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Which of the following are correct about...

Which of the following are correct about Zn,Cd,Hg
I) They exhibit enthalpy of atomisation as the d-subshell is full
II) Zn,Cd do not show variable oxidation states, Hg can show +1,+2 states
III) Compounds of `Zn,Cd,Hg` are paramagnetic
IV) They are soft metals

A

I, II, III

B

I, III

C

II, IV

D

IV only

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements about Zinc (Zn), Cadmium (Cd), and Mercury (Hg) are correct, we will analyze each statement one by one. ### Step 1: Analyze Statement I **Statement I:** They exhibit enthalpy of atomisation as the d-subshell is full. - **Analysis:** Zinc, cadmium, and mercury have completely filled d-subshells (d10 configuration). However, this does not directly imply that they exhibit high enthalpy of atomization. In fact, they have low enthalpy of atomization due to the stability provided by the filled d-subshell. Thus, this statement is **incorrect**. ### Step 2: Analyze Statement II **Statement II:** Zn, Cd do not show variable oxidation states; Hg can show +1, +2 states. - **Analysis:** Zinc (Zn) and Cadmium (Cd) primarily exhibit a +2 oxidation state and do not show variable oxidation states. Mercury (Hg), however, can exhibit +1 and +2 oxidation states. Therefore, this statement is **correct**. ### Step 3: Analyze Statement III **Statement III:** Compounds of Zn, Cd, Hg are paramagnetic. - **Analysis:** Compounds of Zn, Cd, and Hg generally have all their electrons paired, which means they are **diamagnetic** rather than paramagnetic. Therefore, this statement is **incorrect**. ### Step 4: Analyze Statement IV **Statement IV:** They are soft metals. - **Analysis:** Zinc, cadmium, and mercury are indeed considered soft metals. This is due to their electronic configuration and the nature of their metallic bonding. Therefore, this statement is **correct**. ### Conclusion Based on the analysis: - Statement I: Incorrect - Statement II: Correct - Statement III: Incorrect - Statement IV: Correct Thus, the correct statements about Zn, Cd, and Hg are **II and IV**. ### Summary of Correct Statements: - **II:** Zn, Cd do not show variable oxidation states; Hg can show +1, +2 states. - **IV:** They are soft metals.
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