NIOS Class 10 Science and Technology Chapter 7: CHEMICAL BONDING– Chapter-wise Important Questions and Answers
NIOS Class 10 Science and Technology Chapter 7: CHEMICAL BONDING | MCQs, Short & Long Answer Questions | 7: CHEMICAL BONDING
Chapter 7: CHEMICAL BONDING
INTEXT QUESTIONS 7.1
1. State octet rule
Answer: The octet rule states that, atoms tend to gain, lose, or share electrons to achieve a stable outer shell containing 8 electrons (an octet), similar to the electronic configuration of noble gases.
2. Why noble gases are non-reactive?
Answer: Noble gases are non-reactive because they have a completely filled outermost electron shell (stable octet). Due to this stable electronic configuration, they do not easily gain, lose, or share electrons with other atoms.
3. In the table given below three elements and their atomic numbers are given. Which of them are stable and will not form compound?
|
Elements |
Atomic number |
Stable/Unstable |
|
A B C |
10 36 37 |
|
Answer:
|
Elements |
Atomic number |
Configuration |
Stable/Unstable |
|
A |
10 |
2.8 |
Stable |
|
B |
36 |
2.8.18.8 |
Stable |
|
C |
37 |
2.8.18.8.1 |
Unstable |
INTEXT QUESTIONS 7.2
1. Name the two types of ions present in NaCl.
Answer: Sodium ion Na⁺ (cation) and chloride ion Cl⁻ (anion) .
2. How many shells are present in Na+
ion?
Answer: Atomic number of sodium (Na) is 11 .
The electronic configuration of Na is 2. 8. 1 .
K L M
When it loses one electron to form Na⁺, the configuration becomes 2 . 8 .
K L
Therefore, Na⁺ ion has 2 shells (K and L shells).
3. What is the number of electrons present in Cl-
ion?
Answer: Atomic number chlorine 17.
The electronic configuration of Cl is 2. 8. 7 .
When it gains 1 electron to form Cl⁻, the total becomes = 17 + 1 = 18 electrons
So, Cl⁻ ion has 18 electrons.
4. Name the type of force of attraction present in ionic compounds.
Answer: The force of attraction present in ionic compounds is electrostatic force of attraction between positively charged ions (cations) and negatively charged ions (anions).
5. In sodium chloride lattice, how many Cl-
ions surround each Na+ ion?
Answer: In a sodium chloride (NaCl) lattice, each Na⁺ ion is surrounded by 6 Cl⁻ ions.
So, 6 chloride ions (Cl⁻).
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