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NEET 2025 Chemistry Probable Questions Answers - Classification of Elements and Periodicity Test4

1. Which of the following oxides is the most acidic?

Na2O
MgO
Al2O3
P4O10
2. The first ionization energy generally increases across a period because of which factor?
Increase in atomic radius
Decrease in atomic radius
Decrease in nuclear charge
Increase in electron shielding
3. Which of the following has the highest electronegativity?
C
N
O
F
4. Which of the following pairs of elements will have the same chemical properties?
Na and K
Ca and Sr
Cl and Br
All of these
5. The element with the highest oxidation state in the third period is
Na
Si
Cl
S
6. Which transition metal has the highest density?
Fe
Os
Ir
W
7. Which of the following elements shows diagonal relationship with Lithium?
Be
Mg
B
Na
8. The ionization energy of which of the following elements is the highest?
Be
B
C
N
9. Which of the following species is iso-electronic with Ne?
F+
Na+
O2-
Mg2+
10. Which of the following elements has the largest ionic radius?
Na+
Mg2+
K+
Ca2+






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