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प्रश्न
State one major difference between covalent and ionic bonds and give one example each of covalent and ionic compounds.
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उत्तर
Covalent compounds have usually low melting points and boiling points. But ionic compounds have high melting points and boiling points.
An example for a covalent compound is methane (CH4).
An example for an ionic compound is sodium chloride (NaCl).
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संबंधित प्रश्न
State the type of bonding in the following molecule.
Water
Name the following:
The property of element by virtue of which atoms of the element can link to each other in the form of a long chain or ring structure.
will CCl4 conduct electricity or not?
give reason for your choice.
State any two uses of diamond.
The electronic configurations of two elements A and B are given below:
| A | 2, 6 |
| B | 2, 8, 1 |
(a) What type of chemical bond is formed between the two atoms of A?
(b) What type of chemical bond will be formed between the atoms of A and B?
An element E exists in three allotropic forms A, B and C. In allotrope A, the atoms of element E are joined to form spherical molecules. In allotrope B, each atom of element E is surrounded by three other E atoms to form a sheet like structure. In allotrope C, each atom of element E is surrounded by four other E atoms to form a rigid structure.
(a) Name the element E.
(b) What is allotrope A.
(c) What is allotrope B?
(d) What is allotrope C?
(e) Which allotrope is used in making jewellery?
(f) Which allotrope is used in making anode of a dry cell?
Draw an electron dot structure of the following molecule. (Without showing the circle) :
Ethene
Draw an electron dot structure of the following molecule. (Without showing the circle) :
Methanol
Explain the following term with example.
Alkane
(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
The particles present in strong electrolytes are
Fill in the blank from the choice given in bracket.
The compound that does not have a lone pair of electrons is ___________. (Water, Ammonia, carbon tetrachloride)
State the type of bond formed when the combining atom has small E.N. difference.
Element A has 2 electrons in its M shell. Element B has atomic number 7.
If the compound formed between A and B is melted and an electric current is passed through the molten compound, the element A will be obtained at the ______ and B at the ______ of the electrolytic cell.
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
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Give an example for each of the following statement.
Formation of coordinate covalent bond between NH3 ➝ BF3 molecules
The correct structural formula of butanoic acid is
The table shows the electronic structures of four elements.
| Element | Electronic Structure |
| P | 2, 6 |
| Q | 2, 8, 1 |
| R | 2, 8, 7 |
| S | 2, 8, 8 |
- Identify which element(s) will form covalent bonds with carbon.
- “Carbon reacts with an element in the above table to form several compounds.” Give suitable reason.
State the reasons, why carbon cannot
- Lose four electrons to form C4+ cation and
- Gain four electrons to form C4- anion.
How does carbon overcome this problem to form compounds?
Explain dipole (polar) molecule by taking hydrogen chloride as an example.
