give one example of a triatomic molecule
State the atomicity of the following:
Neon
Which of the following is a triatomic molecule?
