Advertisements
Advertisements
प्रश्न
Give a reason why –
Helium is considered monoatomic, but hydrogen a diatomic molecule.
उत्तर
Helium (He) is considered monoatomic because it contains one atom while hydrogen contains two-atom (H2) therefore it considered as a diatomic molecule.
APPEARS IN
संबंधित प्रश्न
Write down the name of a compound represented by the following formula:
CaCl2
Give the name of the element present in the following compound:
Quick lime
Give the name of the element present in the following compound:
Baking powder
Give the name of the element present in the following compound:
Potassium sulphate
Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.
Define: Atomic number
Define: Atomic number
What is the atomicity of the following ?
- Oxygen
- Ozone
- Neon
- Sulphur
- Phosphorus
- Sodium
In what form does oxygen gas occur in nature ?
In what form do noble gases occur in nature?
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.
The cation of an element has :
An element A forms an oxide A2O5.
What is the valency of element A ?
Correct the following statement:
A molecule of sulphur is monoatomic.
Give one example of a triatomic molecule
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:
Chlorine
State the atomicity of the following:
Argon
Classify the following molecules as the molecules of element or compound
| 1. |  |
|
| 2. |  |
|
| 3. |  |
|
| 4. |  |
Two elements sometimes can form more than one compound.
Define: Atomicity.
Which of the following contains maximum number of molecules?
