Atomic Structure MCQs Class-8 Dalal Simplified ICSE Chemistry Solutions Chapter-4

Atomic Structure MCQs Class-8 Dalal Simplified ICSE Chemistry Solutions Chapter-4, Atomic Structure Dr Viraf J Dalal Middle School Allied Publishers Solutions. Chapter-4. We Provide Step by Step Solutions to Match the following, Correct answer, State the following of Dr Viraf J Dalal Middle School Chemistry Allied Publishers. Visit official Website CISCE for detail information about ICSE Board Class-8.

Atomic Structure MCQs Class-8 Dalal Simplified ICSE Chemistry Solutions Chapter-4

Board ICSE
Class 8th
Subject Chemistry
Book Name Dalal New Simplified
Chapter-4 Atomic Structure
Unit-1 Atomic Structure
Topic Solution of exercise MCQs
Session 2023-24

Objective Types Questions

Atomic Structure MCQs Class-8 Dalal Simplified ICSE Chemistry Solutions Chapter-4

Question: 1. Match the statements in List I with the correct answer from List II.

List I List II
1. Mass number of an atom is the number of protons and A: Electron
2. The subatomic particles with negligible mass B: Argon
3. An atom have stable electronic configuration C: Nitrogen
4. A molecule formed by sharing of electrons (covalency) D: Sodium
5. A metallic atom have unstable electronic configuration E: Neutrons

 

Answer: 

List I List II
1. Mass number of an atom is the number of protons and A: Neutrons
2. The subatomic particles with negligible mass B: Electron
3. An atom have stable electronic configuration C: Argon
4. A molecule formed by sharing of electrons (covalency) D: Nitrogen
5. A metallic atom have unstable electronic configuration E: Sodium

Question: 2. Select the correct answer from the choice in bracket to complete each sentence :

1. An element ‘X’ has six electrons in its outer or valence shell. Its valency is_ -2 _ (+2 / -2 / -1)

2. An element ‘Y’ has electronic configuration 2, 8, 6. The element ‘Y’ is a __non-metal__ (metal/ non-metal/ noble gas)

3. A __neutron__ (proton/neutron) is a sub-atomic particle with no charge and unit mass.

4. An element Z with zero valency is a __noble gas__ (metal / noble gas/ non-metal )

5. Magnesium atom with electronic configuration 2, 8, 2 achieves stable electronic configuration by losing two electrons, thereby achieving stable electronic configuration of the nearest noble gas __neon__ (neon/argon)

Question: 3. The diagram represents an isotope of hydrogen [H]. Answer the following:

Hydrogen [H] diagram

 
 
 
 
 
 
 
 
 
 
 
1. Are isotopes atoms of the same element or different elements?
2. Do isotopes have the same atomic number or the same mass number?
3. If an isotope of ‘H’ has mass no. = 2, how many electrons does it have?
4. If an isotope of ‘H’ has mass no. = 3, how many neutrons does it have?
5. Which subatomic particles in the 3 isotopes of ‘H’ are the same?

Answer: 

1. Isotopes are atoms of the same element.

2. Same atomic number

3. One electron

4. Two neutrons (A= P + n)

5. Protons and electrons in each isotope are the same.

Question: 4. State the electronic configuration for each of the following:

1. Hydrogen [p = 1].

2. Boron [p = 5]
3. Nitrogen [p = 7].
4. Neon [p = 10]
5. Magnesium [p = 12].
6. Aluminum [p = 13].
7. Sulphur [p = 16].
8. Argon [p = 18].
9. Potassium [p = 19].
10. Calcium [p = 20].

Answer: 

1. Hydrogen – (K) – (1)

2. Boron – (K, L) – (2, 3)

3. Nitrogen – (K, L) – (2, 5)

4. Neon – (K, L) – (2, 8)

5. Magnesium – (K, L, M) – (2, 8, 2)

6. Aluminum – (K, L, M) – (2, 8, 3)

7. Sulphur – (K, L, M) – (2, 8, 8)

8. Argon – (K, L, M, N) – (2, 8, 8, 2)

9. Potassium – (K, L, M, N) – (2, 8, 8, 3)

10. Calcium – (K, L, M, N) – (2, 8, 8, 4)

Question: 5. Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electrons :

1. Lithium [At. no. = 3, Mass no. = 7]
2. Carbon [At. no. = 6, Mass no. = 12]
3. Silicon [At. no. = 14, Mass no. = 28]
4. Sodium [At. no. = 11, Mass no. = 23]
5. Isotopes of hydrogen [11H, 21H , 31H]

Answer: 

1. Lithium [At. no. = 3, Mass no. = 7]

Lithium [At. no. = 3, Mass no. = 7]

2. Carbon [At. no. = 6, Mass no. = 12]

Carbon [At. no. = 6, Mass no. = 12]

3. Silicon [At. no. = 14, Mass no. = 28]

Silicon [At. no. 14, Mass no. = 28]

4. Sodium [At. no. = 11, Mass no. = 23]

Sodium [At. no. = 11, Mass no. = 23]

5. Isotopes of hydrogen [11H, 21H , 31H]

Isotopes of hydrogen [11H, 12H, 13H]

– : End of Atomic Structure MCQs Class-8 Dalal Simplified ICSE Chemistry Solutions Chapter-4 :–

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