Advertisements
Advertisements
प्रश्न
State any two uses of diamond.
Advertisements
उत्तर
Uses of diamonds:
(1) As diamonds have an extraordinary shine, they are used in making jewellery.
(2) Diamonds, due to their hardness, are used in instruments like glass cutters, grinders. They are also used as abrasives for polishing.
APPEARS IN
संबंधित प्रश्न
An element L consists of molecules.
What type of bonding is present in the particles that make up L?
What type of bonds are present in CH4 molecule? Draw their electron-dot structures.
Using electron-dot diagrams which show only the outermost shell electrons, show how a molecule of oxygen, O2, is formed from two oxygen atoms. What name is given to this type of bonding? (At. No. of oxygen = 8)
The atomic numbers of four elements P, Q, R and S are 6, 10, 12 and 17 respectively. Which two elements can combine to form a covalent compound?
(a) P and R
(b) Q and S
(c) P and S
(d) R and S
The number of carbon atoms joined in a spherical molecule of buckminsterfullerene is:
(a) fifty
(b) sixty
(c) seventy
(d) ninety
What happens when methane (natural gas) burns in air? Write the chemical equation of the reaction involved.
State the type of bonding in the following molecule.
Hydroxyl ion
Draw an electron dot structure of the following molecule. (Without showing the circle) :
Methane
Draw an electron dot structure of the following molecule. (Without showing the circle) :
Ethene
Explain the following briefly:
Cl2 is a non polar molecule, while HCl is a polar molecule.
(a) Compound X consists of molecules.
Choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d) given below
In the liquid state, X will
In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compound?
The following table shows the electronic configuration of the elements W, X, Y, Z:
|
Element |
W |
X |
Y |
Z |
|
Electronic |
2,8,1 |
2,8,7 |
2,5 |
1 |
Answer the following questions based on the table above:
What type of bond is formed between Y and Z.
Compound X consists of molecules.
Choose the letter corresponding to the correct answer from the options A, B, C and D given below:
The type of bonding in X will be ______.
Explain the following:
Water is a polar covalent molecule.
Element A has 2 electrons in its M shell. Element B has atomic number 7.
If B is a diatomic gas, write the equation for the direct combination of A and B to form a compound.
From the following hydrocarbon _______ is the cyclic hydrocarbon.
Write the molecular formula of the given compound.
Propylene
Considering MgCl2 as ionic compound and CH4 as covalent compound give any two differences between these two compounds.
Mineral acids are stronger acids than carboxylic acids because
- mineral acids are completely ionised
- carboxylic acids are completely ionised
- mineral acids are partially ionised
- carboxylic acids are partially ionised
