Here we are going to provide class 12 chemistry chapter 9 periodic classification solved mcqs that helps Sindh board students in their exam.
12 Class Chemistry Chapter 9 MCQs with Answers
This 2nd year’s chemistry chapter 9 Sindh board mcqs are also helpful for Karachi, Hyderabad, Larkana, and Sukkur board students in their examination preparation
1. In the modern periodic table, the number of periods of the element is the same as:
a) principal quantum number
b) atomic number
c) azimuthal quantum number
d) atomic mass
Answer: a) principal quantum number
2. Which one is the most acidic among these
a) MgO
b) CaO
c) AI2O3
d) Na2O
Answer: c) AI2O3
3. In the periodic table, helium is placed at:
a) top left corner
b) bottom right corner
c) bottom left corner
d) top right corner
Answer: d) top right corner
4. Across the period the atomic size decreases due to:
a) shielding effect
b) photoelectric effect
c) increase in nuclear force of attraction
d) decrease in nuclear force of attraction
Answer: c) increase in nuclear force of attraction
5. The first three periods are:
a) long periods
b) short periods
c) moderate periods
d) all of above
Answer: b) short periods
6. Both elements of 1st period contain valence electrons in:
a) M shell
b) N shell
c) K shell
d) S shell
Answer: c) K shell
7. On basis of electronic configuration, the group and period of 95B is:
a) 2 and IIIA
b) 3 and IIA
c) 4 and VIA
d) 5 and VIIA
Answer: a) 2 and IIIA
8. A shell also contains of __________
a) Subshells
b) Orbitals
c) Both of the above
d) None of the above
Answer: c) Both of the above
9. Energy levels are represented by ________
a) n
b) M
c) L
d) K
Answer: a) n
10. Which one has the lowest energy
a) K-shell
b) L-shell
c) M-shell
d) N-shell
Answer: a) K-shell
11. Fourth energy level or N has ________ subshells.
a) s
b) p
c) s, p
d) s, p, d, f
Answer: d) s, p, d, f
12. Second energy level or L shell has _____ subshells.
a) s
b) p
c) s, p
d) s, p, d, f
Answer: c) s, p
Conclusion
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