Advertisements
Advertisements
प्रश्न
Two elements sometimes can form more than one compound.
विकल्प
True
False
Advertisements
उत्तर
True
APPEARS IN
संबंधित प्रश्न
Write down the name of a compound represented by the following formula:
Al2(SO4)3
Write down the name of a compound represented by the following formula:
K2SO4
Write down the name of a compound represented by the following formula:
CaCl2
Write down the name of a compound represented by the following formula:
KNO3
Give the name of the element present in the following compound:
Baking powder
Define: Atomic number
Define: Atomic number
Define: Mass number :
Define: Atomic weight :
What is the atomicity of the following ?
- Oxygen
- Ozone
- Neon
- Sulphur
- Phosphorus
- Sodium
What is the difference between the molecule of an element and the molecule of a compound ? Give one
example of each.
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 ?
Work out the formula for magnesium hydrogencarbonate.
What are (i) ionic compounds, and (ii) molecular compounds ? Give two examples of each type of compounds.
The cation of an element has :
Molecular compounds are usually formed by the combination between :
An element A forms an oxide A2O5.
What is the valency of element A ?
Give one example of a triatomic molecule
Give one example of a polyatomic molecule.
State the main points of the contradiction of Dalton’s atomic theory by the Modern Atomic Theory.
Give a reason why –
Ozone is considered triatomic, but phosphorus a tetratomic molecule.
State the atomicity of the following:
Neon
State the atomicity of the following:
Sulphur
If a molecule is made of similar kinds of atoms, then it is called ______ atomic molecule.
The Atomicity of phosphorous is ______
