Question

Which of the following pairs have dissimilar chemical properties?

• A. Sodium ($\text{Na}$) and potassium ($\text{K}$)
• B. Barium ($\text{Ba}$) and strontium ($\text{Sr}$)
• C. Zirconium ($\text{Zr}$) and hafnium ($\text{Hf}$)
• D. Calcium ($\text{Ca}$) and copper($\text{Cu}$)

Answer 1

The correct option is D Calcium ($\text{Ca}$) and copper($\text{Cu}$)

Elements placed in the same group have similar chemical properties. The modern periodic table is given below:


From the table and given options, we can see that calcium ($\text{Ca}$) and copper ($\text{Cu}$) is the only pair which is present in different groups of the modern periodic table. Hence, they are chemically dissimilar or possess different chemical properties.