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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